10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)
þ	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended September 30, 2017
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from                        to

Commission File Number	Exact Name of Registrant as specified in its charter	State or Other Jurisdiction of Incorporation or Organization	IRS Employer Identification Number
1-9936	EDISON INTERNATIONAL	California	95-4137452
1-2313	SOUTHERN CALIFORNIA EDISON COMPANY	California	95-1240335

EDISON INTERNATIONAL	SOUTHERN CALIFORNIA EDISON COMPANY
2244 Walnut Grove Avenue (P.O. Box 976) Rosemead, California 91770 (Address of principal executive offices)	2244 Walnut Grove Avenue (P.O. Box 800) Rosemead, California 91770 (Address of principal executive offices)
(626) 302-2222 (Registrant's telephone number, including area code)	(626) 302-1212 (Registrant's telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Edison International        Yes þ No oSouthern California Edison Company    Yes þ No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Edison International        Yes þ No oSouthern California Edison Company    Yes þ No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-12 of the Exchange Act. (Check One):
Edison International	Large Accelerated Filer þ	Accelerated Filer ¨	Non-accelerated Filer ¨	Smaller Reporting Company ¨	Emerging growth company ¨
Southern California Edison Company	Large Accelerated Filer ¨	Accelerated Filer ¨	Non-accelerated Filer þ	Smaller Reporting Company ¨	Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
Edison International	¨	Southern California Edison Company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Edison International        Yes ¨ No þSouthern California Edison Company    Yes ¨ No þ

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date:

Common Stock outstanding as of October 27, 2017:
Edison International	325,811,206 shares
Southern California Edison Company	434,888,104 shares

TABLE OF CONTENTS

					SEC Form 10-Q Reference Number
GLOSSARY				iii
FORWARD-LOOKING STATEMENTS				1
MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS				3	Part I, Item 2
	MANAGEMENT OVERVIEW			3
		Highlights of Operating Results		3
		Capital Program		4
		Regulatory Proceedings		5
	RESULTS OF OPERATIONS			7
	Southern California Edison Company			7
		Three months ended September 30, 2017 versus September 30, 2016		8
			Earning Activities	8
			Cost-Recovery Activities	9
		Nine months ended September 30, 2017 versus September 30, 2016		9
			Earning Activities	9
			Cost-Recovery Activities	10
	Supplemental Operating Revenue Information			11
	Income Taxes			11
	Edison International Parent and Other			11
		Strategic Review of Edison Energy Group Competitive Businesses		11
		Income from Continuing Operations		12
	LIQUIDITY AND CAPITAL RESOURCES			12
	Southern California Edison Company			12
		Available Liquidity		12
		Capital Investment Plan		13
		Dividend Restrictions		14
		Margin and Collateral Deposits		14
	Edison International Parent and Other			14
	Historical Cash Flows			15
		Southern California Edison Company		15
		Edison International Parent and Other		18
	Contingencies			18
	MARKET RISK EXPOSURES			18
	Commodity Price Risk			19
	Credit Risk			19
	CRITICAL ACCOUNTING ESTIMATES AND POLICIES			19
	NEW ACCOUNTING GUIDANCE			19
QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK				19	Part I, Item 3
FINANCIAL STATEMENTS				20	Part I, Item 1
	Edison International Consolidated Statements of Income			20
	Edison International Consolidated Statements of Comprehensive Income			21

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	Edison International Consolidated Balance Sheets		22
	Edison International Consolidated Statements of Cash Flows		24
	SCE Consolidated Statements of Income		25
	SCE Consolidated Statements of Comprehensive Income		25
	SCE Consolidated Balance Sheets		26
	SCE Consolidated Statements of Cash Flows		28
	NOTES TO CONSOLIDATED FINANCIAL STATEMENTS		29
		Note 1. Summary of Significant Accounting Policies	29
		Note 2. Consolidated Statements of Changes in Equity	32
		Note 3. Variable Interest Entities	34
		Note 4. Fair Value Measurements	36
		Note 5. Debt and Credit Agreements	40
		Note 6. Derivative Instruments	41
		Note 7. Income Taxes	43
		Note 8. Compensation and Benefit Plans	44
		Note 9. Investments	46
		Note 10. Regulatory Assets and Liabilities	47
		Note 11. Commitments and Contingencies	49
		Note 12. Preferred and Preference Stock of SCE	53
		Note 13. Accumulated Other Comprehensive Loss	53
		Note 14. Interest and Other Income and Other Expenses	54
		Note 15. Supplemental Cash Flows Information	54
CONTROLS AND PROCEDURES			55	Part I, Item 4
	Disclosure Controls and Procedures		55
	Changes in Internal Control Over Financial Reporting		55
	Jointly Owned Utility Plant		55
LEGAL PROCEEDINGS			55	Part II, Item 1
UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS			56	Part II, Item 2
	Purchases of Equity Securities by Edison International and Affiliated Purchasers		56
	Purchases of Equity Securities by SCE and Affiliated Purchasers		56
EXHIBITS			57	Part II, Item 6
SIGNATURES			58

This is a combined Form 10-Q separately filed by Edison International and Southern California Edison Company. Information contained herein relating to an individual company is filed by such company on its own behalf. Each company makes representations only as to itself and makes no other representation whatsoever as to any other company.

ii

GLOSSARY

The following terms and abbreviations appearing in the text of this report have the meanings indicated below.

2016 Form 10-K	Edison International's and SCE's combined Annual Report on Form 10-K for the year-ended December 31, 2016
AFUDC	allowance for funds used during construction
ALJ	administrative law judge
ARO(s)	asset retirement obligation(s)
Bcf	billion cubic feet
Bonus Depreciation	Current federal tax deduction of a percentage of the qualifying property placed in service during periods permitted under tax laws
BRRBA	Base Revenue Requirement Balancing Account
CAISO	California Independent System Operator
CPUC	California Public Utilities Commission
DERs	distributed energy resources
DOE	U.S. Department of Energy
DRP	Distributed Resources Plan
Edison Energy	Edison Energy, LLC, a wholly-owned subsidiary of Edison Energy Group that advises and provides energy solutions to large energy users
Edison Energy Group	Edison Energy Group, Inc., the holding company for subsidiaries engaged in competitive businesses focused on providing energy services, managed portfolio solutions, and distributed solar solutions to commercial and industrial customers
EME	Edison Mission Energy
EMG	Edison Mission Group Inc., a wholly owned subsidiary of Edison International and the parent company of EME and Edison Capital
ERRA	energy resource recovery account
FERC	Federal Energy Regulatory Commission
GAAP	generally accepted accounting principles used in the United States
GHG	greenhouse gas
GRC	general rate case
GWh	gigawatt-hours
HLBV	hypothetical liquidation at book value
IRS	Internal Revenue Service
Joint Proxy Statement	Edison International's and SCE's definitive Proxy Statement filed with the SEC in connection with Edison International's and SCE's Annual Shareholders' Meeting held on April 27, 2017
MD&A	Management's Discussion and Analysis of Financial Condition and Results of Operations in this report
MHI	Mitsubishi Heavy Industries, Inc. and related companies
MW	megawatts
MWdc	megawatts measured for solar projects representing the accumulated peak capacity of all the solar modules
NEIL	Nuclear Electric Insurance Limited
NEM	net energy metering
NERC	North American Electric Reliability Corporation
NRC	Nuclear Regulatory Commission
ORA	CPUC's Office of Ratepayers Advocates
OII	Order Instituting Investigation
Palo Verde	nuclear electric generating facility located near Phoenix, Arizona in which SCE holds a 15.8% ownership interest
PBOP(s)	postretirement benefits other than pension(s)
QF(s)	qualifying facility(ies)

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ROE	return on common equity
S&P	Standard & Poor's Ratings Services
San Onofre	retired nuclear generating facility located in south San Clemente, California in which SCE holds a 78.21% ownership interest
San Onofre OII Settlement Agreement	Settlement Agreement by and among SCE, TURN, ORA, SDG&E, the Coalition of California Utility Employees, and Friends of the Earth, dated November 20, 2014
SCE	Southern California Edison Company
SDG&E	San Diego Gas & Electric
SEC	U.S. Securities and Exchange Commission
SED	Safety and Enforcement Division of the CPUC, formerly known as the Consumer Protection and Safety Division or CPSD
SoCalGas	Southern California Gas Company
SoCore Energy	SoCore Energy LLC, a subsidiary of Edison Energy Group that provides solar energy and energy storage solutions
TURN	The Utility Reform Network
US EPA	U.S. Environmental Protection Agency

iv

FORWARD-LOOKING STATEMENTS

This quarterly report on Form 10-Q contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements reflect Edison International's and SCE's current expectations and projections about future events based on Edison International's and SCE's knowledge of present facts and circumstances and assumptions about future events and include any statements that do not directly relate to a historical or current fact. Other information distributed by Edison International and SCE that is incorporated in this report, or that refers to or incorporates this report, may also contain forward-looking statements. In this report and elsewhere, the words "expects," "believes," "anticipates," "estimates," "projects," "intends," "plans," "probable," "may," "will," "could," "would," "should," and variations of such words and similar expressions, or discussions of strategy or plans, are intended to identify forward-looking statements. Such statements necessarily involve risks and uncertainties that could cause actual results to differ materially from those anticipated. Some of the risks, uncertainties and other important factors that could cause results to differ from those currently expected, or that otherwise could impact Edison International and SCE, include, but are not limited to the:

• ability of SCE to recover its costs in a timely manner from its customers through regulated rates, including costs related to San Onofre, and proposed spending on grid modernization;

• decisions and other actions by the CPUC, the FERC, the NRC and other regulatory authorities, including determinations of authorized rates of return or return on equity, the outcome of San Onofre CPUC proceedings, and the 2018 GRC, and delays in regulatory actions;

• ability of Edison International or SCE to borrow funds and access the capital markets on reasonable terms;

• risks associated with cost allocation resulting in higher rates for utility bundled service customers, caused by the authority of cities, counties, and certain other public agencies to generate and/or purchase electricity for their local residents and businesses (known as Community Choice Aggregation or CCA), and other possible customer bypass or departure due to increased adoption of DERs or technological advancements in the generation, storage, transmission, distribution, and use of electricity, and supported by public policy, government regulations and incentives;

• risks inherent in SCE's transmission and distribution infrastructure investment program, including those related to project site identification, public opposition, environmental mitigation, construction, permitting, power curtailment costs (payments due under power contracts in the event there is insufficient transmission to enable acceptance of power delivery), and governmental approvals;

• risks associated with the operation of transmission and distribution assets and power generating facilities, including public safety issues, failure, availability, efficiency, and output of equipment and availability and cost of spare parts;

• risks associated with the decommissioning of San Onofre, including those related to public opposition, permitting, governmental approvals, on-site storage of spent nuclear fuel, and cost overruns;

• physical security of Edison International's and SCE's critical assets and personnel and the cybersecurity of Edison International's and SCE's critical information technology systems for grid control, and business and customer data;

• ability of Edison International to develop Edison Energy Group, manage new business risks and recover and earn a return on its investment in newly developed or acquired businesses;

• cost and availability of electricity, including the ability to procure sufficient resources to meet expected customer needs in the event of power plant outages or significant counterparty defaults under power purchase agreements;

• environmental laws and regulations, at both the state and federal levels, or changes in the application of those laws, that could require additional expenditures or otherwise affect the cost and manner of doing business;

• changes in tax laws and regulations, at both the state and federal levels, or changes in the application of those laws, that could affect recorded deferred tax assets and liabilities and effective tax rate;

• changes in the fair value of investments and other assets;

• changes in interest rates and rates of inflation, including escalation rates, which may be adjusted by public utility regulators;

• governmental, statutory, regulatory, or administrative changes or initiatives affecting the electricity industry, including the market structure rules applicable to each market adopted by the NERC, CAISO, Western Electricity Coordination Council, and similar regulatory bodies in adjoining regions;

1

• availability and creditworthiness of counterparties and the resulting effects on liquidity in the power and fuel markets and/or the ability of counterparties to pay amounts owed in excess of collateral provided in support of their obligations;

• cost and availability of labor, equipment, and materials;

• ability to obtain sufficient insurance, including insurance relating to SCE's nuclear facilities and wildfire-related liability, and to recover the costs of such insurance or in the absence of insurance the ability to recover uninsured losses;

• potential for penalties or disallowance for non-compliance with applicable laws and regulations;

• cost of fuel for generating facilities and related transportation, which could be impacted by, among other things, disruption of natural gas storage facilities, to the extent not recovered through regulated rate cost escalation provisions or balancing accounts;

• disruption of natural gas supply due to unavailability of storage facilities, which could lead to electricity service interruptions; and

• weather conditions and natural disasters.

Additional information about risks and uncertainties, including more detail about the factors described in this report, is contained throughout this report and in the 2016 Form 10-K, including the "Risk Factors" section. Readers are urged to read this entire report, including information incorporated by reference, as well as the 2016 Form 10-K, and carefully consider the risks, uncertainties, and other factors that affect Edison International's and SCE's businesses. Forward-looking statements speak only as of the date they are made and neither Edison International nor SCE are obligated to publicly update or revise forward-looking statements. Readers should review future reports filed by Edison International and SCE with the SEC. Edison International and SCE provide direct links to SCE's regulatory filings with the CPUC and the FERC and material agency rulings in open proceedings most important to investors at www.edisoninvestor.com (SCE Regulatory Highlights) so that such filings are available to all investors upon SCE filing with the relevant agency. Edison International and SCE also routinely post or provide direct links to presentations, documents and other information that may be of interest to investors at www.edisoninvestor.com (Events and Presentations) in order to publicly disseminate such information.

The MD&A for the nine months ended September 30, 2017 discusses material changes in the consolidated financial condition, results of operations and other developments of Edison International and SCE since December 31, 2016, and as compared to the nine months ended September 30, 2016. This discussion presumes that the reader has read or has access to Edison International's and SCE's MD&A for the calendar year 2016 (the "year-ended 2016 MD&A"), which was included in the 2016 Form 10-K.

Except when otherwise stated, references to each of Edison International, SCE, EMG, Edison Energy Group, EME or Edison Capital mean each such company with its subsidiaries on a consolidated basis. References to "Edison International Parent and Other" mean Edison International Parent and its consolidated competitive subsidiaries.

2

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

MANAGEMENT OVERVIEW

Highlights of Operating Results

Edison International is the parent holding company of SCE. SCE is a public utility primarily engaged in the business of supplying and delivering electricity to an approximately 50,000 square mile area of southern California. Edison International is also the parent company of Edison Energy Group, a holding company for subsidiaries engaged in pursuing competitive business opportunities across energy services, managed portfolio solutions, and distributed solar solutions to commercial and industrial customers. Such business activities are currently not material to report as a separate business segment. References to Edison International refer to the consolidated group of Edison International and its subsidiaries. References to Edison International Parent and Other refer to Edison International Parent and its competitive subsidiaries. Unless otherwise described, all the information contained in this report relates to both filers.

	Three months ended September 30,							Nine months ended September 30,
(in millions)	2017		20161			Change		2017			20161			Change
Net income (loss) attributable to Edison International
Continuing operations
SCE	$	465	$	435		$	30	$	1,121		$	1,048		$	73
Edison International Parent and Other	5		(14		)	19		(11		)	(65		)	54
Discontinued operations	—		—			—		—			(1		)	1
Edison International	470		421			49		1,110			982			128
Less: Non-core items
SCE	—		—			—		—			—			—
Edison International Parent and Other	—		—			—		1			5			(4		)
Discontinued operations	—		—			—		—			(1		)	1
Total non-core items	—		—			—		1			4			(3		)
Core earnings (losses)
SCE	465		435			30		1,121			1,048			73
Edison International Parent and Other	5		(14		)	19		(12		)	(70		)	58
Edison International	$	470	$	421		$	49	$	1,109		$	978		$	131

¹ The earnings for the three and nine months ended September 30, 2016 were updated to reflect the implementation of the accounting standard for share-based payments effective January 1, 2016. See "Notes to Consolidated Financial Statements—Note 1. Summary of Significant Accounting Policies" for further information.

Edison International's earnings are prepared in accordance with GAAP. Management uses core earnings internally for financial planning and for analysis of performance. Core earnings (losses) are also used when communicating with investors and analysts regarding Edison International's earnings results to facilitate comparisons of the company's performance from period to period. Core earnings (losses) are a non-GAAP financial measure and may not be comparable to those of other companies. Core earnings (losses) are defined as earnings attributable to Edison International shareholders less non-core items. Non-core items include income or loss from discontinued operations, income resulting from allocation of losses to tax equity investors under the HLBV accounting method, and income or loss from significant discrete items that management does not consider representative of ongoing earnings, such as exit activities, including sale of certain assets and other activities that are no longer continuing, write downs, asset impairments and other gains and losses related to certain tax, regulatory, or legal settlements or proceedings.

3

Edison International's third quarter 2017 earnings increased $49 million from the third quarter of 2016, comprised of an increase in SCE's earnings of $30 million and a decrease in Edison International Parent and Other's losses of $19 million. The increase in earnings at SCE was primarily due to the escalation mechanism set forth in the 2015 GRC decision.

Edison International's earnings for the nine months ended September 30, 2017 increased $128 million from the nine months ended September 30, 2016, comprised of an increase in SCE's earnings of $73 million, a decrease in Edison International Parent and Other's losses of $54 million, and a decrease in losses from discontinued operations of $1 million. The increase in earnings at SCE was primarily related to an increase in revenue from the escalation mechanism set forth in the 2015 GRC decision and lower operation and maintenance expenses, partially offset by a reduction in CPUC revenue related to prior overcollections and higher net financing costs.

Edison International Parent and Other's decrease in losses for the three and nine months ended September 30, 2017 was due to lower core losses of $19 million and $58 million, respectively, and lower non-core earnings of $4 million for the nine months ended September 30, 2017. The decrease in core losses for the quarter was due to higher income tax benefits resulting from net operating loss carrybacks from the filing of the 2016 tax returns in 2017. The year-to-date decrease also reflects higher income tax benefits related to stock option exercises and the 2017 settlement of federal income tax audits for 2007 – 2012.

Capital Program

SCE's capital expenditures forecast for the 2017 – 2020 period has been revised since the filing of the 2016 Form 10-K, as indicated in the table below. The update also reflects SCE's revised requested capital expenditures for 2018 – 2020 resulting from SCE's 2018 GRC rebuttal testimony, filed in June 2017.

The 2017 capital program had originally included expenditures of $182 million for grid modernization capital spending. SCE has requested CPUC approval of a memorandum account to facilitate recovery in rates of such expenditures. The memorandum account has not yet been approved by the CPUC and may not be approved. Certain of the grid modernization capital expenditures promote safety and reliability as well as facilitate integration of distributed energy resources and are the focus of SCE's reduced grid modernization capital expenditures in 2017. These expenditures are included in traditional distribution capital expenditures for 2017 in the table below.

Traditional capital expenditures for 2017 reflect SCE's forecast capital expenditures for CPUC and FERC capital projects. Traditional capital expenditures for 2018 – 2020 reflect the amounts requested in the 2018 GRC filing and subsequently updated in SCE's rebuttal testimony as well as the expected spending for FERC capital projects. Recovery for 2017 – 2020 planned expenditures for traditional capital projects under FERC jurisdiction will be pursued through FERC-authorized mechanisms. The CPUC has approved 81%, 89%, and 92% of the traditional capital expenditures requested in the 2009, 2012, and 2015 GRC decisions, respectively. While SCE cannot predict the level of traditional capital spending that will be approved in the 2018 GRC decision, management is not aware of factors that would cause the percentage of SCE's request that is ultimately approved to be materially different from what has been approved in recent GRC decisions. SCE does not have prior approval experience with grid modernization capital expenditures and, therefore, is unable to predict an expected outcome. Forecasted expenditures for FERC capital projects are subject to change due to timeliness of permitting, licensing and regulatory approvals. For further information regarding updates for large transmission and substation projects, see "Liquidity and Capital Resources—SCE—Capital Investment Plan."

It is unlikely that SCE will receive a 2018 GRC decision in 2017. It is also uncertain whether SCE will receive firm guidance on grid modernization spending as part of the DRP proceeding during 2017. SCE is currently developing an approach for 2018 capital spending, based on these contingencies, which will allow SCE to ramp up its capital spending program to meet the rate base ultimately authorized in the 2018 GRC decision while minimizing the associated risk of unauthorized spending. A component of this approach will be to focus initial 2018 grid modernization spending on capital that provides safety and reliability benefits while deferring most spending that is primarily focused on integration of distributed energy resources.

4

Total capital expenditures (including accruals) were $2.3 billion and $2.4 billion for the first nine months of 2017 and 2016, respectively. The following table sets forth a summary of forecasted capital expenditures for 2017 – 2020 on the basis described above:

(in millions)	2017		2018		2019		2020		Total 2017 – 2020
Traditional capital expenditures1
Distribution2	$	2,975	$	3,174	$	3,119	$	3,048	$	12,316
Transmission	500		956		1,003		1,046		3,505
Generation	205		220		212		201		838
Total requested traditional capital expenditures1, 3	$	3,680	$	4,350	$	4,334	$	4,295	$	16,659
Grid modernization capital expenditures2	$	—	$	538	$	649	$	608	$	1,795
Total capital expenditures	$	3,680	$	4,888	$	4,983	$	4,903	$	18,454

¹ Includes Energy Storage of $60 million in the 2017 – 2020 period. Also, includes $12 million Charge Ready Pilot in 2017.

² 2017 capital expenditures related to grid modernization are included in traditional distribution capital expenditures.

³  Capital expenditures for 2017 reflect management's expectations based on the 2015 GRC decision.

SCE's estimated weighted average annual rate base for 2017 – 2020 using the capital expenditures set forth in the table above is as follows:

(in millions)	2017		2018		2019		2020
Rate base for requested traditional capital expenditures	$	26,133	$	28,947	$	31,040	$	33,076
Rate base for requested grid modernization capital expenditures	—		261		695		1,195
Total rate base	$	26,133	$	29,208	$	31,735	$	34,271

The rate base above does not reflect reductions from the amounts requested in the 2018 GRC that may be included in a final decision.

Regulatory Proceedings

2018 General Rate Case

In September 2016, SCE filed its 2018 GRC application for the three-year period 2018 – 2020, which requested a 2018 revenue requirement of $5.885 billion, an increase of $222 million over the projected 2017 GRC authorized revenue requirement. In June 2017 in its rebuttal testimony, SCE revised its requested 2018 revenue requirement to $5.859 billion, which would be a $196 million increase. The rebuttal testimony also proposed post-test year increases in 2019 and 2020 of $480 million and $556 million, respectively.

In April 2017, the ORA recommended that SCE's original requested 2018 base revenue requirement be decreased by approximately $208 million, comprised of approximately $164 million in operations and maintenance expense reductions and approximately $44 million in capital-related revenue requirement reductions largely related to the proposed reduction of 100% of grid modernization capital spending. To the extent any spending is authorized, the ORA proposed capturing grid modernization spending in a memorandum account for review in the 2021 GRC. TURN recommended reductions of 78% of grid modernization capital expenditures in 2018 and initially recommended adjustments to rate base for historical capital expenditures, including a reduction of $700 million, primarily related to certain distribution infrastructure replacement programs. In a September 2017 filing, TURN reduced their recommended rate base adjustment to approximately $550 million. The impact of TURN's updated recommendations would decrease SCE's original requested 2018 base revenue requirement by approximately $114 million.

Public participation hearings are scheduled in mid-November and update filings are due in early December. While SCE requested that the CPUC issue a final decision by the end of 2017, it is unlikely that such timing will be achieved. If the schedule for a final decision is delayed, SCE will request the CPUC to issue an order directing that the authorized revenue requirement changes be effective January 1, 2018. SCE cannot predict the revenue requirement the CPUC will ultimately authorize for 2018 through 2020 or forecast the timing of a final decision.

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Permanent Retirement of San Onofre

Replacement steam generators were installed at San Onofre in 2010 and 2011. On January 31, 2012, a leak suddenly occurred in one of the heat transfer tubes in San Onofre's Unit 3 steam generators. The Unit was safely taken off-line and subsequent inspections revealed excessive tube wear. Unit 2 was off-line for a planned outage when areas of unexpected tube wear were also discovered. On June 6, 2013, SCE decided to permanently retire Units 2 and 3.

San Onofre CPUC Proceedings

As discussed in the year-ended 2016 MD&A, in a December 2016 joint ruling, the Assigned Commissioner and the Assigned ALJ expressed concerns about the extent to which the failure to timely report ex parte communications had impacted the settlement negotiations and directed SCE and SDG&E to meet and confer with the other parties in the San Onofre OII to consider changing the terms of the San Onofre OII Settlement Agreement. In March 2017, SCE and the parties participating in the meet-and-confer process initiated a mediation of the issues identified in the December 2016 joint ruling. On August 15, 2017, SCE notified the CPUC that the parties in the San Onofre OII Settlement Agreement were unable to reach agreement on possible changes to the settlement unanimously approved by the CPUC in 2014. In connection with the termination of the meet-and-confer process, SCE asked the CPUC to affirm that the San Onofre OII Settlement Agreement is fair, reasonable and in the public interest. Other parties to the meet-and-confer process petitioned the CPUC on a broad range of litigation positions, certain of which included substantial additional disallowances.

On October 10, 2017, the Assigned Commissioner and ALJ issued a Ruling ordering additional process to resolve the San Onofre OII. The Ruling did not set aside nor confirm the San Onofre OII Settlement Agreement but stated that the CPUC required an additional record to address the appropriate cost allocation for the premature shutdown of San Onofre Units 2 and 3, in the event the CPUC decides that the settlement does not meet the CPUC's standards for approval of settlements. The Ruling sets an expedited schedule with a status conference on November 7, 2017 and hearings tentatively scheduled to end in March 2018. The CPUC has not announced the expected timing for a decision.

SCE has recorded a regulatory asset of $730 million at September 30, 2017 to reflect the expected recoveries under the San Onofre OII Settlement Agreement. SCE assessed the San Onofre regulatory asset at September 30, 2017 and continues to conclude that the asset is probable, though not certain, of recovery based on SCE's knowledge of facts and judgment in applying the relevant regulatory principles to the issue. Such judgment is subject to uncertainty, and regulatory principles and precedents are not necessarily binding and are subject to interpretation.

MHI Claims

In March 2017, SCE received a decision from the International Chamber of Commerce International Court of Arbitration on claims against MHI regarding failure of the replacement steam generators that MHI supplied for San Onofre. The net recovery awarded to SCE was initially determined to be $52 million. An adjustment to the interest awarded to SCE subsequently reduced the net recovery to $47 million. As a result of uncertainty associated with the allocation of the award under the San Onofre OII Settlement Agreement, SCE recorded a regulatory liability for the net recovery.

For more information on the challenges to the settlement of the San Onofre OII, the arbitration tribunal decision on MHI, and the San Onofre regulatory asset, see "Notes to Consolidated Financial Statements—Note 11. Commitments and Contingencies—Contingencies—San Onofre Related Matters."

Cost of Capital

In July 2017, the CPUC issued a final decision that adopted the petition previously filed by SCE, Pacific Gas & Electric Company, SDG&E, and SoCalGas (collectively, the "Investor-Owned Utilities"), ORA, and TURN to modify the prior CPUC decisions addressing the Investor-Owned Utilities' costs of capital. The decision extended the deadline for the next Investor-Owned Utilities cost of capital application to April 2019, reset SCE's authorized cost of long-term debt and preferred stock, and established SCE's authorized ROE at 10.30%, both beginning January 1, 2018. In October 2017, the CPUC approved SCE's updated debt and preferred rates that SCE filed in September 2017. For more information on the terms of the settling parties' petition, see "Management Overview—Regulatory Proceedings—Cost of Capital" in the year-ended 2016 MD&A.

6

FERC Formula Rates

In October 2017, SCE filed its 2018 annual update with the FERC with rates effective January 1, 2018. The update reflected a decrease in SCE's transmission revenue requirement of $13 million or 1.1% lower than amounts currently authorized in rates due to lower undercollections in previous periods. In addition, SCE filed its new formula rate with the FERC in October 2017 resulting in an additional decrease to the 2018 annual update of $6 million or 0.5%. Once the new formula rate is accepted by the FERC, it will supersede the existing formula rate, including the 2018 annual update, and could become effective as early as January 1, 2018. FERC has the authority and may suspend new rates for up to five months. If the new formula rate is suspended by the FERC, the 2018 transmission revenue requirement rate established in the 2018 annual update will be effective from January 1, 2018 until the end of the suspension of the new formula rate. The new formula rate will be subject to refund from the end of the suspension until it is ultimately approved by the FERC.

Power Charge Indifference Adjustment Rulemaking

In September 2017, the CPUC issued a Scoping Memo for its rulemaking to review, revise, and consider alternatives to the Power Charge Indifference Adjustment ("PCIA"), which is a charge that is applied to departing load customers and is intended to maintain bundled service customer indifference to departing load (including Community Choice Aggregator or CCA formation). The Scoping Memo adopts an overall goal of implementing the existing California statutory requirements regarding customer indifference for the proceeding. The CPUC has adopted a schedule with an expected resolution by the third quarter of 2018.

RESULTS OF OPERATIONS

Southern California Edison Company

SCE's results of operations are derived mainly through two sources:

• Earning activities – representing revenue authorized by the CPUC and FERC which is intended to provide SCE a reasonable opportunity to recover its costs and earn a return on its net investment in generation, transmission, and distribution assets. The annual revenue requirements are comprised of authorized operation and maintenance costs, depreciation, taxes, and a return consistent with the capital structure. Also, included in earnings activities are revenues or penalties related to incentive mechanisms, other operating revenue, and regulatory charges or disallowances.

• Cost-recovery activities – representing CPUC- and FERC- authorized balancing accounts which allow for recovery of specific project or program costs, subject to reasonableness review or compliance with upfront standards. Cost-recovery activities include rates which provide recovery, subject to reasonableness review of, among other things, fuel costs, purchased power costs, public purpose related-program costs (including energy efficiency and demand-side management programs), and certain operation and maintenance expenses. SCE earns no return on these activities.

7

The following table is a summary of SCE's results of operations for the periods indicated.

Three months ended September 30, 2017 versus September 30, 2016

	Three months ended September 30, 2017									Three months ended September 30, 2016
(in millions)	Earning Activities			Cost- Recovery Activities			Total Consolidated			Earning Activities			Cost- Recovery Activities			Total Consolidated
Operating revenue	$	1,677		$	1,975		$	3,652		$	1,811		$	1,941		$	3,752
Purchased power and fuel	—			1,783			1,783			—			1,719			1,719
Operation and maintenance	489			192			681			481			221			702
Depreciation and amortization	521			—			521			519			—			519
Property and other taxes	98			(1		)	97			91			—			91
Other operating income	(8		)	—			(8		)	—			—			—
Total operating expenses	1,100			1,974			3,074			1,091			1,940			3,031
Operating income	577			1			578			720			1			721
Interest expense	(148		)	(1		)	(149		)	(136		)	(1		)	(137		)
Other income and expenses	33			—			33			23			—			23
Income before income taxes	462			—			462			607			—			607
Income tax (benefit) expense	(35		)	—			(35		)	141			—			141
Net income	497			—			497			466			—			466
Preferred and preference stock dividend requirements	32			—			32			31			—			31
Net income available for common stock	$	465		$	—		$	465		$	435		$	—		$	435
Net income available for common stock							$	465								$	435
Less:
Non-core earnings							—									—
Core earnings1							$	465								$	435

¹  See use of non-GAAP financial measures in "Management Overview—Highlights of Operating Results."

Earning Activities

Earning activities were primarily affected by the following:

• Lower operating revenue of $134 million primarily due to the following:

• A decrease in revenue of $227 million related to incremental tax benefits refunded to customers (offset in taxes below). The decrease in revenue resulted from $109 million of higher incremental tax repair benefits and $118 million of benefits recognized for tax accounting method changes.

• An increase in CPUC revenue of approximately $63 million primarily due to the escalation mechanism as set forth in the 2015 GRC decision and $10 million of higher operating costs subject to balancing account treatment (primarily offset in depreciation expense below). These increases were partially offset by $9 million of lower revenue related to the extension of bonus depreciation.

• Higher operation and maintenance costs of $8 million primarily due to transmission and distribution costs for line clearing and maintenance and higher information technology costs partially offset by the impact of SCE's operational and service excellence initiatives.

• Higher property and other taxes of $7 million primarily due to a higher property assessed value in 2017.

• Higher other operating income of $8 million due to the sale of utility property.

• Higher interest expense of $12 million primarily due to increased borrowings.

• Higher other income and expense of $10 million primarily due to higher AFUDC equity income.

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• Lower income taxes of $176 million primarily due to the following:

• Higher income tax benefits in 2017 of $134 million related to flow through of incremental tax repair benefits and for tax accounting method changes (offset in revenue above).

• Lower net income tax benefits in 2017 of $18 million for other property-related items, including cost of removal and depreciation deductions.

• Lower pre-tax income for the third quarter of 2017, as discussed above.

Cost-Recovery Activities

Cost-recovery activities were primarily affected by the following:

• Higher purchased power and fuel costs of $64 million primarily driven by higher power and gas prices experienced in 2017 relative to 2016, partially offset by lower capacity costs.

• Lower operation and maintenance expense of $29 million primarily driven by lower employee benefit and other labor costs and lower spending on various public purpose programs.

The following table is a summary of SCE's results of operations for the periods indicated.

Nine months ended September 30, 2017 versus September 30, 2016

	Nine months ended September 30, 2017									Nine months ended September 30, 2016
(in millions)	Earning Activities			Cost- Recovery Activities			Total Consolidated			Earning Activities			Cost- Recovery Activities			Total Consolidated
Operating revenue	$	4,813		$	4,248		$	9,061		$	4,842		$	4,114		$	8,956
Purchased power and fuel	—			3,742			3,742			—			3,576			3,576
Operation and maintenance	1,413			505			1,918			1,456			537			1,993
Depreciation and amortization	1,528			—			1,528			1,497			—			1,497
Property and other taxes	279			—			279			268			—			268
Other operating income	(8		)	—			(8		)	—			—			—
Total operating expenses	3,212			4,247			7,459			3,221			4,113			7,334
Operating income	1,601			1			1,602			1,621			1			1,622
Interest expense	(435		)	(1		)	(436		)	(401		)	(1		)	(402		)
Other income and expenses	83			—			83			71			—			71
Income before income taxes	1,249			—			1,249			1,291			—			1,291
Income tax expense	34			—			34			151			—			151
Net income	1,215			—			1,215			1,140			—			1,140
Preferred and preference stock dividend requirements	94			—			94			92			—			92
Net income available for common stock	$	1,121		$	—		$	1,121		$	1,048		$	—		$	1,048
Net income available for common stock							$	1,121								$	1,048
Less:
Non-core earnings							—									—
Core earnings1							$	1,121								$	1,048

¹  See use of non-GAAP financial measures in "Management Overview—Highlights of Operating Results."

9

Earning Activities

Earning activities were primarily affected by the following:

• Lower operating revenue of $29 million primarily due to the following:

• An increase in CPUC revenue of approximately $181 million primarily due to the escalation mechanism as set forth in the 2015 GRC decision and $28 million of higher operating costs subject to balancing account treatment (primarily offset in depreciation expense below). These increases were partially offset by $24 million of lower revenue related to the extension of bonus depreciation and a $17 million revenue reduction for the expected refund to customers of prior overcollections identified in the second quarter of 2017.

• A decrease in revenue of $185 million related to tax benefits refunded to customers (offset in income taxes below). The decrease in revenue resulted from $135 million of higher year-over-year incremental tax repair benefits recognized, $118 million of benefits recognized for tax accounting method changes, and a $65 million revenue reduction related to the tax abandonment of San Onofre. These decreases were partially offset by a 2016 revenue refund to customers of $133 million related to 2012 – 2014 incremental income tax deductions.

• A decrease in FERC-related revenue of $31 million primarily related to higher operating costs in 2016 including amortization of the regulatory asset associated with the Coolwater-Lugo transmission project (offset in depreciation below) and a $7 million reduction to FERC revenue due to a change in estimate under the FERC formula rate mechanism.

• Lower operation and maintenance costs of $43 million primarily due to the impact of SCE's operational and service excellence initiatives, lower storm-related activities and lower legal costs partially offset by higher transmission and distribution costs for line clearing and maintenance and information technology costs.

• Higher depreciation and amortization expense of $31 million primarily related to depreciation on transmission and distribution investments partially offset by amortization of the regulatory asset related to Coolwater-Lugo plant recorded in 2016.

• Higher property and other taxes of $11 million primarily due to a higher property assessed value in 2017.

• Higher other operating income of $8 million due to the sale of utility property.

• Higher interest expense of $34 million primarily due to increased borrowings and higher interest on balancing account overcollections in 2017.

• Higher other income and expenses of $12 million primarily due to higher insurance benefits and higher AFUDC equity income.

• Lower income taxes of $117 million primarily due to the following:

• Higher income tax benefits of $109 million due to $149 million related to flow through of incremental tax repair benefits and for tax accounting method changes (offset in revenue above) and $39 million related to a tax deduction for the abandonment of San Onofre, partially offset by $79 million flow-through of 2012 – 2014 incremental income tax benefits in 2016.

• Lower net income tax benefits in 2017 for other property-related items, including cost of removal and depreciation deductions.

• Lower pre-tax income for the nine months ended September 30, 2017, as discussed above.

Cost-Recovery Activities

Cost-recovery activities were primarily affected by the following:

• Higher purchased power and fuel costs of $166 million primarily driven by higher power and gas prices experienced in 2017 relative to 2016, partially offset by lower realized losses on hedging activities ($8 million in 2017 compared to $53 million in 2016) and lower capacity costs.

• Lower operation and maintenance expense of $32 million primarily driven by lower employee benefit and other labor costs and lower spending on various public purpose programs.

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Supplemental Operating Revenue Information

SCE's retail billed and unbilled revenue (excluding wholesale sales and balancing account overcollections/undercollections) was $4.0 billion and $9.0 billion for the three and nine months ended September 30, 2017, respectively, compared to $3.7 billion and $8.6 billion for the respective periods in 2016.

Retail billed and unbilled revenue for the three months ended September 30, 2017 was higher compared to the same period in 2016 due to a rate increase of $225 million and a sales volume increase of $85 million. The rate increase was due to implementation of the 2017 ERRA rate increase. The sales volume increase was primarily due to warmer weather experienced in the third quarter of 2017 compared to the same period in 2016. Retail billed and unbilled revenue for the nine months ended September 30, 2017 was higher compared to the same period in 2016 primarily due to the implementation of the 2017 ERRA rate increase.

As a result of the CPUC-authorized decoupling mechanism, SCE earnings are not affected by changes in retail electricity sales (see "Business—SCE—Overview of Ratemaking Process" in the 2016 Form 10-K).

Income Taxes

SCE's income tax expense decreased by $176 million and $117 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016.

The effective tax rates were (7.6)% and 23.2% for the three months ended September 30, 2017 and 2016, respectively. The effective tax rates were 2.7% and 11.7% for the nine months ended September 30, 2017 and 2016, respectively. SCE's effective tax rate is lower than the statutory rate primarily due to CPUC's ratemaking treatment for the current tax benefit arising from certain property-related and other temporary differences, which reverse over time. The accounting treatment for these temporary differences results in recording regulatory assets and liabilities for amounts that would otherwise be recorded to deferred income tax expense. The effective tax rate decrease for the three and nine months ended September 30, 2017 was primarily due to higher incremental repair tax benefits and benefits recognized for tax accounting method changes, all of which will be refunded to customers. The change in the effective tax rate for the nine months ended September 30, 2017 also included higher tax benefits related to the ratemaking treatment on the San Onofre tax abandonment recorded in 2017 and lower tax benefits for the $133 million revenue refund to customers that was recorded in 2016.

See "Notes to Consolidated Financial Statements—Note 7. Income Taxes" for a reconciliation of the federal statutory rate of 35% to the effective income tax rates.

Edison International Parent and Other

Results of operations for Edison International Parent and Other include amounts from other Edison International subsidiaries that are not significant as a reportable segment, as well as intercompany eliminations.

Strategic Review of Edison Energy Group Competitive Businesses

During the third quarter of 2017, Edison International completed a strategic review of Edison Energy Group's competitive businesses. The competitive businesses are undertaken through Edison Energy Group and include energy services provided by Edison Energy and distributed solar solutions provided by SoCore Energy. Edison International has concluded that it will evaluate strategic options, including potential sale opportunities for SoCore Energy and consolidate management across Edison Energy Group. Edison Energy will continue to pursue a proof of concept of its existing energy services and managed portfolio solutions practice for large energy users in the United States. Under the proof of concept, Edison Energy will seek to achieve a breakeven earnings run rate and 5% target customer penetration by the end of 2019.

In connection with the strategic review, Edison International evaluated the recoverability of goodwill and recorded an impairment of SoCore Energy's goodwill totaling $16.5 million ($10 million after-tax) in the second quarter of 2017. In light of the decision to evaluate sale opportunities for SoCore Energy, Edison International considered the application of held for sale accounting treatment under the applicable accounting guidance. However, Edison International concluded that, as of September 30, 2017, it was not probable that the investment in SoCore Energy would be sold within one year, therefore the long-lived assets of SoCore Energy were not subject to held for sale accounting treatment. Under held for sale accounting treatment, the net assets of SoCore Energy ($228 million at September 30, 2017) would be recorded at the lower of book value or as net realizable value, including transaction costs.

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Income from Continuing Operations

The following table summarizes the results of Edison International Parent and Other:

	Three months ended September 30,					Nine months ended September 30,
(in millions)	2017		2016			2017			2016
Edison Energy Group and subsidiaries1	$	3	$	(5	)	$	(20	)	$	(28	)
Edison Mission Group and subsidiaries	—		—			(2		)	(4		)
Corporate expenses and other2	2		(9		)	11			(33		)
Total Edison International Parent and Other	$	5	$	(14	)	$	(11	)	$	(65	)

¹   Includes incomeof less than $1 million and $1 million for the three and nine months ended September 30, 2017, respectively, compared to income of less than $1 million and $5 million for the same periods in 2016, respectively, related to losses (net of distributions) allocated to tax equity investors under the HLBV accounting method.

²  Includes interest expense (pre-tax) of $12 million and $10 million for the three months ended September 30, 2017 and 2016, respectively, and $34 million and $27 million for the nine months ended September 30, 2017 and 2016, respectively.

The loss from continuing operations of Edison International Parent and Other decreased $19 million and $54 million for the three and nine months ended September 30, 2017, respectively, compared to the same periods in 2016 primarily due to:

• Higher income tax benefits related to stock option exercises of $1 million and $34 million for the three and nine months ended September 30, 2017, respectively, $17 million of tax benefits recorded during the third quarter of 2017 from net operating loss carrybacks that resulted from the filing of the 2016 tax returns and $6 million of tax benefits recorded in the second quarter of 2017 related to settlements with the IRS for taxable years 2007 – 2012.

• In the second quarter of 2017, Edison Energy Group recorded a $10 million after-tax charge from a goodwill impairment on the SoCore Energy reporting unit and a $13 million after-tax charge during the second quarter of 2016 from a buy-out of an earn-out provision contained in one of the 2015 acquisitions.

LIQUIDITY AND CAPITAL RESOURCES

Southern California Edison Company

SCE's ability to operate its business, fund capital expenditures, and implement its business strategy is dependent upon its cash flow and access to the bank and capital markets. SCE's overall cash flows fluctuate based on, among other things, its ability to recover its costs in a timely manner from its customers through regulated rates, changes in commodity prices and volumes, collateral requirements, interest obligations and dividend payments to Edison International, and the outcome of tax and regulatory matters.

In the next 12 months, SCE expects to fund its obligations, capital expenditures, and dividends through operating cash flows, tax benefits, and capital market financings, as needed. SCE also has availability under its credit facilities to fund liquidity requirements.

Available Liquidity

At September 30, 2017, SCE had approximately $2.15 billion available under its $2.75 billion multi-year revolving credit facility. In addition, SCE issued debt and preference stock in 2017. For further details, see "Notes to Consolidated Financial Statements—Note 5. Debt and Credit Agreements" and "—Note 12. Preferred and Preference Stock of SCE."

Debt Covenant

A debt covenant in SCE's credit facility limits its debt to total capitalization ratio to less than or equal to 0.65 to 1. At September 30, 2017, SCE's debt to total capitalization ratio was 0.43 to 1.

At September 30, 2017, SCE was in compliance with all other financial covenants that affect access to capital.

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Capital Investment Plan

Below are updates for large transmission and substation projects since the filing of the 2016 Form 10-K. SCE is currently evaluating the timing of its major construction projects. For further information on these projects, see "Liquidity and Capital Resources—SCE—Capital Investment Plan—Major Transmission Projects" in the year-end 2016 MD&A.

Major Transmission Projects

West of Devers

In March 2017, the CPUC issued a decision denying ORA's September 2016 Application for Rehearing regarding the West of Devers Upgrade Project which sought additional project modifications and environmental mitigation measures. This action confirmed SCE's proposed project, which is expected to be placed in service in 2021, although there is potential of a delay. SCE is evaluating the competitive bids received for transmission construction and expects to award the contract for the Project by the end of 2017, which may result in a change to the expected cost of the Project.

Mesa Substation

In February 2017, the CPUC issued a final decision approving the Mesa Substation Project largely consistent with SCE's proposed project and rejected alternative project configurations proposed by CPUC staff. SCE expects the Mesa Substation project to go into service in 2022. Competitive bids for the 220kV substation construction are under evaluation, and the remainder (550kV substation) will be put out for bid in 2018. SCE expects to award the bid for the 220kV substation construction by the end of 2017, which may result in a change to the expected cost. Preconstruction requirements for other permits and approvals have been obtained and construction began in October 2017.

Alberhill System

In April 2017, the CPUC issued a final environmental impact report for the Alberhill System Project. This report rejected different alternatives recommended by CPUC staff and intervenors, selecting SCE's proposed project as the environmentally superior project. A final CPUC decision to approve the Project for construction is anticipated during 2018. As SCE prepares for the commencement of construction, updated annual capital spending will be incorporated into the capital program forecast.

Riverside Transmission Reliability

The Riverside Transmission Reliability Project is a joint project between SCE and Riverside Public Utilities (RPU), the municipal utility department of the City of Riverside. Due to changed circumstances since the time the Project was originally developed, SCE informed the CPUC in August 2016 that it supports revisions to the proposed Project. The CPUC continues to collect information regarding the revised Project or other proposed revisions in support of a supplemental environmental review. Impacts from the potential revisions to the Project have not been reflected in the expected costs or scheduled in-service date of 2021.

Eldorado-Lugo-Mohave Upgrade

The Eldorado-Lugo-Mohave Upgrade Project will increase capacity on existing transmission lines to allow additional renewable energy to flow from Nevada to southern California. SCE has proposed an expedited schedule and a non-standard review process with the regulatory permitting agencies in order to meet the current in-service date. SCE recently awarded the competitive bid for the Project and has not yet incorporated the contract into the capital forecast.

Coolwater-Lugo

In the first quarter of 2017, the FERC approved a settlement allowing SCE to recover 100% of the requested $37.1 million of costs incurred by SCE related to the cancelled Coolwater-Lugo transmission project.

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Dividend Restrictions

The CPUC regulates SCE's capital structure which limits the dividends it may pay Edison International. SCE may make distributions to Edison International as long as the common equity component of SCE's capital structure remains at or above 48% on a 13-month weighted average basis. At September 30, 2017, SCE's 13-month weighted-average common equity component of total capitalization was 50.2% and the maximum additional dividend that SCE could pay to Edison International under this limitation was approximately $554 million, resulting in a restriction on net assets of approximately $14.4 billion.

In the third quarter of 2017, SCE declared a dividend to Edison International of $191 million. Future dividend amounts and timing of distributions are dependent on a number of factors including the level of capital expenditures, operating cash flows and earnings.

Margin and Collateral Deposits

Certain derivative instruments, power contracts and other contractual arrangements contain collateral requirements. Future collateral requirements may differ from the requirements at September 30, 2017, due to the addition of incremental power and energy procurement contracts with collateral requirements, if any, and the impact of changes in wholesale power and natural gas prices on SCE's contractual obligations.

Some of the power contracts contain provisions that require SCE to maintain an investment grade credit rating from the major credit rating agencies. If SCE's credit rating were to fall below investment grade, SCE may be required to pay the liability or post additional collateral.

The table below provides the amount of collateral posted by SCE to its counterparties as well as the potential collateral that would have been required as of September 30, 2017.

(in millions)
Collateral posted as of September 30, 20171	$	274
Incremental collateral requirements for power contracts resulting from a potential downgrade of SCE's credit rating to below investment grade	33
Incremental collateral requirements for power contracts resulting from adverse market price movement2	2
Posted and potential collateral requirements	$	309

¹  Collateral provided to counterparties and other brokers consisted of $269 million in letters of credit and surety bonds and $5 million of cash.

²  Incremental collateral requirements were based on potential changes in SCE's forward positions as of September 30, 2017 due to adverse market price movements over the remaining lives of the existing power contracts using a 95% confidence level.

Edison International Parent and Other

Edison International Parent and Other's liquidity and its ability to pay operating expenses and pay dividends to common shareholders are dependent on dividends from SCE, realization of tax benefits, and access to bank and capital markets. Edison International may also finance working capital requirements, payment of obligations, and capital investments, including capital contributions to subsidiaries, with commercial paper or other borrowings, subject to availability in the bank and capital markets.

At September 30, 2017, Edison International Parent had $677 million available under its $1.25 billion multi-year revolving credit facility. In addition, Edison International issued debt in 2017. For further details, see "Notes to Consolidated Financial Statements—Note 5. Debt and Credit Agreements."

A debt covenant in Edison International Parent's credit facility requires a consolidated debt to total capitalization ratio as defined in the credit agreement of less than or equal to 0.65 to 1. At September 30, 2017, Edison International Parent's consolidated debt to total capitalization ratio was 0.47 to 1.

At September 30, 2017, Edison International Parent was also in compliance with all other financial covenants that affect access to capital.

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Historical Cash Flows

Southern California Edison Company

	Nine months ended September 30,
(in millions)	2017			2016
Net cash provided by operating activities	$	2,793		$	2,838
Net cash used in financing activities	(339		)	(382		)
Net cash used in investing activities	(2,432		)	(2,443		)
Net increase in cash and cash equivalents	$	22		$	13

Net Cash Provided by Operating Activities

The following table summarizes major categories of net cash provided by operating activities as provided in more detail in SCE's consolidated statements of cash flows for the nine months ended September 30, 2017 and 2016.

	Nine months ended September 30,						Change in cash flows
(in millions)	2017			2016			2017/2016
Net income	$	1,215		$	1,140
Non-cash items1	1,853			1,597
Subtotal	$	3,068		$	2,737		$	331
Changes in cash flow resulting from working capital2	(553		)	(32		)	(521		)
Derivative assets and liabilities	(24		)	15			(39		)
Regulatory assets and liabilities	560			189			371
Other noncurrent assets and liabilities3	(258		)	(71		)	(187		)
Net cash provided by operating activities	$	2,793		$	2,838		$	(45	)

¹  Non-cash items include depreciation and amortization, allowance for equity during construction, deferred income taxes and investment tax credits, and other.

²  Changes in working capital items include receivables, inventory, accounts payable, prepaid and accrued taxes, and other current assets and liabilities.

³ Includes the nuclear decommissioning trusts.

Net cash provided by operating activities was impacted by the following:

Net income increased in 2017 by $75 million primarily due to higher revenue in 2017 due to the escalation mechanism set forth in the 2015 GRC decision and lower operation and maintenance expenses, partially offset by reductions in CPUC revenue related to prior overcollections and higher financing costs.

Net cash for working capital for the nine months ended September 30, 2017 and 2016 was primarily related to the increase in receivables from customers ($370 million and $261 million in 2017 and 2016, respectively) and the timing of disbursements (including payments for payroll-related costs and purchased power). During the first nine months of 2017, there was an increase in payables of $30 million compared to $195 million for the same period in 2016. In addition, net cash for working capital included changes in tax payables of $(146) million in 2017 and $111 million in 2016 primarily due to the utilization of net operating losses in 2017.

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Net cash provided by regulatory assets and liabilities, including changes in over (under) collections of balancing accounts was $560 million and $189 million during the nine months ended September 30, 2017 and 2016, respectively. SCE has a number of balancing accounts, which impact cash flows based on differences between timing of collection of amounts through rates and accrual expenditures. Cash flows were primarily impacted by the following:

2017

• The 2015 GRC decision established the TAMA. As a result of this memorandum account, together with a balancing account for pole loading expenditures, 2015 – 2017 tax benefits or costs associated with certain events are tracked and adjusted annually through customer rates. Overcollections increased by $319 million during the first nine months of 2017 primarily due to higher tax repair deductions than forecasted in rates and $118 million of higher benefits recognized for tax accounting method changes. The overcollections in 2017 are expected to be refunded to customers in January 2018.

• Higher cash due to $186 million of overcollections for the public purpose and energy efficiency programs. Overcollections for public purpose and energy efficiency programs increased due to lower spending for these programs and recovery of prior year undercollections.

• Higher cash due to $140 million of overcollections related to FERC balancing accounts. Overcollections increased due to recovery of prior FERC undercollections and lower costs than forecasted in the FERC formula rate.

• Higher cash due to $94 million of overcollections related to the timing of greenhouse gas auction revenue and climate credit refunds to customers, which are expected to be refunded to customers in the fourth quarter of 2017.

• Higher cash due to realization of $47 million in proceeds from the MHI arbitration and approximately $34 million from the Department of Energy related to spent nuclear fuel. For further information on the MHI claims and spent nuclear fuel, see "Notes to Consolidated Financial Statements—Note 11. Commitments and Contingencies—Contingencies—San Onofre Related Matters" and "—Spent Nuclear Fuel."

• BRRBA overcollections decreased by $161 million during the first nine months of 2017 primarily due to the refunds of 2016 overcollections related to TAMA, a revenue refund to customers of $133 million for 2012 – 2014 incremental tax benefits related to repair deductions, and 2015 overcollections resulting from the implementation of the 2015 GRC decision, which was authorized to be refunded to customers over a two year period. The BRRBA tracks the differences between amounts authorized by the CPUC in the GRC proceedings and amounts billed to customers.

• Net undercollections for ERRA and the new system generation program were $91 million at September 30, 2017 compared to net overcollections of $26 million at December 31, 2016. Net undercollections increased $117 million during the first nine months of 2017 primarily due to a refund of prior year overcollections and an increase in costs due to higher load requirements than forecasted in rates.

2016

• Higher cash due to an increase in overcollections of $300 million for the public purpose and energy efficiency programs due to higher funding and lower spending for these programs during the first nine months of 2016.

• ERRA overcollections for fuel and purchased power decreased by $231 million during the first nine months of 2016 primarily due to the implementation of the 2016 ERRA rate decrease in January 2016, partially offset by lower than forecasted power and gas prices experienced in 2016.

• An increase in cash of approximately $122 million due to a refund from the Department of Energy's failure to meet its obligation to begin accepting spent nuclear fuel from San Onofre. See "Notes to Consolidated Financial Statements—Note 11. Commitments and Contingencies—Contingencies—Spent Nuclear Fuel" for further discussion.

Cash flows used in other noncurrent assets and liabilities were primarily related to net earnings from nuclear decommissioning trust investments ($47 million and $33 million in 2017 and 2016, respectively), SCE's payments of decommissioning costs ($170 million and $125 million in 2017 and 2016, respectively) and changes in uncertain tax positions due to the utilization of net operating losses ($(105) million and $(4) million in 2017 and 2016, respectively). See "Nuclear Decommissioning Activities" below for further discussion.

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Net Cash Used in Financing Activities

The following table summarizes cash provided by financing activities for the nine months ended September 30, 2017 and 2016. Issuances of debt and preference stock are discussed in "Notes to Consolidated Financial Statements—Note 5. Debt and Credit Agreements—Long-Term Debt" and "—Note 12. Preferred and Preference Stock of SCE."

	Nine months ended September 30,
(in millions)	2017			2016
Issuances of first and refunding mortgage bonds, net of premium (discount) and issuance costs	$	1,011		$	—
Issuance of term loan	300			—
Remarketing of pollution control bonds, net of issuance costs	134			—
Long-term debt matured or repurchased	(781		)	(81		)
Issuances of preference stock, net of issuance costs	463			294
Redemptions of preference stock	(475		)	(125		)
Short-term debt (repayments), net of borrowings and discount	(441		)	189
Payments of common stock dividends to Edison International	(382		)	(510		)
Payments of preferred and preference stock dividends	(99		)	(97		)
Other	(69		)	(52		)
Net cash used in financing activities	$	(339	)	$	(382	)

Net Cash Used in Investing Activities

Cash flows used in investing activities are primarily due to capital expenditures related to transmission and distributioninvestments ($2.6 billion and $2.7 billion for the nine months ended September 30, 2017 and 2016, respectively). During the first nine months of 2017 and 2016, SCE had a net redemption of nuclear decommissioning trust investments of $117 million and $159 million, respectively. See "Nuclear Decommissioning Activities" below for further discussion. In addition, during the first nine months of 2017 and 2016, SCE received proceeds of $26 million and $140 million, respectively, for loans on the cash surrender value of life insurance policies. The proceeds were used for general corporate purposes.

Nuclear Decommissioning Activities

SCE's statement of cash flows includes nuclear decommissioning activities, which are reflected in the following line items:

	Nine months ended September 30,
(in millions)	2017			2016
Net cash used in operating activities:    Net earnings from nuclear decommissioning trust investments	$	47		$	33
SCE's decommissioning costs	(170		)	(125		)
Net cash provided by investing activities:    Proceeds from sale of investments	3,974			2,075
Purchases of investments	(3,857		)	(1,916		)
Net cash impact	$	(6	)	$	67

Net cash used in operating activities relate to interest and dividends less administrative expenses, taxes, and SCE's decommissioning costs. See "Notes to Consolidated Financial Statements—Note 9. Investments" for further information. Investing activities represent the purchase and sale of investments within the nuclear decommissioning trusts, including the reinvestment of earnings from nuclear decommissioning trust investments. The net cash impact reflects timing of decommissioning payments ($170 million and $125 million in 2017 and 2016, respectively) and reimbursements to SCE from the nuclear decommissioning trust ($164 million and $192 million in 2017 and 2016, respectively). The 2016 net cash impact included reimbursements for 2016 and a portion of 2015, 2014, and 2013 decommissioning costs.

17

Edison International Parent and Other

The table below sets forth condensed historical cash flow from operations for Edison International Parent and Other.

	Nine months ended September 30,
(in millions)	2017			2016
Net cash used in operating activities	$	(103	)	$	(336	)
Net cash provided by financing activities	163			280
Net cash used in investing activities	(61		)	(34		)
Net decrease in cash and cash equivalents	$	(1	)	$	(90	)

Net Cash Used in Operating Activities

Net cash used in operating activities was impacted by the following:

• $103 million cash outflow from operating activities in 2017 compared to $101 million cash outflow in 2016 due to payments and receipts relating to interest and operating costs.

• $214 million of cash payment made to the Reorganization Trust in September 2016 related to the EME Settlement Agreement.

• $21 million outflow in June 2016 related to the buy-out of an earn-out provision with the former shareholders of a company acquired by Edison Energy in 2015. See "Results of Operations—Edison International Parent and Other—Income from Continuing Operations" for further information.

Net Cash Provided by Financing Activities

Net cash provided by financing activities was as follows:

	Nine months ended September 30,
(in millions)	2017			2016
Dividends paid to Edison International common shareholders	$	(530	)	$	(469	)
Dividends received from SCE	382			510
Payment for stock-based compensation, net of receipt from stock option exercises	(129		)	(25		)
Long-term debt issuance, net of discount and issuance costs	791			397
Long-term debt repayment	(401		)	(2		)
Short-term debt borrowings, net of (repayments) and discount	40			(129		)
Other	10			(2		)
Net cash provided by financing activities	$	163		$	280

Contingencies

SCE has contingencies related to San Onofre Related Matters, Environmental Remediation, Nuclear Insurance, Wildfire Insurance, Spent Nuclear Fuel and other legal matters, which are discussed in "Notes to Consolidated Financial Statements—Note 11. Commitments and Contingencies."

MARKET RISK EXPOSURES

Edison International's and SCE's primary market risks are described in the 2016 Form 10-K. For a further discussion of market risk exposures, including commodity price risk, credit risk, and interest rate risk, see "Notes to Consolidated Financial Statements—Note 4. Fair Value Measurements" and "—Note 6. Derivative Instruments."

18

Commodity Price Risk

The fair value of outstanding derivative instruments used to mitigate exposure to commodity price risk was a net liability of $1.1 billion at December 31, 2016. During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms. The fair value of the remaining derivative instruments at September 30, 2017 was $35 million.

For further discussion of fair value measurements and the fair value hierarchy, see "Notes to Consolidated Financial Statements—Note 4. Fair Value Measurements" and "— Note 6. Derivative Instruments."

Credit Risk

Credit risk exposure from counterparties for power and gas trading activities is measured as the sum of net accounts receivable (accounts receivable less accounts payable) and the current fair value of net derivative assets (derivative assets less derivative liabilities) reflected on the consolidated balance sheets. SCE enters into master agreements which typically provide for a right of setoff. Accordingly, SCE's credit risk exposure from counterparties is based on a net exposure under these arrangements. SCE manages the credit risk on the portfolio for both rated and non-rated counterparties based on credit ratings using published ratings of counterparties and other publicly disclosed information, such as financial statements, regulatory filings, and press releases, to guide it in the process of setting credit levels, risk limits, and contractual arrangements, including master netting agreements.

As of September 30, 2017, the amount of balance sheet exposure as described above broken down by the credit ratings of SCE's counterparties, was as follows:

	September 30, 2017
(in millions)	Exposure2		Collateral		Net Exposure
S&P Credit Rating1
A or higher	$	38	$	—	$	38

¹  SCE assigns a credit rating based on the lower of a counterparty's S&P, Fitch or Moody's rating. For ease of reference, the above table uses the S&P classifications to summarize risk, but reflects the lower of the three credit ratings.

²  Exposure excludes amounts related to contracts classified as normal purchases and sales and non-derivative contractual commitments that are not recorded on the consolidated balance sheets, except for any related net accounts receivable.

CRITICAL ACCOUNTING ESTIMATES AND POLICIES

For a complete discussion on Edison International's and SCE's critical accounting policies, see "Critical Accounting Estimates and Policies" in the year-ended 2016 MD&A.

NEW ACCOUNTING GUIDANCE

New accounting guidance is discussed in "Notes to Consolidated Financial Statements—Note 1. Summary of Significant Accounting Policies—New Accounting Guidance."

QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Information responding to this section is included in the MD&A under the heading "Market Risk Exposures" and is incorporated herein by reference.

19

FINANCIAL STATEMENTS

Consolidated Statements of Income	Edison International
	Three months ended September 30,						Nine months ended September 30,
(in millions, except per-share amounts, unaudited)	2017			2016			2017			2016
Operating revenue	$	3,672		$	3,767		$	9,100		$	8,985
Purchased power and fuel	1,783			1,719			3,742			3,576
Operation and maintenance	713			740			2,016			2,090
Depreciation and amortization	524			521			1,535			1,504
Property and other taxes	98			92			284			269
Impairment charges	—			—			22			—
Other operating (income) and expenses	(7		)	—			(8		)	21
Total operating expenses	3,111			3,072			7,591			7,460
Operating income	561			695			1,509			1,525
Interest and other income	42			32			111			97
Interest expense	(162		)	(147		)	(473		)	(431		)
Other expenses	(9		)	(9		)	(28		)	(29		)
Income from continuing operations before income taxes	432			571			1,119			1,162
Income tax (benefit) expense	(69		)	120			(83		)	96
Income from continuing operations	501			451			1,202			1,066
Income from discontinued operations, net of tax	—			—			—			(1		)
Net income	501			451			1,202			1,065
Preferred and preference stock dividend requirements of SCE	32			31			94			92
Other noncontrolling interests	(1		)	(1		)	(2		)	(9		)
Net income attributable to Edison International common shareholders	$	470		$	421		$	1,110		$	982
Amounts attributable to Edison International common shareholders:
Income from continuing operations, net of tax	$	470		$	421		$	1,110		$	983
Income from discontinued operations, net of tax	—			—			—			(1		)
Net income attributable to Edison International common shareholders	$	470		$	421		$	1,110		$	982
Basic earnings per common share attributable to Edison International common shareholders:
Weighted-average shares of common stock outstanding	326			326			326			326
Continuing operations	$	1.44		$	1.29		$	3.41		$	3.01
Discontinued operations	—			—			—			—
Total	$	1.44		$	1.29		$	3.41		$	3.01
Diluted earnings per common share attributable to Edison International common shareholders:
Weighted-average shares of common stock outstanding, including effect of dilutive securities	328			330			329			330
Continuing operations	$	1.43		$	1.27		$	3.38		$	2.98
Discontinued operations	—			—			—			—
Total	$	1.43		$	1.27		$	3.38		$	2.98
Dividends declared per common share	$	0.5425		$	0.4800		$	1.6275		$	1.4400

The accompanying notes are an integral part of these consolidated financial statements.

20

Consolidated Statements of Comprehensive Income	Edison International
	Three months ended September 30,					Nine months ended September 30,
(in millions, unaudited)	2017			2016		2017		2016
Net income	$	501		$	451	$	1,202	$	1,065
Other comprehensive income, net of tax:
Pension and postretirement benefits other than pensions:
Amortization of net loss included in net income	2			2		5		5
Other	(2		)	—		—		—
Other comprehensive income, net of tax	—			2		5		5
Comprehensive income	501			453		1,207		1,070
Less: Comprehensive income attributable to noncontrolling interests	31			30		92		83
Comprehensive income attributable to Edison International	$	470		$	423	$	1,115	$	987

The accompanying notes are an integral part of these consolidated financial statements.

21

Consolidated Balance Sheets	Edison International
(in millions, unaudited)	September 30, 2017		December 31, 2016
ASSETS
Cash and cash equivalents	$	117	$	96
Receivables, less allowances of $55 and $62 for uncollectible accounts at respective dates	1,105		714
Accrued unbilled revenue	352		370
Inventory	229		239
Prepaid taxes	179		1
Derivative assets	36		73
Regulatory assets	445		350
Other current assets	295		280
Total current assets	2,758		2,123
Nuclear decommissioning trusts	4,415		4,242
Other investments	72		83
Total investments	4,487		4,325
Utility property, plant and equipment, less accumulated depreciation and amortization of $9,173 and $9,000 at respective dates	37,666		36,806
Nonutility property, plant and equipment, less accumulated depreciation of $109 and $99 at respective dates	295		194
Total property, plant and equipment	37,961		37,000
Regulatory assets	8,028		7,455
Other long-term assets	358		416
Total long-term assets	8,386		7,871
Total assets	$	53,592	$	51,319

The accompanying notes are an integral part of these consolidated financial statements.

22

Consolidated Balance Sheets	Edison International
(in millions, except share amounts, unaudited)	September 30, 2017			December 31, 2016
LIABILITIES AND EQUITY
Short-term debt	$	908		$	1,307
Current portion of long-term debt	583			981
Accounts payable	1,104			1,342
Accrued taxes	90			50
Customer deposits	276			269
Derivative liabilities	3			216
Regulatory liabilities	1,281			756
Other current liabilities	1,164			991
Total current liabilities	5,409			5,912
Long-term debt	11,638			10,175
Deferred income taxes and credits	9,141			8,327
Derivative liabilities	—			941
Pensions and benefits	1,378			1,354
Asset retirement obligations	2,682			2,590
Regulatory liabilities	5,858			5,726
Other deferred credits and other long-term liabilities	2,863			2,102
Total deferred credits and other liabilities	21,922			21,040
Total liabilities	38,969			37,127
Commitments and contingencies (Note 11)
Redeemable noncontrolling interest	13			5
Common stock, no par value (800,000,000 shares authorized; 325,811,206 shares issued and outstanding at respective dates)	2,520			2,505
Accumulated other comprehensive loss	(48		)	(53		)
Retained earnings	9,944			9,544
Total Edison International's common shareholders' equity	12,416			11,996
Noncontrolling interests – preferred and preference stock of SCE	2,194			2,191
Total equity	14,610			14,187
Total liabilities and equity	$	53,592		$	51,319

The accompanying notes are an integral part of these consolidated financial statements.

23

Consolidated Statements of Cash Flows	Edison International
	Nine months ended September 30,
(in millions, unaudited)	2017			2016
Cash flows from operating activities:
Net income	$	1,202		$	1,065
Less: loss from discontinued operations	—			(1		)
Income from continuing operations	1,202			1,066
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	1,591			1,575
Allowance for equity during construction	(65		)	(58		)
Impairment charges	22			—
Deferred income taxes and investment tax credits	77			114
Other	8			17
Nuclear decommissioning trusts	(117		)	(159		)
EME settlement payments, net of insurance proceeds	—			(209		)
Changes in operating assets and liabilities:
Receivables	(387		)	(235		)
Inventory	10			(43		)
Accounts payable	(11		)	151
Prepaid and accrued taxes	(128		)	56
Other current assets and liabilities	(17		)	(68		)
Derivative assets and liabilities	(24		)	15
Regulatory assets and liabilities	560			189
Other noncurrent assets and liabilities	(31		)	91
Net cash provided by operating activities	2,690			2,502
Cash flows from financing activities:
Long-term debt issued or remarketed, net of premium, discount and issuance costs of $1 and $(3) for respective periods	2,236			397
Long-term debt matured or repurchased	(1,182		)	(83		)
Preference stock issued, net	463			294
Preference stock redeemed	(475		)	(125		)
Short-term debt financing, net	(401		)	60
Payments for stock-based compensation	(365		)	(175		)
Receipt from stock option exercises	201			102
Dividends to noncontrolling interests	(100		)	(98		)
Dividends paid	(530		)	(469		)
Other	(23		)	(5		)
Net cash used in financing activities	(176		)	(102		)
Cash flows from investing activities:
Capital expenditures	(2,660		)	(2,773		)
Proceeds from sale of nuclear decommissioning trust investments	3,974			2,075
Purchases of nuclear decommissioning trust investments	(3,857		)	(1,916		)
Life insurance policy loan proceeds	26			140
Other	24			(3		)
Net cash used in investing activities	(2,493		)	(2,477		)
Net increase (decrease) in cash and cash equivalents	21			(77		)
Cash and cash equivalents at beginning of period	96			161
Cash and cash equivalents at end of period	$	117		$	84

The accompanying notes are an integral part of these consolidated financial statements.

24

Consolidated Statements of Income	Southern California Edison Company
	Three months ended September 30,						Nine months ended September 30,
(in millions, unaudited)	2017			2016			2017			2016
Operating revenue	$	3,652		$	3,752		$	9,061		$	8,956
Purchased power and fuel	1,783			1,719			3,742			3,576
Operation and maintenance	681			702			1,918			1,993
Depreciation and amortization	521			519			1,528			1,497
Property and other taxes	97			91			279			268
Other operating income	(8		)	—			(8		)	—
Total operating expenses	3,074			3,031			7,459			7,334
Operating income	578			721			1,602			1,622
Interest and other income	42			32			111			97
Interest expense	(149		)	(137		)	(436		)	(402		)
Other expenses	(9		)	(9		)	(28		)	(26		)
Income before income taxes	462			607			1,249			1,291
Income tax (benefit) expense	(35		)	141			34			151
Net income	497			466			1,215			1,140
Less: Preferred and preference stock dividend requirements	32			31			94			92
Net income available for common stock	$	465		$	435		$	1,121		$	1,048

Consolidated Statements of Comprehensive Income	Southern California Edison Company
	Three months ended September 30,				Nine months ended September 30,
(in millions, unaudited)	2017		2016		2017		2016
Net income	$	497	$	466	$	1,215	$	1,140
Other comprehensive income, net of tax:
Pension and postretirement benefits other than pensions:
Amortization of net loss included in net income	—		1		2		3
Other comprehensive income, net of tax	—		1		2		3
Comprehensive income	$	497	$	467	$	1,217	$	1,143

The accompanying notes are an integral part of these consolidated financial statements.

25

Consolidated Balance Sheets Southern California Edison Company

(in millions, unaudited)	September 30, 2017		December 31, 2016
ASSETS
Cash and cash equivalents	$	61	$	39
Receivables, less allowances of $55 and $61 for uncollectible accounts at respective dates	1,087		699
Accrued unbilled revenue	351		369
Inventory	229		239
Prepaid taxes	209		16
Derivative assets	36		73
Regulatory assets	445		350
Other current assets	270		246
Total current assets	2,688		2,031
Nuclear decommissioning trusts	4,415		4,242
Other investments	49		50
Total investments	4,464		4,292
Utility property, plant and equipment, less accumulated depreciation and amortization of $9,173 and $9,000 at respective dates	37,666		36,806
Nonutility property, plant and equipment, less accumulated depreciation of $94 and $89 at respective dates	73		75
Total property, plant and equipment	37,739		36,881
Regulatory assets	8,028		7,455
Other long-term assets	229		232
Total long-term assets	8,257		7,687
Total assets	$	53,148	$	50,891

The accompanying notes are an integral part of these consolidated financial statements.

26

Consolidated Balance Sheets Southern California Edison Company

(in millions, except share amounts, unaudited)	September 30, 2017			December 31, 2016
LIABILITIES AND EQUITY
Short-term debt	$	329		$	769
Current portion of long-term debt	579			579
Accounts payable	1,100			1,344
Accrued taxes	92			45
Customer deposits	276			269
Derivative liabilities	3			216
Regulatory liabilities	1,281			756
Other current liabilities	1,098			729
Total current liabilities	4,758			4,707
Long-term debt	10,426			9,754
Deferred income taxes and credits	10,966			9,886
Derivative liabilities	—			941
Pensions and benefits	944			896
Asset retirement obligations	2,675			2,586
Regulatory liabilities	5,858			5,726
Other deferred credits and other long-term liabilities	2,528			1,912
Total deferred credits and other liabilities	22,971			21,947
Total liabilities	38,155			36,408
Commitments and contingencies (Note 11)
Common stock, no par value (560,000,000 shares authorized; 434,888,104 shares issued and outstanding at each date)	2,168			2,168
Additional paid-in capital	668			657
Accumulated other comprehensive loss	(18		)	(20		)
Retained earnings	9,930			9,433
Total common shareholder's equity	12,748			12,238
Preferred and preference stock	2,245			2,245
Total equity	14,993			14,483
Total liabilities and equity	$	53,148		$	50,891

The accompanying notes are an integral part of these consolidated financial statements.

27

Consolidated Statements of Cash Flows Southern California Edison Company

	Nine months ended September 30,
(in millions, unaudited)	2017			2016
Cash flows from operating activities:
Net income	$	1,215		$	1,140
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	1,581			1,564
Allowance for equity during construction	(65		)	(58		)
Deferred income taxes and investment tax credits	337			84
Other	—			7
Nuclear decommissioning trusts	(117		)	(159		)
Changes in operating assets and liabilities:
Receivables	(389		)	(256		)
Inventory	11			5
Accounts payable	(16		)	152
Prepaid and accrued taxes	(146		)	111
Other current assets and liabilities	(13		)	(44		)
Derivative assets and liabilities	(24		)	15
Regulatory assets and liabilities	560			189
Other noncurrent assets and liabilities	(141		)	88
Net cash provided by operating activities	2,793			2,838
Cash flows from financing activities:
Long-term debt issued or remarketed, net of premium, discount and issuance costs of $10 for the nine months ended September 30, 2017	1,445			—
Long-term debt matured or repurchased	(781		)	(81		)
Preference stock issued, net	463			294
Preference stock redeemed	(475		)	(125		)
Short-term debt financing, net	(441		)	189
Payments for stock-based compensation	(80		)	(121		)
Receipt from stock option exercises	45			73
Dividends paid	(481		)	(607		)
Other	(34		)	(4		)
Net cash used in financing activities	(339		)	(382		)
Cash flows from investing activities:
Capital expenditures	(2,596		)	(2,747		)
Proceeds from sale of nuclear decommissioning trust investments	3,974			2,075
Purchases of nuclear decommissioning trust investments	(3,857		)	(1,916		)
Life insurance policy loan proceeds	26			140
Other	21			5
Net cash used in investing activities	(2,432		)	(2,443		)
Net increase in cash and cash equivalents	22			13
Cash and cash equivalents, beginning of period	39			26
Cash and cash equivalents, end of period	$	61		$	39

The accompanying notes are an integral part of these consolidated financial statements.

28

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Note 1.    Summary of Significant Accounting Policies

Organization and Basis of Presentation

Edison International is the parent holding company of Southern California Edison Company ("SCE"). SCE is an investor-owned public utility primarily engaged in the business of supplying and delivering electricity to an approximately 50,000 square mile area of southern California. Edison International is also the parent company of Edison Energy Group, Inc., a holding company for subsidiaries engaged in pursuing competitive business opportunities across energy services, managed portfolio solutions, and distributed solar solutions for commercial and industrial customers. Such business activities are currently not material to report as a separate business segment. These combined notes to the consolidated financial statements apply to both Edison International and SCE unless otherwise described. Edison International's consolidated financial statements include the accounts of Edison International, SCE, and other wholly owned and controlled subsidiaries. References to Edison International refer to the consolidated group of Edison International and its subsidiaries. References to Edison International Parent and Other refer to Edison International Parent and its competitive subsidiaries. SCE's consolidated financial statements include the accounts of SCE and its wholly owned and controlled subsidiaries. All intercompany transactions have been eliminated from the consolidated financial statements.

Edison International's and SCE's significant accounting policies were described in Note 1 of "Notes to Consolidated Financial Statements" included in Edison International's and SCE's combined Annual Report on Form 10-K for the year-ended December 31, 2016 (the "2016 Form 10-K"). This quarterly report should be read in conjunction with the financial statements and notes included in the 2016 Form 10-K.

In the opinion of management, all adjustments, consisting of recurring accruals, have been made that are necessary to fairly state the consolidated financial position, results of operations, and cash flows in accordance with accounting principles generally accepted in the United States ("GAAP") for the periods covered by this quarterly report on Form 10-Q. The results of operations for the three- and nine-month periods ended September 30, 2017 are not necessarily indicative of the operating results for the full year.

The December 31, 2016 financial statement data was derived from audited financial statements, but does not include all disclosures required by GAAP.

During the fourth quarter of 2016, Edison International and SCE early adopted an accounting standard for share-based payments using the modified retrospective approach, effective January 1, 2016. Prior year financial statements have been updated to reflect the modified retrospective application of this accounting standard. For further information, see Note 1 and Note 18 of "Notes to Consolidated Financial Statements" included in the 2016 Form 10-K and Note 2 and Note 7 of this Form 10-Q.

Cash Equivalents

Cash equivalents includes investments in money market funds. Generally, the carrying value of cash equivalents equals the fair value, as these investments have original maturities of three months or less. The cash equivalents were as follows:

	Edison International				SCE
(in millions)	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Money market funds	$	49	$	41	$	25	$	18

Cash is temporarily invested until required for check clearing. Checks issued, but not yet paid by the financial institution, are reclassified from cash to accounts payable at the end of each reporting period as follows:

	Edison International				SCE
(in millions)	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Book balances reclassified to accounts payable	$	85	$	138	$	85	$	136

29

Goodwill

Edison International assesses goodwill through annual goodwill impairment tests, at the reporting unit level as of October 1st of each year. Edison International updates these tests between annual tests if events occur or circumstances change such that it is more likely than not that the fair value of a reporting unit is below its carrying value. In connection with a strategic review of the Edison Energy Group's competitive businesses, Edison International evaluated the recoverability of goodwill and recorded an impairment of SoCore Energy's goodwill totaling $16.5 million ($10 million after-tax) in the second quarter of 2017. As of September 30, 2017, goodwill is comprised of $78 million at the Edison Energy reporting unit and $5 million at the SoCore Energy reporting unit.

Earnings Per Share

Edison International computes earnings per common share ("EPS") using the two-class method, which is an earnings allocation formula that determines EPS for each class of common stock and participating security. Edison International's participating securities are stock-based compensation awards payable in common shares, including performance shares and restricted stock units, which earn dividend equivalents on an equal basis with common shares once the awards are vested. EPS attributable to Edison International common shareholders was computed as follows:

	Three months ended September 30,				Nine months ended September 30,
(in millions, except per-share amounts)	2017		2016		2017		2016
Basic earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$	470	$	421	$	1,110	$	983
Participating securities dividends	—		—		—		—
Income from continuing operations available to common shareholders	$	470	$	421	$	1,110	$	983
Weighted average common shares outstanding	326		326		326		326
Basic earnings per share – continuing operations	$	1.44	$	1.29	$	3.41	$	3.01
Diluted earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$	470	$	421	$	1,110	$	983
Participating securities dividends	—		—		—		—
Income from continuing operations available to common shareholders	$	470	$	421	$	1,110	$	983
Income impact of assumed conversions	—		—		—		—
Income from continuing operations available to common shareholders and assumed conversions	$	470	$	421	$	1,110	$	983
Weighted average common shares outstanding	326		326		326		326
Incremental shares from assumed conversions	2		4		3		4
Adjusted weighted average shares – diluted	328		330		329		330
Diluted earnings per share – continuing operations	$	1.43	$	1.27	$	3.38	$	2.98

In addition to the participating securities discussed above, Edison International also may award stock options, which are payable in common shares and are included in the diluted earnings per share calculation. Stock option awards to purchase 1,365,671 and 42,890 shares of common stock for the three months ended September 30, 2017 and 2016, respectively, and 1,373,736 and 166,057 shares for the nine months ended September 30, 2017 and 2016, respectively, were outstanding, but were not included in the computation of diluted earnings per share because the effect would have been antidilutive.

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Asset Retirement Obligation

During 2017, SCE recorded revisions to its asset retirement obligation ("ARO") resulting in an increase of $142 million. The revisions resulted from an updated decommissioning cost estimate for Palo Verde and the expected decommissioning of a hydroelectric facility.

New Accounting Guidance

Accounting Guidance Not Yet Adopted

In May 2014, the Financial Accounting Standards Board ("FASB") issued an accounting standards update on revenue recognition and further amended the standard in 2016 and 2017. Under the new standard, revenue is recognized when (or as) a good or service is transferred to the customer and the customer obtains control of the good or service. This standard will be adopted on January 1, 2018. Edison International and SCE have completed the evaluation of all significant revenue streams. Edison International and SCE do not believe the adoption of this standard will have a material impact on the financial position or results of operations. For the nine months ended September 30, 2017, approximately 95% of total operating revenue arises from SCE's tariff offerings that provide electricity to customers. For such arrangements, revenue from contracts with customers will be equivalent to the electricity supplied and billed in that period (including estimated billings). As such, there will not be a change in the timing or pattern of revenue recognition for such sales. Edison International and SCE are in the process of implementing the system and process changes necessary to comply with this standard's enhanced disclosure requirements. Edison International and SCE plan to disaggregate customer contract revenue between revenue from earnings activities and revenue from cost-recovery activities. Some revenue arrangements, such as alternative revenue programs which include balancing account over- and under-collections, are excluded from the scope of the new standard and, therefore, will be accounted for and presented separately from revenues recognized under the new standard on the Edison International and SCE consolidated financial statements. Edison International and SCE will adopt the standard by using the modified retrospective method by recognizing a cumulative effect adjustment to the opening balance of retained earnings on January 1, 2018. Edison International and SCE do not expect the cumulative effect adjustment to be material.

In January 2016, the FASB issued an accounting standards update that amends the guidance on the classification and measurement of financial instruments. The amendments require equity investments (excluding those accounted for under the equity method or those that result in consolidation) to be measured at fair value, with changes in fair value recognized in net income. It also amends certain disclosure requirements associated with the fair value of financial instruments. In addition, the new guidance requires financial assets and financial liabilities to be presented separately in the notes to the financial statements, grouped by measurement category and form of financial asset. Edison International and SCE will adopt this guidance effective January 1, 2018. SCE's nuclear decommissioning trust investments contain equity investments that are classified as available-for-sale. Due to regulatory mechanisms, the change in fair value of these investments has no impact on net income and, therefore, the adoption of this standard is not expected to have a material impact on Edison International's and SCE's consolidated financial statements.

In February 2016, the FASB issued an accounting standards update related to lease accounting including enhanced disclosures. Under the new standard, a lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified assets for a period of time in exchange for consideration. Lessees will need to recognize leases on the balance sheet as a right-of-use asset and a related lease liability, and classify the leases as either operating or finance. The liability will be equal to the present value of lease payments. The asset will be based on the liability, subject to adjustment, such as for initial direct costs. Operating leases will result in straight-line expense while finance leases will result in a higher initial expense pattern due to the interest component. SCE, as a regulated entity, is permitted to continue to have straight-line expense for finance leases, assuming the rate recovery is based upon current payments. Lessees can elect to exclude from the balance sheet short-term contracts one year or less. This guidance is effective January 1, 2019. Early adoption is permitted, but Edison International and SCE do not expect to elect early adoption. The adoption of this standard will increase right-of-use assets and lease liabilities in Edison International's and SCE's consolidated balance sheets. Edison International and SCE are currently evaluating the impact this standard will have on the results of operations and statements of cash flows and lease disclosures.

The FASB also issued an accounting standards update related to the impairment of financial instruments, effective January 1, 2020. The new guidance provides an impairment model, known as the current expected credit loss model, which is based on expected credit losses rather than incurred losses. Edison International and SCE are currently evaluating the impact of this new guidance.

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The FASB also issued accounting standards updates related to the presentation and classification of certain cash receipts and payments in the statement of cash flows, including a change to the amount of cash, cash equivalents, and restricted cash explained when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. These standards are effective January 1, 2018 and require retrospective application. Restricted cash as of September 30, 2017 was $15 million at Edison International and was less than $1 million at SCE.

In January 2017, the FASB issued an accounting standards update to simplify the accounting for goodwill impairment. This accounting standards update changes the procedural steps in applying the goodwill impairment test. A goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. Edison International will apply this guidance to the goodwill impairment test beginning in 2020.

In March 2017, the FASB issued an accounting standards update which amends the current requirements related to the presentation of the components of net periodic benefit cost for an entity's defined benefit pension and other postretirement plans. The adoption of this standard is not expected to have a material impact on Edison International's and SCE's financial position or results of operations, but will result in the separate presentation of service costs as an operating expense and non-service costs within other income and expense and limit the capitalization of benefit costs to the service cost component. During the three and nine months ended September 30, 2017, service costs totaled $45 million and $135 million, respectively, for Edison International and $44 million and $132 million, respectively, for SCE. During the three and nine months ended September 30, 2017, non-service costs were $(14) million and $(32) million, respectively, for Edison International and $(15) million and $(45) million, respectively, for SCE. The new standards update is effective on January 1, 2018. It is required to be applied on a retrospective basis for the presentation of the service cost component and the other components of net benefit cost and on a prospective basis for the capitalization of only the service cost component of net benefit cost.

Note 2.    Consolidated Statements of Changes in Equity

The following table provides Edison International's changes in equity for the nine months ended September 30, 2017:

	Equity Attributable to Common Shareholders											Noncontrolling Interests
(in millions, except per-share amounts)	Common Stock		Accumulated Other Comprehensive Loss			Retained Earnings			Subtotal			Preferred and Preference Stock			Total Equity
Balance at December 31, 2016	$	2,505	$	(53	)	$	9,544		$	11,996		$	2,191		$	14,187
Net income	—		—			1,110			1,110			94			1,204
Other comprehensive income	—		5			—			5			—			5
Common stock dividends declared ($1.6275 per share)	—		—			(530		)	(530		)	—			(530		)
Dividends to noncontrolling interests	—		—			—			—			(94		)	(94		)
Stock-based compensation	—		—			(165		)	(165		)	—			(165		)
Non-cash stock-based compensation	15		—						15			—			15
Issuance of preference stock	—		—			—			—			463			463
Redemption of preference stock	—		—			(15		)	(15		)	(460		)	(475		)
Balance at September 30, 2017	$	2,520	$	(48	)	$	9,944		$	12,416		$	2,194		$	14,610

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The following table provides Edison International's changes in equity for the nine months ended September 30, 2016:

	Equity Attributable to Common Shareholders													Noncontrolling Interests
(in millions, except per-share amounts)	Common Stock			Accumulated Other Comprehensive Loss			Retained Earnings				Subtotal			Preferred and Preference Stock			Total Equity
Balance at December 31, 2015	$	2,484		$	(56	)	$	8,940			$	11,368		$	2,020		$	13,388
Net income	—			—			982			1	982			92			1,074
Other comprehensive income	—			5			—				5			—			5
Common stock dividends declared ($1.4400 per share)	—			—			(469		)		(469		)	—			(469		)
Dividends to noncontrolling interests	—			—			—				—			(92		)	(92		)
Stock-based compensation	(1		)	—			(30		)	1	(31		)	—			(31		)
Non-cash stock-based compensation	18			—			—				18			—			18
Issuance of preference stock	—			—			—				—			294			294
Redemption of preference stock	—			—			(2		)		(2		)	(123		)	(125		)
Balance at September 30, 2016	$	2,501		$	(51	)	$	9,421			$	11,871		$	2,191		$	14,062

¹   Edison International adopted an accounting standard related to share-based payments during the fourth quarter of 2016, effective January 1, 2016. See Note 1 for further information. The table above reflects the adoption of this standard on January 1, 2016. Net income and stock-based compensation (as previously reported) were $965 million and $(72) million, respectively, for the nine months ended September 30, 2016.

The following table provides SCE's changes in equity for the nine months ended September 30, 2017:

	Equity Attributable to Edison International
(in millions)	Common Stock		Additional Paid-in Capital			Accumulated Other Comprehensive Loss			Retained Earnings			Preferred and Preference Stock			Total Equity
Balance at December 31, 2016	$	2,168	$	657		$	(20	)	$	9,433		$	2,245		$	14,483
Net income	—		—			—			1,215			—			1,215
Other comprehensive income	—		—			2			—			—			2
Dividends declared on common stock	—		—			—			(573		)	—			(573		)
Dividends declared on preferred and preference stock	—		—			—			(94		)	—			(94		)
Stock-based compensation	—		—			—			(36		)	—			(36		)
Non-cash stock-based compensation	—		8			—			—			—			8
Issuance of preference stock	—		(12		)	—			—			475			463
Redemption of preference stock	—		15			—			(15		)	(475		)	(475		)
Balance at September 30, 2017	$	2,168	$	668		$	(18	)	$	9,930		$	2,245		$	14,993

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The following table provides SCE's changes in equity for the nine months ended September 30, 2016:

	Equity Attributable to Edison International
(in millions)	Common Stock		Additional Paid-in Capital			Accumulated Other Comprehensive Loss			Retained Earnings				Preferred and Preference Stock			Total Equity
Balance at December 31, 2015	$	2,168	$	652		$	(22	)	$	8,804			$	2,070		$	13,672
Net income	—		—			—			1,140			1	—			1,140
Other comprehensive income	—		—			3			—				—			3
Dividends declared on common stock	—		—			—			(510		)		—			(510		)
Dividends declared on preferred and preference stock	—		—			—			(92		)		—			(92		)
Stock-based compensation	—		—			—			(43		)	1	—			(43		)
Non-cash stock-based compensation	—		8			—			—				—			8
Issuance of preference stock	—		(6		)	—			—				300			294
Redemption of preference stock	—		2			—			(2		)		(125		)	(125		)
Balance at September 30, 2016	$	2,168	$	656		$	(19	)	$	9,297			$	2,245		$	14,347

¹   SCE adopted an accounting standard related to share-based payments during the fourth quarter of 2016, effective January 1, 2016. See Note 1 for further information. The table above reflects the adoption of this standard on January 1, 2016. Net income and stock-based compensation (as previously reported) were $1.13 billion and $(49) million, respectively, for the nine months ended September 30, 2016.

Note 3.    Variable Interest Entities

A VIE is defined as a legal entity that meets one of two conditions: (1) the equity owners do not have sufficient equity at risk, or (2) the holders of the equity investment at risk, as a group, lack any of the following three characteristics: decision-making rights, the obligation to absorb losses, or the right to receive the expected residual returns of the entity. The primary beneficiary is identified as the variable interest holder that has both the power to direct the activities of the VIE that most significantly impact the entity's economic performance and the obligation to absorb losses or the right to receive benefits from the entity that could potentially be significant to the VIE. The primary beneficiary is required to consolidate the VIE. A subsidiary of Edison International is the primary beneficiary of entities that own rooftop solar projects. Commercial and operating activities are generally the factors that most significantly impact the economic performance of such VIEs. Commercial and operating activities include construction, operation and maintenance, fuel procurement, dispatch, and compliance with regulatory and contractual requirements.

Variable Interest in VIEs that are not Consolidated

Power Purchase Agreements

SCE has power purchase agreements ("PPAs") that are classified as variable interests in VIEs, including tolling agreements through which SCE provides the natural gas to fuel the plants and contracts with qualifying facilities that contain variable pricing provisions based on the price of natural gas. SCE has concluded that it is not the primary beneficiary of these VIEs since it does not control the commercial and operating activities of these entities. Since payments for capacity are the primary source of income, the most significant economic activity for these VIEs is the operation and maintenance of the power plants.

As of the balance sheet date, the carrying amount of assets and liabilities in SCE's consolidated balance sheet that relate to its involvement with VIEs result from amounts due under the PPAs. Under these contracts, SCE recovers the costs incurred through demonstration of compliance with its California Public Utilities Commission ("CPUC")-approved long-term power procurement plans. SCE has no residual interest in the entities and has not provided or guaranteed any debt or equity support, liquidity arrangements, performance guarantees, or other commitments associated with these contracts other than the purchase commitments described in Note 11 of the 2016 Form 10-K. As a result, there is no significant potential exposure to loss to SCE from its variable interest in these VIEs. The aggregate contracted capacity dedicated to SCE from these VIE projects was 4,858 MW and 4,349 MW at September 30, 2017 and 2016, respectively, and the amounts that SCE paid to these projects were $325 million and $313 million for the three months ended September 30, 2017 and 2016, respectively, and $571 million and $532 million for nine months ended September 30, 2017 and 2016, respectively. These amounts are recoverable in customer rates, subject to reasonableness review.

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Unconsolidated Trusts of SCE

SCE Trust I, Trust II, Trust III, Trust IV, Trust V, and Trust VI were formed in 2012, 2013, 2014, 2015, 2016, and 2017, respectively, for the exclusive purpose of issuing the 5.625%, 5.10%, 5.75%, 5.375%, 5.45%, and 5.00% trust preference securities, respectively ("trust securities"). The trusts are VIEs. SCE has concluded that it is not the primary beneficiary of these VIEs as it does not have the obligation to absorb the expected losses or the right to receive the expected residual returns of the trusts. SCE Trust I, Trust II, Trust III, Trust IV, Trust V and Trust VI issued to the public trust securities in the face amounts of $475 million, $400 million, $275 million, $325 million, $300 million, and $475 million (cumulative, liquidation amounts of $25 per share), respectively, and $10,000 of common stock each to SCE. The trusts invested the proceeds of these trust securities in Series F, Series G, Series H, Series J, Series K, and Series L Preference Stock issued by SCE in the principal amounts of $475 million, $400 million, $275 million, $325 million, $300 million, and $475 million (cumulative, $2,500 per share liquidation values), respectively, which have substantially the same payment terms as the respective trust securities.

The Series F, Series G, Series H, Series J, Series K, and Series L Preference Stock and the corresponding trust securities do not have a maturity date. Upon any redemption of any shares of the Series F, Series G, Series H, Series J, Series K, or Series L Preference Stock, a corresponding dollar amount of trust securities will be redeemed by the applicable trust. The applicable trust will make distributions at the same rate and on the same dates on the applicable series of trust securities if and when the SCE board of directors declares and makes dividend payments on the related Preference Stock. The applicable trust will use any dividends it receives on the related Preference Stock to make its corresponding distributions on the applicable series of trust securities. If SCE does not make a dividend payment to any of these trusts, SCE would be prohibited from paying dividends on its common stock. SCE has fully and unconditionally guaranteed the payment of the trust securities and trust distributions, if and when SCE pays dividends on the related Preference Stock.

In July 2017, SCE Trust I redeemed $475 million of trust securities from the public and $10,000 of common stock from SCE. As a result in September 2017, SCE Trust I was terminated. The Trust II, Trust III, Trust IV, and Trust V balance sheets as of September 30, 2017 and December 31, 2016, consisted of investments of $400 million, $275 million, $325 million, and $300 million in the Series G, Series H, Series J, and Series K Preference Stock, respectively, $400 million, $275 million, $325 million, and $300 million of trust securities, respectively, and $10,000 each of common stock. The Trust VI balance sheet as of September 30, 2017 consisted of investments of $475 million in the Series L Preference Stock, $475 million of trust securities, and $10,000 of common stock.

The following table provides a summary of the trusts' income statements:

	Three months ended September 30,
(in millions)	Trust I		Trust II		Trust III		Trust IV		Trust V		Trust VI
2017
Dividend income	$	1	$	5	$	4	$	4	$	4	$	6
Dividend distributions	1		5		4		4		4		6
2016
Dividend income	$	7	$	5	$	4	$	4	$	4	*
Dividend distributions	7		5		4		4		4		*

	Nine months ended September 30,
(in millions)	Trust I		Trust II		Trust III		Trust IV		Trust V		Trust VI
2017
Dividend income	$	14	$	15	$	12	$	13	$	12	$	6
Dividend distributions	14		15		12		13		12		6
2016
Dividend income	$	20	$	15	$	12	$	13	$	9	*
Dividend distributions	20		15		12		13		9		*

* Not applicable.

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Note 4.    Fair Value Measurements

Recurring Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (referred to as an "exit price"). Fair value of an asset or liability considers assumptions that market participants would use in pricing the asset or liability, including assumptions about nonperformance risk. As of September 30, 2017 and December 31, 2016, nonperformance risk was not material for Edison International and SCE.

Assets and liabilities are categorized into a three-level fair value hierarchy based on valuation inputs used to determine fair value.

Level 1 – The fair value of Edison International's and SCE's Level 1 assets and liabilities is determined using unadjusted quoted prices in active markets that are available at the measurement date for identical assets and liabilities. This level includes exchange-traded equity securities, U.S. treasury securities, mutual funds, and money market funds.

Level 2 – Edison International's and SCE's Level 2 assets and liabilities include fixed income securities, primarily consisting of U.S. government and agency bonds, municipal bonds and corporate bonds, and over-the-counter derivatives. The fair value of fixed income securities is determined using a market approach by obtaining quoted prices for similar assets and liabilities in active markets and inputs that are observable, either directly or indirectly, for substantially the full term of the instrument.

The fair value of SCE's over-the-counter derivative contracts is determined using an income approach. SCE uses standard pricing models to determine the net present value of estimated future cash flows. Inputs to the pricing models include forward published or posted clearing prices from exchanges (New York Mercantile Exchange and Intercontinental Exchange) for similar instruments and discount rates. A primary price source that best represents trade activity for each market is used to develop observable forward market prices in determining the fair value of these positions. Broker quotes, prices from exchanges, or comparison to executed trades are used to validate and corroborate the primary price source. These price quotations reflect mid-market prices (average of bid and ask) and are obtained from sources believed to provide the most liquid market for the commodity.

Level 3 – The fair value of SCE's Level 3 assets and liabilities is determined using the income approach through various models and techniques that require significant unobservable inputs. This level includes derivative contracts that trade infrequently such as congestion revenue rights ("CRRs"). Edison International Parent and Other does not have any Level 3 assets and liabilities.

Assumptions are made in order to value derivative contracts in which observable inputs are not available. In circumstances where fair value cannot be verified with observable market transactions, it is possible that a different valuation model could produce a materially different estimate of fair value. Modeling methodologies, inputs, and techniques are reviewed and assessed as markets continue to develop and more pricing information becomes available and the fair value is adjusted when it is concluded that a change in inputs or techniques would result in a new valuation that better reflects the fair value of those derivative contracts. See Note 6 for a discussion of derivative instruments.

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SCE

The following table sets forth assets and liabilities of SCE that were accounted for at fair value by level within the fair value hierarchy:

	September 30, 2017
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral1		Total
Assets at fair value
Derivative contracts	$	—	$	14	$	24	$	—	$	38
Other	36		—		—		—		36
Nuclear decommissioning trusts:
Stocks2	1,655		—		—		—		1,655
Fixed Income3	1,057		1,588		—		—		2,645
Short-term investments, primarily cash equivalents	34		109		—		—		143
Subtotal of nuclear decommissioning trusts4	2,746		1,697		—		—		4,443
Total assets	2,782		1,711		24		—		4,517
Liabilities at fair value
Derivative contracts	—		1		2		—		3
Total liabilities	—		1		2		—		3
Net assets	$	2,782	$	1,710	$	22	$	—	$	4,514

	December 31, 2016
(in millions)	Level 1		Level 2		Level 3			Netting and Collateral1		Total
Assets at fair value
Derivative contracts	$	—	$	6	$	68		$	—	$	74
Other	33		—		—			—		33
Nuclear decommissioning trusts:
Stocks2	1,547		—		—			—		1,547
Fixed Income3	865		1,751		—			—		2,616
Short-term investments, primarily cash equivalents	36		170		—			—		206
Subtotal of nuclear decommissioning trusts4	2,448		1,921		—			—		4,369
Total assets	2,481		1,927		68			—		4,476
Liabilities at fair value
Derivative contracts	—		—		1,157			—		1,157
Total liabilities	—		—		1,157			—		1,157
Net assets (liabilities)	$	2,481	$	1,927	$	(1,089	)	$	—	$	3,319

¹  Represents the netting of assets and liabilities under master netting agreements and cash collateral across the levels of the fair value hierarchy. Netting among positions classified within the same level is included in that level.

²  Approximately 69% and 70% of SCE's equity investments were located in the United States at September 30, 2017 and December 31, 2016, respectively.

³  Includes corporate bonds, which were diversified and included collateralized mortgage obligations and other asset backed securities of $80 million and $79 million at September 30, 2017 and December 31, 2016, respectively.

⁴  Excludes net payables of $28 million and $127 million at September 30, 2017 and December 31, 2016, respectively, which consist of interest and dividend receivables as well as receivables and payables related to SCE's pending securities sales and purchases.

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Edison International Parent and Other

Edison International Parent and Other assets measured at fair value consisted of money market funds of $24 million and $23 million at September 30, 2017 and December 31, 2016, respectively, classified as Level 1.

SCE Fair Value of Level 3

The following table sets forth a summary of changes in SCE's fair value of Level 3 net derivative assets and liabilities:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Fair value of net liabilities at beginning of period	$	(1,012	)	$	(1,170	)	$	(1,089	)	$	(1,148	)
Total realized/unrealized gains (losses):
Included in regulatory assets and liabilities1	120			8			54			(14		)
Settlements	—			(1		)	—			(1		)
Contract amendment2	—			—			143			—
Normal purchase and normal sale designation3	$	914		$	—		$	914		$	—
Fair value of net assets (liabilities) at end of period	$	22		$	(1,163	)	$	22		$	(1,163	)
Change during the period in unrealized gains and losses related to assets and liabilities held at the end of the period	$	6		$	(57	)	$	6		$	(122	)

¹  Due to regulatory mechanisms, SCE's realized and unrealized gains and losses are recorded as regulatory assets and liabilities.

² Represents a tolling contract that was amended during the second quarter of 2017, which is no longer accounted for as a derivative as of September 30, 2017.

³  During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

Edison International and SCE recognize the fair value for transfers in and transfers out of each level at the end of each reporting period. There were no material transfers between any levels during 2017 and 2016.

Valuation Techniques Used to Determine Fair Value

The process of determining fair value is the responsibility of SCE's risk management department, which reports to SCE's chief financial officer. This department obtains observable and unobservable inputs through broker quotes, exchanges, and internal valuation techniques that use both standard and proprietary models to determine fair value. Each reporting period, the risk and finance departments collaborate to determine the appropriate fair value methodologies and classifications for each derivative. Inputs are validated for reasonableness by comparison against prior prices, other broker quotes, and volatility fluctuation thresholds. Inputs used and valuations are reviewed period-over-period and compared with market conditions to determine reasonableness.

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The following table sets forth SCE's valuation techniques and significant unobservable inputs used to determine fair value for significant Level 3 assets and liabilities:

	Fair Value (in millions)					Significant	Range
	Assets		Liabilities		Valuation Technique(s)	Unobservable Input	(Weighted Average)
Congestion revenue rights
September 30, 2017	$	24	$	—	Market simulation model and auction prices	Load forecast	3,708 MW - 22,840 MW
						Power prices1	$3.65 - $99.58
						Gas prices2	$2.51 - $4.87
December 31, 2016	67		—		Market simulation model and auction prices	Load forecast	3,708 MW - 22,840 MW
						Power prices1	$3.65 - $99.58
						Gas prices2	$2.51 - $4.87
Tolling3
December 31, 2016	—		1,154		Option model	Volatility of gas prices	15% - 48% (20%)
						Volatility of power prices	29% - 71% (40%)
						Power prices	$23.40 - $51.24 ($34.70)

¹  Prices are in dollars per megawatt-hour.

²  Prices are in dollars per million British thermal units.

³ During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

Level 3 Fair Value Sensitivity

Congestion Revenue Rights

For CRRs, where SCE is the buyer, generally increases (decreases) in forecasted load in isolation would result in increases (decreases) to the fair value. In general, an increase (decrease) in electricity and gas prices at illiquid locations tends to result in increases (decreases) to fair value; however, changes in electricity and gas prices in opposite directions may have varying results on fair value.

Nuclear Decommissioning Trusts

SCE's nuclear decommissioning trust investments include equity securities, U.S. treasury securities, and other fixed income securities. Equity and treasury securities are classified as Level 1 as fair value is determined by observable market prices in active or highly liquid and transparent markets. The remaining fixed income securities are classified as Level 2. The fair value of these financial instruments is based on evaluated prices that reflect significant observable market information such as reported trades, actual trade information of similar securities, benchmark yields, broker/dealer quotes, issuer spreads, bids, offers, and relevant credit information. There are no securities classified as Level 3 in the nuclear decommissioning trusts.

Fair Value of Debt Recorded at Carrying Value

The carrying value and fair value of Edison International's and SCE's long-term debt (including current portion of long-term debt) are as follows:

	September 30, 2017				December 31, 2016
(in millions)	Carrying Value1		Fair Value		Carrying Value1		Fair Value
SCE	$	11,005	$	12,554	$	10,333	$	11,539
Edison International	12,221		13,788		11,156		12,368

¹   Carrying value is net of debt issuance costs.

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The fair value of Edison International's and SCE's short-term and long-term debt is classified as Level 2 and is based on evaluated prices that reflect significant observable market information such as reported trades, actual trade information of similar securities, benchmark yields, broker/dealer quotes of new issue prices, and relevant credit information.

The carrying value of Edison International's and SCE's trade receivables and payables, other investments, and short-term debt approximates fair value.

Note 5.    Debt and Credit Agreements

Long-Term Debt

During the first quarter of 2017, SCE borrowed $300 million under a Term Loan Agreement due July 2018, with a variable interest rate based on the London Interbank Offered Rate plus 65 basis points. The proceeds were used for general corporate purposes.

During the first quarter of 2017, SCE reissued $135 million of 2.625% pollution-control bonds subject to mandatory remarketing in December 2023. The proceeds were used for general corporate purposes.

During the first quarter of 2017 and in September 2017, SCE issued $700 million and $300 million, respectively, of 4.00% first and refunding mortgage bonds due in 2047. The aggregate principal amount of these bonds totaled $1.0 billion and the proceeds from the first quarter issuance were used to repay commercial paper borrowings, to fund SCE's capital program and for general corporate purposes. The proceeds from the September 2017 issuance were used to repay the $300 million Term Loan Agreement discussed above.

During the first quarter of 2017, Edison International issued $400 million of 2.125% senior notes due in 2020. The proceeds were used to repay commercial paper borrowings and for general corporate purposes. In August 2017, Edison International issued $400 million of 2.40% senior notes due in 2022. In September 2017, the proceeds from the August 2017 issuance were used to repay $400 million of Edison International's 3.75% senior notes.

Project Financings

In October 2017, indirect subsidiaries of Edison Energy Group entered into approximately $100 million in non-recourse debt and tax equity financings to support investments in ground mount solar projects. The tax equity investor in these solar projects will receive an initial allocation of 99% of taxable losses and tax credits, followed by 67% of taxable income and losses after the initial period and 15.6% of cash flows until certain conditions are met, including attaining a specified rate of return.  A subsidiary of Edison Energy Group has the option after certain conditions are met to purchase the tax equity investor's interest at the higher of fair value or the after-tax amount necessary to achieve a specified 20-year rate of return.

Credit Agreements and Short-Term Debt

SCE and Edison International Parent have multi-year revolving credit facilities of $2.75 billion and $1.25 billion, respectively. During the third quarter of 2017, SCE and Edison International Parent extended the maturity date to July 2022. SCE's credit facility is generally used to support commercial paper borrowings and letters of credit issued for procurement-related collateral requirements, balancing account undercollections and for general corporate purposes, including working capital requirements to support operations and capital expenditures. Edison International Parent's credit facility is used to support commercial paper borrowings and for general corporate purposes.

At September 30, 2017, SCE's outstanding commercial paper, net of discount, was $329 million at a weighted-average interest rate of 1.29%. At September 30, 2017, letters of credit issued under SCE's credit facility aggregated $267 million and are scheduled to expire in twelve months or less. At December 31, 2016, the outstanding commercial paper, net of discount, was $769 million at a weighted-average interest rate of 0.9%.

At September 30, 2017, Edison International Parent's outstanding commercial paper, net of discount, was $573 million at a weighted-average interest rate of 1.37%. At December 31, 2016, the outstanding commercial paper, net of discount, was $538 million at a weighted-average interest rate of 0.97%.

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Note 6.    Derivative Instruments

Derivative financial instruments are used to manage exposure to commodity price risk. These risks are managed in part by entering into forward commodity transactions, including options, swaps, and futures. To mitigate credit risk from counterparties in the event of nonperformance, master netting agreements are used whenever possible and counterparties may be required to pledge collateral depending on the creditworthiness of each counterparty and the risk associated with the transaction.

Commodity Price Risk

Commodity price risk represents the potential impact that can be caused by a change in the market value of a particular commodity. SCE's electricity price exposure arises from energy purchased from and sold to wholesale markets as a result of differences between SCE's load requirements and the amount of energy delivered from its generating facilities and PPAs. SCE's natural gas price exposure arises from natural gas purchased for the Mountainview power plant and peaker plants, qualifying facility contracts where pricing is based on a monthly natural gas index, and PPAs in which SCE has agreed to provide the natural gas needed for generation, referred to as tolling arrangements.

Credit and Default Risk

Credit and default risk represent the potential impact that can be caused if a counterparty were to default on its contractual obligations and SCE would be exposed to spot markets for buying replacement power or selling excess power. In addition, SCE would be exposed to the risk of non-payment of accounts receivable, primarily related to the sales of excess power and realized gains on derivative instruments.

Certain power contracts contain master netting agreements or similar agreements, which generally allow counterparties subject to the agreement to offset amounts when certain criteria are met, such as in the event of default. The objective of netting is to reduce credit exposure. Additionally, to reduce SCE's risk exposures counterparties may be required to pledge collateral depending on the creditworthiness of each counterparty and the risk associated with the transaction.

Certain power contracts contain a provision that requires SCE to maintain an investment grade rating from each of the major credit rating agencies, referred to as a credit-risk-related contingent feature. If SCE's credit rating were to fall below investment grade, SCE may be required to post additional collateral to cover derivative liabilities and the related outstanding payables. The net fair value of all derivative liabilities with these credit-risk-related contingent features was $2 million and $12 million as of September 30, 2017 and December 31, 2016, respectively, for which SCE has posted $15 million and $12 million collateral at September 30, 2017 and December 31, 2016, respectively, to its counterparties for its derivative liabilities and related outstanding payables. If the credit-risk-related contingent features underlying these agreements were triggered on September 30, 2017, SCE would be required to post $15 million of additional collateral of which $13 million is related to outstanding payables that are net of collateral already posted.

Fair Value of Derivative Instruments

SCE presents its derivative assets and liabilities on a net basis on its consolidated balance sheets when subject to master netting agreements or similar agreements. Derivative positions are offset against margin and cash collateral deposits. In addition, SCE has provided collateral in the form of letters of credit. Collateral requirements can vary depending upon the level of unsecured credit extended by counterparties, changes in market prices relative to contractual commitments, and other factors. See Note 4 for a discussion of fair value of derivative instruments. The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:

	September 30, 2017
	Derivative Assets								Derivative Liabilities								Net Asset
(in millions)	Short-Term			Long-Term		Subtotal			Short-Term			Long-Term		Subtotal2
Commodity derivative contracts
Gross amounts recognized	$	37		$	2	$	39		$	4		$	—	$	4		$	35
Gross amounts offset in the consolidated balance sheets	(1		)	—		(1		)	(1		)	—		(1		)	—
Cash collateral posted1	—			—		—			—			—		—			—
Net amounts presented in the consolidated balance sheets	$	36		$	2	$	38		$	3		$	—	$	3		$	35

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	December 31, 2016
	Derivative Assets								Derivative Liabilities								Net Liability
(in millions)	Short-Term			Long-Term		Subtotal			Short-Term			Long-Term		Subtotal
Commodity derivative contracts
Gross amounts recognized	$	74		$	1	$	75		$	217		$	941	$	1,158		$	1,083
Gross amounts offset in the consolidated balance sheets	(1		)	—		(1		)	(1		)	—		(1		)	—
Cash collateral posted1	—			—		—			—			—		—			—
Net amounts presented in the consolidated balance sheets	$	73		$	1	$	74		$	216		$	941	$	1,157		$	1,083

¹  In addition, at September 30, 2017 and December 31, 2016, SCE had received $1 million and $2 million, respectively, of collateral that is not offset against derivative assets and is reflected in "Other current liabilities" on the consolidated balance sheets.

²  During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

Income Statement Impact of Derivative Instruments

SCE recognizes realized gains and losses on derivative instruments as purchased power expense and expects that such gains or losses will be part of the purchased power costs recovered from customers. As a result, realized gains and losses do not affect earnings, but may temporarily affect cash flows. Due to expected future recovery from customers, unrealized gains and losses are recorded as regulatory assets and liabilities and therefore also do not affect earnings. The remaining effects of derivative activities and related regulatory offsets are recorded in cash flows from operating activities in the consolidated statements of cash flows.

The following table summarizes the components of SCE's economic hedging activity:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Realized losses	$	(3	)	$	(1	)	$	(8	)	$	(53	)
Unrealized gains (losses)	116			(2		)	37			6

Notional Volumes of Derivative Instruments

The following table summarizes the notional volumes of derivatives used for SCE hedging activities:

		Economic Hedges
Commodity	Unit of Measure	September 30, 2017	December 31, 2016
Electricity options, swaps and forwards	GWh	874	1,816
Natural gas options, swaps and forwards	Bcf	137	36
Congestion revenue rights	GWh	74,849	93,319
Tolling arrangements	GWh	—	61,093

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Note 7.    Income Taxes

Effective Tax Rate

The table below provides a reconciliation of income tax expense computed at the federal statutory income tax rate to the income tax provision:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Edison International:
Income from continuing operations before income taxes	$	432		$	571		$	1,119		$	1,162
Provision for income tax at federal statutory rate of 35%	151			200			392			407
Increase in income tax from:
State tax, net of federal benefit	7			20			23			30
Property-related1	(201		)	(79		)	(396		)	(296		)
Change related to uncertain tax positions	—			(5		)	(17		)	(4		)
Shared-based compensation2	(4		)	(2		)	(50		)	(17		)
Other	(22		)	(14		)	(35		)	(24		)
Total income tax (benefit) expense from continuing operations	$	(69	)	$	120		$	(83	)	$	96
Effective tax rate	(16.0		)%	21.0		%	(7.4		)%	8.3		%
SCE:
Income from continuing operations before income taxes	$	462		$	607		$	1,249		$	1,291
Provision for income tax at federal statutory rate of 35%	162			212			437			452
Increase in income tax from:
State tax, net of federal benefit	12			25			34			40
Property-related1	(201		)	(79		)	(396		)	(296		)
Change related to uncertain tax positions	(1		)	(7		)	(13		)	(9		)
Shared-based compensation2	(1		)	—			(10		)	(11		)
Other	(6		)	(10		)	(18		)	(25		)
Total income tax (benefit) expense from continuing operations	$	(35	)	$	141		$	34		$	151
Effective tax rate	(7.6		)%	23.2		%	2.7		%	11.7		%

¹   Includes incremental tax benefits related to repair deductions and tax accounting method changes which are required to be flowed back to customers. During the third quarter of 2017, SCE recorded $70 million ($118 million pre-tax) of tax benefits related to tax accounting method changes resulting from the filing of SCE's 2016 tax returns. During the second quarter of 2016, SCE recorded $79 million ($133 million pre-tax) for 2012 – 2014 incremental tax benefits related to repair deductions.

²  Includes state taxes for Edison International and SCE of $10 million and $2 million, respectively, for the nine months ended September 30, 2017. Includes state taxes for Edison International and SCE of $3 million and $2 million, respectively, for the nine months ended September 30, 2016. Refer to Note 1 for further information.

The CPUC requires flow-through ratemaking treatment for the current tax benefit arising from certain property-related and other temporary differences which reverse over time. Flow-through items reduce current authorized revenue requirements in SCE's rate cases and result in a regulatory asset for recovery of deferred income taxes in future periods. The difference between the authorized amounts as determined in SCE's rate cases, adjusted for balancing and memorandum account activities, and the recorded flow-through items also result in increases or decreases in regulatory assets with a corresponding impact on the effective tax rate to the extent that recorded deferred amounts are expected to be recovered in future rates. For further information, see Note 10.

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In March 2017, SCE received the final decision on claims against, and counterclaims of, Mitsubishi Heavy Industries, Inc. and related companies (together, "MHI") from the arbitration tribunal, the International Chamber of Commerce, discussed further in Note 11. San Onofre was permanently shut down on June 7, 2013 as a result of failure of replacement steam generators supplied by MHI. With the resolution of the insurance claim against Nuclear Electric Insurance Limited ("NEIL") in October 2015 and the conclusion of the arbitration proceeding against MHI, a tax abandonment loss of $691 million and $1.13 billion for federal and state income tax purposes, respectively, was claimed in the first six months of 2017, resulting in a flow-through tax benefit of approximately $39 million impacting the effective tax rate. Due to the tax abandonment loss recognized during the first nine months of 2017, Edison International and SCE both expect to report federal and California tax losses in 2017.

Unrecognized Tax Benefits

In the first quarter of 2017, Edison International settled all open tax positions with the Internal Revenue Service ("IRS") for taxable years 2007 through 2012. The following table provides a reconciliation of unrecognized tax benefits for 2017 as a result of the audit settlement:

(in millions)	Edison International			SCE
Balance at January 1, 2017	$	471		$	371
Tax positions taken during the current year:
Increases	39			39
Tax positions taken during a prior year:
Increases	1			1
Decreases	(5		)	(4		)
Decreases for settlements during the period	(83		)	(78		)
Balance at September 30, 2017	$	423		$	329

Tax Disputes

In the first quarter of 2017, Edison International settled all open tax positions with the IRS for taxable years 2007 through 2012. Edison International has previously made cash deposits to cover the estimated tax and interest liability from this audit cycle and expects a $7 million refund of this deposited amount.

Tax years that remain open for examination by the IRS and the California Franchise Tax Board are 2014 – 2016 and 2010 – 2016, respectively. Edison International has settled all open tax position with the IRS for taxable years prior to 2013. 

Tax years 1994 – 2006 are currently in settlement negotiations with the California Franchise Tax Board. While we expect to resolve these tax years within the next twelve months, the impacts cannot be reasonably estimated until further progress has been made. Tax years 2007 – 2009 are currently under protest with the California Franchise Tax Board.

Note 8.    Compensation and Benefit Plans

Pension Plans

Edison International made contributions of $100 million during the nine months ended September 30, 2017, which includes contributions of $64 million by SCE. Edison International expects to make contributions of $15 million during the remainder of 2017, which includes $1 million from SCE. Annual contributions made by SCE to most of SCE's pension plans are anticipated to be recovered through CPUC-approved regulatory mechanisms.

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Net periodic pension expense components for continuing operations are:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Edison International:
Service cost	$	36		$	39		$	108		$	117
Interest cost	41			44			123			132
Expected return on plan assets	(53		)	(56		)	(159		)	(168		)
Settlement costs1	—			—			8			—
Amortization of prior service cost	—			1			2			3
Amortization of net loss2	4			9			14			27
Expense under accounting standards	$	28		$	37		$	96		$	111
Regulatory adjustment	(3		)	(9		)	(9		)	(27		)
Total expense recognized	$	25		$	28		$	87		$	84
SCE:
Service cost	$	35		$	38		$	105		$	114
Interest cost	37			41			111			123
Expected return on plan assets	(50		)	(53		)	(150		)	(159		)
Amortization of prior service cost	—			1			2			3
Amortization of net loss2	4			8			12			24
Expense under accounting standards	$	26		$	35		$	80		$	105
Regulatory adjustment	(3		)	(9		)	(9		)	(27		)
Total expense recognized	$	23		$	26		$	71		$	78

¹  Under GAAP, a settlement is recorded when lump-sum payments exceed estimated annual service and interest costs. Lump sum payments made in April 2017 to Edison International executives retiring in 2016 from the Executive Retirement Plan exceeded the estimated service and interest costs, resulting in a partial settlement of that plan. A settlement loss of approximately $7.7 million ($4.6 million after-tax) was recorded at Edison International in the second quarter of 2017.

²  Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $3 million and $1 million, respectively, for the three months ended September 30, 2017, and $8 million and $4 million, respectively, for the nine months ended September 30, 2017. The amount reclassified for Edison International and SCE was $3 million and $2 million, respectively, for the three months ended September 30, 2016, and $9 million and $5 million, respectively, for the nine months ended September 30, 2016.

Postretirement Benefits Other Than Pensions

Edison International made contributions of $16 million during the nine months ended September 30, 2017 and expects to make contributions of $5 million during the remainder of 2017, substantially all of which are expected to be made by SCE. Annual contributions related to SCE employees made to SCE plans are anticipated to be recovered through CPUC-approved regulatory mechanisms and are expected to be, at a minimum, equal to the total annual expense for these plans. Benefits under these plans, with some exceptions, are generally unvested and subject to change. Under the terms of the Edison International Health and Welfare Plan ("PBOP Plan") each participating employer (Edison International or its participating subsidiaries) is responsible for the costs and expenses of all PBOP Plan benefits with respect to its employees and former employees. A participating employer may terminate the PBOP Plan benefits with respect to its employees and former employees, as may SCE (as PBOP Plan sponsor), and, accordingly, the participants' PBOP Plan benefits are not vested benefits.

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Net periodic PBOP expense components for continuing operations are:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Edison International:
Service cost	$	9		$	10		$	27		$	30
Interest cost	24			26			72			78
Expected return on plan assets	(27		)	(28		)	(81		)	(84		)
Amortization of prior service cost	—			(1		)	(2		)	(3		)
Total expense	$	6		$	7		$	16		$	21
SCE:
Service cost	$	9		$	10		$	27		$	30
Interest cost	24			26			72			78
Expected return on plan assets	(27		)	(28		)	(81		)	(84		)
Amortization of prior service cost	—			(1		)	(2		)	(3		)
Total expense	$	6		$	7		$	16		$	21

Note 9.    Investments

Nuclear Decommissioning Trusts

Future decommissioning costs related to SCE's nuclear assets are expected to be funded from independent decommissioning trusts.

The following table sets forth amortized cost and fair value of the trust investments (see Note 4 for a discussion of fair value of the trust investments):

	Longest Maturity Dates	Amortized Cost				Fair Value
(in millions)		September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Stocks	—	$	290	$	319	$	1,655	$	1,547
Municipal bonds	2054	612		659		738		766
U.S. government and agency securities	2067	1,220		1,131		1,298		1,191
Corporate bonds	2057	545		600		609		659
Short-term investments and receivables/payables1	One-year	111		75		115		79
Total		$	2,778	$	2,784	$	4,415	$	4,242

¹ Short-term investments include $114 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 4, 2017 as of December 31, 2016. No repurchase agreements were held as of September 30, 2017.

Trust fund earnings (based on specific identification) increase the trust fund balance and the asset retirement obligation ("ARO") regulatory liability. Unrealized holding gains, net of losses, were $1.6 billion and $1.5 billion at September 30, 2017 and December 31, 2016, respectively.

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The following table sets forth a summary of changes in the fair value of the trust:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Balance at beginning of period	$	4,381		$	4,344		$	4,242		$	4,331
Gross realized gains	22			18			134			61
Gross realized losses	(3		)	(1		)	(19		)	(5		)
Unrealized gains, net of losses	65			32			179			153
Other-than-temporary impairments	(2		)	(2		)	(6		)	(10		)
Interest and dividends	28			28			87			88
Income taxes	(9		)	(5		)	(35		)	(47		)
Decommissioning disbursements	(65		)	(38		)	(164		)	(192		)
Administrative expenses and other	(2		)	—			(3		)	(3		)
Balance at end of period	$	4,415		$	4,376		$	4,415		$	4,376

Trust assets are used to pay income taxes. Deferred tax liabilities related to net unrealized gains at September 30, 2017 were $402 million. Accordingly, the fair value of trust assets available to pay future decommissioning costs, net of deferred income taxes, totaled $4.0 billion at September 30, 2017. Due to regulatory mechanisms, changes in assets of the trusts from income or loss items have no impact on operating revenue or earnings.

Decommissioning disbursements are funded from sales of investments of the nuclear decommissioning trusts.

Note 10.    Regulatory Assets and Liabilities

Regulatory Assets

SCE's regulatory assets included on the consolidated balance sheets are:

(in millions)	September 30, 2017		December 31, 2016
Current:
Regulatory balancing accounts	$	216	$	135
Energy derivatives and other power contracts	203		150
Unamortized investments, net of accumulated amortization	12		49
Other	14		16
Total current	445		350
Long-term:
Deferred income taxes, net of liabilities	5,211		4,478
Pensions and other postretirement benefits	712		710
Energy derivatives and other power contracts	839		947
Unamortized investments, net of accumulated amortization	105		80
San Onofre	730		857
Unamortized loss on reacquired debt	172		184
Regulatory balancing accounts	86		66
Environmental remediation	124		126
Other	49		7
Total long-term	8,028		7,455
Total regulatory assets	$	8,473	$	7,805

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Regulatory Liabilities

SCE's regulatory liabilities included on the consolidated balance sheets are:

(in millions)	September 30, 2017		December 31, 2016
Current:
Regulatory balancing accounts	$	1,188	$	736
San Onofre MHI arbitration award1	47		—
Other	46		20
Total current	1,281		756
Long-term:
Costs of removal	2,736		2,847
Recoveries in excess of ARO liabilities2	1,719		1,639
Regulatory balancing accounts	1,344		1,180
Other	59		60
Total long-term	5,858		5,726
Total regulatory liabilities	$	7,139	$	6,482

¹ Represents SCE's net recovery from claims against MHI. See Note 11 for further discussion.

² Represents the cumulative differences between ARO expenses and amounts collected in rates primarily for the decommissioning of SCE's nuclear generation facilities. Decommissioning costs recovered through rates are primarily placed in nuclear decommissioning trusts. This regulatory liability also represents the deferral of realized and unrealized gains and losses on the nuclear decommissioning trust investments. See Note 9 for further discussion.

Net Regulatory Balancing Accounts

The following table summarizes the significant components of regulatory balancing accounts included in the above tables of regulatory assets and liabilities:

(in millions)	September 30, 2017			December 31, 2016
Asset (liability)
Energy resource recovery account	$	190		$	(20	)
New system generation balancing account	(99		)	(6		)
Public purpose programs and energy efficiency programs	(1,178		)	(992		)
Tax accounting memorandum account and pole loading balancing account	(461		)	(142		)
Base rate recovery balancing account	(265		)	(426		)
Department of Energy litigation memorandum account	(156		)	(122		)
Greenhouse gas auction revenue	(63		)	31
FERC balancing accounts	(209		)	(69		)
Other	11			31
Liability	$	(2,230	)	$	(1,715	)

The tax accounting memorandum account (TAMA) provides that tax benefits or costs associated with certain events be tracked and adjusted annually in rates, including tax accounting method changes, changes in tax laws and regulations impacting depreciation or tax repair deductions, forecasted and actual differences in tax repair deductions, and the impact, if any, of a private letter ruling related to compliance with normalization regulations of the IRS. During the third quarter of 2017, SCE recorded $118 million of tax benefits related to tax accounting method changes resulting from the filing of SCE's 2016 tax returns in October 2017.

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Note 11.    Commitments and Contingencies

Third-Party Power Purchase Agreements

During the first nine months of 2017, SCE had existing PPAs that met the critical contract provisions (including completion of major milestones for construction). SCE's net additional commitments for power purchase agreements are estimated to be: $27 million in 2018, $72 million in 2019, $62 million in 2020, $20 million in 2021, and $1.2 billion for the remaining period thereafter. For further information, see Note 11 in the 2016 Form 10-K.

Indemnities

Edison International and SCE have various financial and performance guarantees and indemnity agreements, which are issued in the normal course of business.

Edison International and SCE have provided indemnifications through contracts entered into in the normal course of business. These are primarily indemnifications against adverse litigation outcomes in connection with underwriting agreements, and indemnities for specified environmental liabilities and income taxes with respect to assets sold. Edison International's and SCE's obligations under these agreements may or may not be limited in terms of time and/or amount, and in some instances Edison International and SCE may have recourse against third parties. Edison International and SCE have not recorded a liability related to these indemnities. The overall maximum amount of the obligations under these indemnifications cannot be reasonably estimated.

SCE has indemnified the City of Redlands, California in connection with the Mountainview power plant's California Energy Commission permit for cleanup or associated actions related to groundwater contaminated by perchlorate due to the disposal of filter cake at the City's solid waste landfill. The obligations under this agreement are not limited to a specific time period or subject to a maximum liability. SCE has not recorded a liability related to this indemnity.

Contingencies

In addition to the matters disclosed in these Notes, Edison International and SCE are involved in other legal, tax, and regulatory proceedings before various courts and governmental agencies regarding matters arising in the ordinary course of business. Edison International and SCE believe the outcome of these other proceedings will not, individually or in the aggregate, materially affect its financial position, results of operations and cash flows.

San Onofre Related Matters

Replacement steam generators were installed at San Onofre in 2010 and 2011. On January 31, 2012, a leak suddenly occurred in one of the heat transfer tubes in San Onofre's Unit 3 steam generators. The Unit was safely taken off-line and subsequent inspections revealed excessive tube wear. Unit 2 was off-line for a planned outage when areas of unexpected tube wear were also discovered. On June 6, 2013, SCE decided to permanently retire Units 2 and 3.

San Onofre CPUC Proceedings

In November 2014, the CPUC unanimously approved the Settlement Agreement by and among SCE, The Utility Reform Network, the CPUC's Office of Ratepayer Advocates and San Diego Gas & Electric ("SDG&E"), which was later joined by the Coalition of California Utility Employees and Friends of the Earth, dated November 20, 2014 (the "San Onofre OII Settlement Agreement"), which resolved the CPUC's investigation regarding the steam generator replacement project at San Onofre and the related outages and subsequent shutdown of San Onofre. Subsequently, the San Onofre Order Instituting Investigation ("OII") proceeding record was reopened by a joint ruling of the Assigned Commissioner and the Assigned administrative law judge ("ALJ") to consider whether, in light of SCE not reporting certain ex parte communications on a timely basis, the San Onofre OII Settlement Agreement remained reasonable, consistent with the law, and in the public interest, which is the standard the CPUC applies in reviewing settlements submitted for approval. In comments filed with the CPUC in July 2016, SCE asserted that the San Onofre OII Settlement Agreement continues to meet this standard and therefore should not be disturbed. 

In a December 2016 joint ruling, the Assigned Commissioner and the Assigned ALJ expressed concerns about the extent to which the failure to timely report ex parte communications had impacted the settlement negotiations and directed SCE and SDG&E to meet and confer with the other parties in the San Onofre OII to consider changing the terms of the San Onofre OII Settlement Agreement. In March 2017, SCE and the parties participating in the meet-and-confer process initiated a mediation of the issues identified in the December 2016 joint ruling. On August 15, 2017, SCE notified the CPUC that the parties in the San Onofre OII Settlement Agreement were unable to reach agreement on possible changes to the settlement unanimously approved by the CPUC in 2014. In connection with the termination of the meet-and-confer process, SCE asked the CPUC to

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affirm that the San Onofre OII Settlement Agreement is fair, reasonable and in the public interest. A number of the parties to the San Onofre OII, however, have requested that the CPUC either modify the San Onofre OII Settlement Agreement or vacate its previous approval of the settlement and reinstate the San Onofre OII for further proceedings. Several of the parties to the meet-and-confer process petitioned the CPUC on a broad range of litigation positions, certain of which included substantial additional disallowances.

On October 10, 2017, the Assigned Commissioner and ALJ issued a Ruling ordering additional process to resolve the San Onofre OII. The Ruling did not set aside nor confirm the San Onofre OII Settlement Agreement but stated that the CPUC required an additional record to address the appropriate cost allocation for the premature shutdown of San Onofre Units 2 and 3, in the event the CPUC decides that the settlement does not meet the CPUC's standards for approval of settlements. The Ruling sets an expedited schedule with a status conference on November 7, 2017 and hearings tentatively scheduled to end in March 2018. The CPUC has not announced the expected timing for a decision.

SCE has recorded a regulatory asset of $730 million at September 30, 2017 to reflect the expected recoveries under the San Onofre OII Settlement Agreement. Management assesses at the end of each reporting period whether regulatory assets are probable of future recovery. SCE assessed the San Onofre regulatory asset at September 30, 2017 and continues to conclude that the asset is probable, though not certain, of recovery based on SCE's knowledge of facts and judgment in applying the relevant regulatory principles to the issue. Such judgment is subject to uncertainty, and regulatory principles and precedents are not necessarily binding and are subject to interpretation.

Additional Challenges related to the Settlement of San Onofre CPUC Proceedings

A federal lawsuit challenging the CPUC's authority to permit rate recovery of San Onofre costs and an application to the CPUC for rehearing of its decision approving the San Onofre OII Settlement Agreement were filed in November and December 2014, respectively. In April 2015, the federal lawsuit was dismissed with prejudice and the plaintiffs in that case appealed the dismissal to the Ninth Circuit in May 2015. In light of the San Onofre OII meet-and-confer sessions, the Ninth Circuit cancelled the hearing that had been scheduled for February 9, 2017 and ordered the parties to notify the Ninth Circuit of the status of the San Onofre OII by May 1, 2017 and periodically thereafter. In October 2017, the Ninth Circuit scheduled a hearing for February 13, 2018 and directed the parties to file a status report on January 30, 2018.

In July 2015, a purported securities class action lawsuit was filed in federal court against Edison International, its then Chief Executive Officer and its then Chief Financial Officer. The complaint was later amended to include SCE's former President as a defendant. The lawsuit alleges that the defendants violated the securities laws by failing to disclose that Edison International had ex parte contacts with CPUC decision-makers regarding the San Onofre OII that were either unreported or more extensive than initially reported. The initial complaint purported to be filed on behalf of a class of persons who acquired Edison International common stock between March 21, 2014 and June 24, 2015 (the "Class Period"). In September 2016, the federal court granted defendants' motion to dismiss the complaint, with an opportunity for plaintiff to amend the complaint. Plaintiff filed an amended complaint, which the federal court dismissed again with an opportunity for the plaintiff to amend the complaint. Plaintiff filed a third amended complaint in May 2017, which extends the Class Period to August 10, 2015. Defendants filed a motion to dismiss the third amended complaint in June 2017, and are awaiting a ruling.

Also in July 2015, a federal shareholder derivative lawsuit was filed against members of the Edison International Board of Directors for breach of fiduciary duty and other claims. The federal derivative lawsuit is based on similar allegations to the federal class action securities lawsuit and seeks monetary damages, including punitive damages, and various corporate governance reforms. An additional federal shareholder derivative lawsuit making essentially the same allegations was filed in August 2015 and was subsequently consolidated with the July 2015 federal derivative lawsuit. In September 2016, the federal court granted defendants' motion to dismiss the consolidated complaint, with an opportunity for plaintiffs to amend the complaint. Plaintiffs did not file an amended complaint by the required date. Plaintiffs' deadline to appeal the federal court's order granting defendants' motion to dismiss lapsed in March 2017 and no appeal was filed.

In October 2015, a shareholder derivative lawsuit was filed in California state court against members of the Edison International Board of Directors for breach of fiduciary duty and other claims, making similar allegations to those in the federal derivative lawsuits discussed above. In light of the ruling in the parallel federal derivative lawsuit discussed above, plaintiff requested that the court voluntarily dismiss the state court action. The action was dismissed in April 2017.

In November 2015, a purported securities class action lawsuit was filed in federal court against Edison International, its then Chief Executive Officer and its Treasurer by an Edison International employee, alleging claims under the Employee Retirement Income Security Act. The complaint purports to be filed on behalf of a class of Edison International employees who were participants in the Edison 401(k) Savings Plan and invested in the Edison International Stock Fund between March 27, 2014 and June 24, 2015. The complaint alleges that defendants breached their fiduciary duties because they knew

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or should have known that investment in the Edison International Stock Fund was imprudent because the price of Edison International common stock was artificially inflated due to Edison International's alleged failure to disclose certain ex parte communications with CPUC decision-makers related to the San Onofre OII. In July 2016, the federal court granted the defendants' motion to dismiss the lawsuit with an opportunity for the plaintiff to amend her complaint. Plaintiff filed an amended complaint in July 2016, that dismissed Edison International as a named defendant and the remaining defendants filed a motion to dismiss in August 2016. These defendants' motion was heard by the court in November 2016. In June 2017, the federal court again granted defendants' motion to dismiss the lawsuit with an opportunity for the plaintiff to amend her complaint. Plaintiff filed an amended complaint in early July 2017. Defendants have filed motion to dismiss the amended complaint, which was heard by the court in October 2017, and are awaiting a ruling.

Edison International and SCE cannot predict the outcome of the open proceedings.

MHI Claims

SCE pursued claims against MHI, which designed and supplied the replacement steam generators. In October 2013, SCE sent MHI a formal request for binding arbitration under the auspices of the International Chamber of Commerce seeking damages for all losses. SCE alleged contract and tort claims and sought at least $4 billion in damages on behalf of itself and its customers and in its capacity as Operating Agent for San Onofre. MHI denied any liability and asserted counterclaims for $41 million, for which SCE denied any liability. Each of the other San Onofre owners (SDG&E and Riverside) sued MHI, alleging claims arising from MHI's supplying the faulty steam generators. These litigation claims have been stayed pending the arbitration. The other co-owners were added as additional claimants in the arbitration. In March 2017, the arbitration tribunal found MHI liable for breach of contract, but rejected claimants' other claims. The tribunal found that damages were subject to contractual limitations on liability. In addition, the tribunal ordered the claimants to pay MHI's legal costs but rejected MHI's counterclaims. The net recovery awarded to SCE was initially determined to be $52 million. An adjustment to the interest awarded to SCE subsequently reduced the net recovery to $47 million. As a result of uncertainty associated with the allocation of the award under the San Onofre OII Settlement Agreement, SCE recorded a regulatory liability for the net recovery.

Environmental Remediation

SCE records its environmental remediation liabilities when site assessments and/or remedial actions are probable and a range of reasonably likely cleanup costs can be estimated. SCE reviews its sites and measures the liability quarterly, by assessing a range of reasonably likely costs for each identified site using currently available information, including existing technology, presently enacted laws and regulations, experience gained at similar sites, and the probable level of involvement and financial condition of other potentially responsible parties. These estimates include costs for site investigations, remediation, operation and maintenance, monitoring, and site closure. Unless there is a single probable amount, SCE records the lower end of this reasonably likely range of costs (reflected in "Other long-term liabilities") at undiscounted amounts as timing of cash flows is uncertain.

At September 30, 2017, SCE's recorded estimated minimum liability to remediate its 19 identified material sites (sites with a liability balance at September 30, 2017, in which the upper end of the range of the costs is at least $1 million) was $125 million, including $74 million related to San Onofre. In addition to these sites, SCE also has 17 immaterial sites with a liability balance as of September 30, 2017, for which the total minimum recorded liability was $4 million. Of the $129 million total environmental remediation liability for SCE, $123 million has been recorded as a regulatory asset. SCE expects to recover $46 million through an incentive mechanism that allows SCE to recover 90% of its environmental remediation costs at certain sites (SCE may request to include additional sites) and $77 million through a mechanism that allows SCE to recover 100% of the costs incurred at certain sites through customer rates. SCE's identified sites include several sites for which there is a lack of currently available information, including the nature and magnitude of contamination, and the extent, if any, that SCE may be held responsible for contributing to any costs incurred for remediating these sites. Thus, no reasonable estimate of cleanup costs can be made for these sites.

The ultimate costs to clean up SCE's identified sites may vary from its recorded liability due to numerous uncertainties inherent in the estimation process, such as: the extent and nature of contamination; the scarcity of reliable data for identified sites; the varying costs of alternative cleanup methods; developments resulting from investigatory studies; the possibility of identifying additional sites; and the time periods over which site remediation is expected to occur. SCE believes that, due to these uncertainties, it is reasonably possible that cleanup costs at the identified material sites and immaterial sites could exceed its recorded liability by up to $151 million and $8 million, respectively. The upper limit of this range of costs was estimated using assumptions least favorable to SCE among a range of reasonably possible outcomes.

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SCE expects to clean up and mitigate its identified sites over a period of up to 30 years. Remediation costs for each of the next five years are expected to range from $5 million to $17 million. Costs incurred for the nine months ended September 30, 2017 and 2016 were $6 million and $3 million, respectively.

Based upon the CPUC's regulatory treatment of environmental remediation costs incurred at SCE, SCE believes that costs ultimately recorded will not materially affect its results of operations, financial position, or cash flows. There can be no assurance, however, that future developments, including additional information about existing sites or the identification of new sites, will not require material revisions to estimates.

Nuclear Insurance

SCE is a member of NEIL, a mutual insurance company owned by entities with nuclear facilities. NEIL provides insurance for nuclear property damage, including damages caused by acts of terrorism up to specified limits, and for accidental outages for active facilities. The amount of nuclear property damage insurance purchased for San Onofre and Palo Verde exceeds the minimum federal requirement of $1.06 billion. If NEIL losses at any nuclear facility covered by the arrangement were to exceed the accumulated funds for these insurance programs, SCE could be assessed retrospective premium adjustments of up to approximately $52 million per year.

Federal law limits public offsite liability claims for bodily injury and property damage from a nuclear incident to the amount of available financial protection, which is currently approximately $13.4 billion. Based on its ownership interests, SCE could be required to pay a maximum of approximately $255 million per nuclear incident. However, it would have to pay no more than approximately $38 million per incident in any one year.

For more information on nuclear insurance coverage, see Note 11 in the 2016 Form 10-K.

Wildfire Insurance

Severe wildfires in California have given rise to large damage claims against California utilities for fire-related losses alleged to be the result of utility practices and/orthe failure of electric and other utility equipment. Invoking a California Court of Appeal decision, plaintiffs pursuing these claims have relied on the doctrine of inverse condemnation, which can impose strict liability (including liability for a claimant's attorneys' fees) for property damage. Drought and other severe weather conditions in California have also increased the duration of the wildfire season and the risk of severe wildfire events. SCE has approximately $1 billion of insurance coverage for wildfire liabilities for the period ending on May 31, 2018. SCE has a self-insured retention of $10 million per wildfire occurrence. Various coverage limitations within the policies that make up this insurance coverage could result in additional self-insured costs in the event of multiple wildfire occurrences during the policy period. SCE or its vegetation management contractors may experience coverage reductions and/or increased insurance costs in future years. No assurance can be given that future losses will not exceed the limits of insurance coverage. In the event of fire-related losses involving utility practices and/or the failure of electric and other utility equipment, SCE may be unable to recover self-insured retention or losses in excess of insurance coverage from customers.

Spent Nuclear Fuel

Under federal law, the U.S. Department of Energy ("DOE") is responsible for the selection and construction of a facility for the permanent disposal of spent nuclear fuel and high-level radioactive waste. The DOE has not met its contractual obligation to accept spent nuclear fuel. Extended delays by the DOE have led to the construction of costly alternatives and associated siting and environmental issues. Currently, both San Onofre and Palo Verde have interim storage for spent nuclear fuel on site sufficient for their current license period.

In June 2010, the United States Court of Federal Claims issued a decision granting SCE and the San Onofre co-owners damages of approximately $142 million (SCE share $112 million) to recover costs incurred through December 31, 2005 for the DOE's failure to meet its obligation to begin accepting spent nuclear fuel from San Onofre. SCE received payment from the federal government in the amount of the damage award. In April 2016, SCE, as operating agent, settled a lawsuit on behalf of the San Onofre owners against the DOE for $162 million, including reimbursement for legal costs (SCE share $124 million) to compensate for damages caused by the DOE's failure to meet its obligation to begin accepting spent nuclear fuel for the period from January 1, 2006 to December 31, 2013. The settlement also provides for a claim submission/audit process for expenses incurred from 2014 – 2016, where SCE will submit a claim for damages caused by the DOE failure to accept spent nuclear fuel each year, followed by a government audit and payment of the claim. This process will make additional legal action to recover damages incurred in 2014 – 2016 unnecessary. The first such claim covering damages for 2014 – 2015 was filed on September 30, 2016 for approximately $56 million. In February 2017, the DOE reviewed the 2014 – 2015 claim submission and reduced the original request to approximately $43 million (SCE share was approximately $34 million) primarily due to DOE allocation limits. SCE accepted the DOE's determination, and the government paid the

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2014 – 2015 claim under the terms of the settlement. In October 2017, SCE filed a claim covering damages for 2016 for approximately $59 million. All damages recovered by SCE are subject to CPUC review as to how these amounts would be distributed among customers, shareholders, or to offset fuel decommissioning or storage costs.

In August 2017, SCE settled a dispute brought by Citizens Oversight and an individual that sought to overturn the California Coastal Commission's approval of a coastal development permit granted in October 2015 for the expansion of San Onofre ISFSI (a dry cask storage facility for the long-term, on-site storage of nuclear fuel). The plaintiffs primarily alleged that the California Coastal Commission did not adequately consider alternative, offsite locations for the ISFSI. The parties' settlement permits the current ISFSI project to proceed while steps are taken to identify the potential for moving the fuel offsite in the future. In the settlement, SCE agreed to use "commercially reasonable efforts" to relocate San Onofre fuel to an offsite storage facility, agreeing to spend up to $4 million, which will be funded by the nuclear decommissioning trust, principally for retaining experts and preparing spent nuclear fuel transportation and strategic plans applicable to a potential relocation of the fuel.

SCE Collective Bargaining Agreement

Approximately 3,900 of SCE's full-time employees are covered by collective bargaining agreements with the International Brotherhood of Electrical Workers ("IBEW"). SCE and IBEW recently negotiated, and among other things, IBEW ratified, 3% per year wage increases covering calendar years 2018 and 2019. The wage increases are effective as of October 2, 2017. The IBEW collective bargaining agreements expire on December 31, 2019.

Note 12.    Preferred and Preference Stock of SCE

During the second quarter of 2017, SCE issued $475 million of 5.00% Series L preference stock (190,004 shares; cumulative, $2,500 liquidation value) to SCE Trust VI, a special purpose entity formed to issue trust securities as discussed in Note 3. The Series L preference stock may be redeemed at a premium, in whole, but not in part, at any time prior to June 26, 2022 if certain changes in tax or investment company law or interpretation or applicable rating agency equity credit criteria occur and certain other conditions are satisfied. On or after June 26, 2022, SCE may redeem the Series L shares at par, in whole or in part. The shares are not subject to mandatory redemption. In July 2017, the proceeds were used to redeem $475 million of SCE's Series F Preference Stock.

Note 13.    Accumulated Other Comprehensive Loss

Edison International's accumulated other comprehensive loss, net of tax consist of:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Beginning balance	$	(48	)	$	(53	)	$	(53	)	$	(56	)
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	2			2			5			5
Other	(2		)	—			—			—
Change	—			2			5			5
Ending Balance	$	(48	)	$	(51	)	$	(48	)	$	(51	)

¹  These items are included in the computation of net periodic pension and PBOP Plan expense. See Note 8 for additional information.

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SCE's accumulated other comprehensive loss, net of tax consist of:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Beginning balance	$	(18	)	$	(20	)	$	(20	)	$	(22	)
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	—			1			2			3
Change	—			1			2			3
Ending Balance	$	(18	)	$	(19	)	$	(18	)	$	(19	)

¹  These items are included in the computation of net periodic pension and PBOP Plan expense. See Note 8 for additional information.

Note 14.    Interest and Other Income and Other Expenses

Interest and other income and other expenses are as follows:

	Three months ended September 30,				Nine months ended September 30,
(in millions)	2017		2016		2017		2016
SCE interest and other income:
Equity allowance for funds used during construction	$	24	$	16	$	65	$	58
Increase in cash surrender value of life insurance policies and life insurance benefits	12		12		34		29
Interest income	3		1		5		4
Other	3		3		7		6
Total SCE interest and other income	42		32		111		97
Other income of Edison International Parent and Other	—		—		—		—
Total Edison International interest and other income	$	42	$	32	$	111	$	97
SCE other expenses:
Civic, political and related activities and donations	$	6	$	6	$	17	$	19
Other	3		3		11		7
Total SCE other expenses	9		9		28		26
Other expenses of Edison International Parent and Other	—		—		—		3
Total Edison International other expenses	$	9	$	9	$	28	$	29

Note 15.    Supplemental Cash Flows Information

Supplemental cash flows information for continuing operations is:

	Edison International				SCE
	Nine months ended September 30,
(in millions)	2017		2016		2017		2016
Cash payments for interest and taxes:
Interest, net of amounts capitalized	$	453	$	417	$	421	$	408
Tax payments, net of refunds	13		12		20		35
Non-cash financing and investing activities:
Dividends declared but not paid:
Common stock	$	177	$	156	$	191	$	—
Preferred and preference stock	1		1		1		1

SCE's accrued capital expenditures at September 30, 2017 and 2016 were $319 million and $268 million, respectively. Accrued capital expenditures will be included as an investing activity in the consolidated statements of cash flow in the period paid.

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CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

The management of Edison International and SCE, under the supervision and with the participation of Edison International's and SCE's respective Chief Executive Officers and Chief Financial Officers, have evaluated the effectiveness of Edison International's and SCE's disclosure controls and procedures (as that term is defined in Rules 13a-15(e) or 15d-15(e) under the Securities Exchange Act of 1934, as amended), respectively, as of the end of the third quarter of 2017. Based on that evaluation, Edison International's and SCE's respective Chief Executive Officers and Chief Financial Officers have each concluded that, as of the end of the period, Edison International's and SCE's disclosure controls and procedures, respectively, were effective.

Changes in Internal Control Over Financial Reporting

There were no changes in Edison International's or SCE's internal control over financial reporting, respectively, during the third quarter of 2017 that have materially affected, or are reasonably likely to materially affect, Edison International's or SCE's internal control over financial reporting.

Jointly Owned Utility Plant

Edison International's and SCE's respective scope of evaluation of internal control over financial reporting includes their Jointly Owned Utility Projects as discussed in Note 2. Property, Plant and Equipment in the 2016 Form 10-K.

LEGAL PROCEEDINGS

None.

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UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Purchases of Equity Securities by Edison International and Affiliated Purchasers

The following table contains information about all purchases of Edison International Common Stock made by or on behalf of Edison International in the third quarter of 2017.

Period	(a) Total Number of Shares (or Units) Purchased1	(b) Average Price Paid per Share (or Unit)1			(c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs	(d) Maximum Number (or Approximate Dollar Value) of Shares (or Units) that May Yet Be Purchased Under the Plans or Programs
July 1, 2017 to July 31, 2017	109,698		$	78.41	—	—
August 1, 2017 to August 31, 2017	367,285		$	80.16	—	—
September 1, 2017 to September 30, 2017	209,997		$	79.12	—	—
Total	686,980		$	79.56	—	—

¹  The shares were purchased by agents acting on Edison International's behalf for delivery to plan participants to fulfill requirements in connection with Edison International's: (i) 401(k) Savings Plan; (ii) Dividend Reinvestment and Direct Stock Purchase Plan; and (iii) long-term incentive compensation plans. The shares were purchased in open-market transactions pursuant to plan terms or participant elections. The shares were never registered in Edison International's name and none of the shares purchased were retired as a result of the transactions.

Purchases of Equity Securities by SCE and Affiliated Purchasers

The following table contains information about all purchases of SCE Series F Preference Stock made by or on behalf of SCE in the third quarter of 2017.

Period	(a) Total Number of Shares (or Units) Purchased1	(b) Average Price Paid per Share (or Unit)1			(c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs	(d) Maximum Number (or Approximate Dollar Value) of Shares (or Units) that May Yet Be Purchased Under the Plans or Programs
July 1, 2017 to July 31, 2017	190,004		$	2,513.00	190,004	—
August 1, 2017 to August 31, 2017	—		—		—	—
September 1, 2017 to September 30, 2017	—		$	—	—	—
Total	190,004		$	2,513.00	190,004	—

¹  On July 19, 2017, SCE repurchased 190,004 shares of the Series F Preference Shares, at $2,513(liquidation value and accrued dividends) per share. The redemption of SCE's Series F Preference Stock was announced via an SCE press release on June 19, 2017.

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EXHIBITS

Exhibit Number	Description
10.1**	Edison International and Southern California Edison Company Director Compensation Schedule, as adopted August 24, 2017
31.1	Certifications of the Chief Executive Officer and Chief Financial Officer of Edison International pursuant to Section 302 of the Sarbanes-Oxley Act
31.2	Certifications of the Chief Executive Officer and Chief Financial Officer of Southern California Edison Company pursuant to Section 302 of the Sarbanes-Oxley Act
32.1	Certifications of the Chief Executive Officer and the Chief Financial Officer of Edison International required by Section 906 of the Sarbanes-Oxley Act
32.2	Certifications of the Chief Executive Officer and the Chief Financial Officer of Southern California Edison Company required by Section 906 of the Sarbanes-Oxley Act
101.1	Financial statements from the quarterly report on Form 10-Q of Edison International for the quarter ended September 30, 2017, filed on October 30, 2017, formatted in XBRL: (i) the Consolidated Statements of Income; (ii) the Consolidated Statements of Comprehensive Income; (iii) the Consolidated Balance Sheets; (iv) the Consolidated Statements of Cash Flows; and (v) the Notes to Consolidated Financial Statements
101.2	Financial statements from the quarterly report on Form 10-Q of Southern California Edison Company for the quarter ended September 30, 2017, filed on October 30, 2017, formatted in XBRL: (i) the Consolidated Statements of Income; (ii) the Consolidated Statements of Comprehensive Income; (iii) the Consolidated Balance Sheets; (iv) the Consolidated Statements of Cash Flows; and (v) the Notes to Consolidated Financial Statements

________________________________________

** Indicates a management contract or compensatory plan or arrangement, as required by Item 15(a)(3) of Form 10-K

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned, thereunto duly authorized.

	EDISON INTERNATIONAL		SOUTHERN CALIFORNIA EDISON COMPANY
By:	/s/ Aaron D. Moss	By:	/s/ Aaron D. Moss
	Aaron D. Moss Vice President and Controller (Duly Authorized Officer and Principal Accounting Officer)		Aaron D. Moss Vice President and Controller (Duly Authorized Officer and Principal Accounting Officer)
Date:	October 30, 2017	Date:	October 30, 2017

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EX-10.1

Exhibit 10.1

EDISON INTERNATIONAL AND SOUTHERN CALIFORNIA EDISON COMPANY

DIRECTOR COMPENSATION SCHEDULE

As Adopted August 24, 2017

Effective October 1, 2017, except as otherwise provided below, non-employee Directors of Edison International (“EIX”) and/or Southern California Edison Company (“SCE”) will receive the annual retainers, meeting fees, meeting expenses and equity‑based awards described below as compensation for serving as a Director. The equity-based award provisions described below are effective for Directors elected or reelected on or after August 24, 2017.

Directors who are employees of EIX or SCE shall not receive additional compensation for serving as Directors (other than participation in the EIX Director Matching Gifts Program). Directors who serve on both the EIX Board and the SCE Board, and their corresponding Board Committees, will not receive additional compensation, including additional meeting fees for SCE business meetings held concurrently or consecutively with a corresponding EIX business meeting.

Annual Retainers

Board Retainer – Each Director will receive an annual board retainer of $115,000 to be paid in advance in quarterly installments of $28,750 for any calendar quarter or portion thereof during which the individual serves as a Director.

Board Committee Chair Retainer – Each Director who serves as the Chair of a Board Committee will receive an additional annual retainer of$15,000, except the Director who serves as the Chair of the Audit Committee will receive an additional annual retainer of $20,000 and the Director who serves as the Chair of the Compensation and Executive Personnel Committee will receive an additional annual retainer of $17,500. The Committee Chair retainers shall be paid in advance in equal quarterly installments for any calendar quarter or portion thereof during which the Director serves as a Committee Chair.

Chair of EIX Board Retainer – A non-employee Director who serves as the Chair of the EIX Board shall receive an additional annual retainer of $62,500. The retainer shall be paid in advance in equal quarterly installments for any calendar quarter or portion thereof during which the Director serves as the Chair of the EIX Board.

The quarterly retainer installments will be paid on the first business day of the calendar quarter. Initial quarterly retainer installments will be paid as soon as possible following the effective date of the election.

1

Meeting Fees

No meeting fee shall be paid for attending a meeting of the Board, any Board Committee, or shareholders. Each Director will receive $2,000 for each business meeting attended on behalf of the corporation in his or her capacity as a Director, at the request or invitation of either the Chair of the EIX Board or the EIX Chief Executive Officer. Each Director shall receive only one meeting fee for any concurrent meetings attended by the Director. Full meeting fees will be paid if the Director attends any portion of any meeting.

Meeting fees will be paid on the first business day of either the first or second month following the month in which the meeting occurred.

Expense Reimbursement

A Director will promptly be reimbursed after submitting to the Corporate Secretary a statement of expenses, supported by receipts and any other requested documentation, for (i) reasonable expenses incurred by the Director to attend Board meetings, Committee meetings, or business meetings attended on behalf of the corporation in his or her capacity as a Director, and (ii) reasonable program fees and expenses incurred by the Director to attend director education programs that are relevant to service on the Board.

Equity-Based Awards

Equity-based awards (“Awards”) will be granted under and subject to the terms of the EIX 2007 Performance Incentive Plan or a successor plan (the “Plan”), except that any award payable in cash will be deemed paid outside of the Plan. The Awards consist of fully vested Edison International deferred stock units (“DSUs”) and/or Edison International common stock (“Common Stock”). DSUs represent the value of one share of Common Stock and will be credited to the Director’s account under the EIX Director Deferred Compensation Plan and subject to the terms of that plan. DSUs include dividend equivalent rights that are converted to additional DSUs. The number of DSUs or shares of Common Stock awarded to a Director in any particular instance will be calculated by dividing the applicable equity award amount to be granted on that date (expressed in dollars and determined as set forth below, the “Award Amount”) by the fair market value of a share of Common Stock as of that date, rounded up to the nearest whole share. Fair market value for these purposes shall be determined in accordance with the Plan. Each Award will be subject to terms and conditions approved in advance by the Board.

Initial Election Award – Upon the initial election of a Director to the Board, the Director will receive an award of DSUs with an aggregate Award Amount of $140,000 subject to proration as provided below, the date of grant of which shall be the effective date of such election.

2

Annual Reelection Award – Each Director reelected to the Board will receive Common Stock and/or DSUs with an aggregate Award Amount of$140,000, the date of grant of which shall be the date of such reelection. The portion of the award to be granted in Common Stock and/or DSUs shall be specified in advance by the Director as provided in the next paragraph.

Prior to the year the Annual Reelection Award is granted, the Director may elect to receive the award entirely in shares of Common Stock, entirely in DSUs, or in any combination of each, except that if a fractional share would result, the Common Stock portion will be rounded up to the next whole share and the DSU portion will be rounded down to the next whole DSU. If no such election is timely made by the Director for a particular year, the Director’s Annual Reelection Award (if any) for that year will be entirely Common Stock.

Additional Award to Chair of EIX Board – Upon the initial appointment of a non-employee Director as Chair of the EIX Board, the Director will receive Common Stock and/or DSUs with an aggregate Award Amount of $62,500 subject to proration as provided below, the date of grant of which shall be the effective date of such appointment.

If a non-employee Director serving as Chair of the EIX Board is reelected to the EIX Board and is reappointed or otherwise remains Chair of the EIX Board following such reelection, then that Director will receive an Additional Award of Common Stock and/or DSUs with an Award Amount of $62,500 (in addition to the Annual Reelection Award Amount of$140,000, for a total Award Amount of$202,500), the grant date of which shall be the date of such reelection.

The portion of the Additional Award to be granted in Common Stock and/or DSUs shall be subject to the Director’s election in effect (if any) for that year’s Annual Reelection Award. To the extent no such election is in effect, the Additional Award for an initial appointment as Chair shall be made in the form of DSUs and any subsequent Additional Award for that Chair shall be made in the form of Common Stock.

Proration of Certain Awards. The Initial Election and Additional Award amounts provided for above are subject to proration if the grant date of the Award occurs (i) in the second quarter of EIX’s fiscal year and after the date of EIX’s annual meeting of shareholders for that year, (ii) in the third quarter of EIX’s fiscal year, or (iii) in the fourth quarter of EIX’s fiscal year. In determining the Award Amount as to any such Award, the applicable dollar amount set forth above will be multiplied by a percentage determined in accordance with the table set forth below.

3

If the grant date of the award occurs:	Then the applicable percentage is:
In the first quarter of EIX’s fiscal year, or in the second quarter of EIX’s fiscal year and on or before the date of EIX’s annual meeting of shareholders for that year	100% (no proration)
In the second quarter of EIX’s fiscal year and after the date of EIX’s annual meeting of shareholders for that year	75%
In the third quarter of EIX’s fiscal year	50%
In the fourth quarter of EIX’s fiscal year	25%

However, if a non-employee Director receives an Initial Election and/or Additional Award during a particular EIX fiscal year before the date of EIX’s annual meeting of shareholders for that year, the Director will not receive that same Award Amount again if he or she is reelected as a Director in that fiscal year.

EIX Affiliate Boards – SCE non-employee Directors who do not serve on the EIX Board will receive Awards equal in amount to EIX non-employee Directors if the SCE Board authorizes such compensation. Differing amounts of SCE Awards, and Awards for non‑employee directors of other EIX affiliates, may only be made with additional approval of the EIX Board.

Matching Gift Program

Directors of EIX and SCE are eligible to participate in the EIX Director Matching Gifts Program.

4

EX-31.1

Exhibit 31.1

CERTIFICATION

I, PEDRO J. PIZARRO, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, of Edison International;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: October 30, 2017

/s/ PEDRO J. PIZARRO

PEDRO J. PIZARRO

Chief Executive Officer

Exhibit 31.1

CERTIFICATION

I, MARIA RIGATTI, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, of Edison International;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f)) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: October 30, 2017

/s/ MARIA RIGATTI

MARIA RIGATTI

Chief Financial Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, KEVIN M. PAYNE, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, of Southern California Edison Company;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f)) for the registrant and have:

        (a)   Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

        (b)   Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

        (c)   Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

        (d)   Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

        (a)   All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

        (b)   Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: October 30, 2017

/s/ KEVIN M. PAYNE

KEVIN M. PAYNE

Chief Executive Officer

Exhibit 31.2

CERTIFICATION

I, WILLIAM M. PETMECKY III, certify that:

1.    I have reviewed this Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, of Southern California Edison Company;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f)) for the registrant and have:

        (a)   Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

        (b)   Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

        (c)   Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

        (d)   Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

        (a)   All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

        (b)   Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: October 30, 2017

/s/ WILLIAM M. PETMECKY III

WILLIAM M. PETMECKY III

Chief Financial Officer

EX-32.1

Exhibit 32.1

STATEMENT PURSUANT TO 18 U.S.C. SECTION 1350, AS

ENACTED BY SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the accompanying Quarterly Report on Form 10-Q for the quarter ended September 30, 2017 (the "Quarterly Report"), of Edison International (the "Company"), and pursuant to 18 U.S.C. Section 1350, as enacted by Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned certifies, to the best of his or her knowledge, that:

1. The Quarterly Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d)); and

2. The information contained in the Quarterly Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: October 30, 2017

/s/ PEDRO J. PIZARRO

PEDRO J. PIZARRO

Chief Executive Officer

Edison International

/s/ MARIA RIGATTI

MARIA RIGATTI

Chief Financial Officer

Edison International

This statement accompanies the Quarterly Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

A signed original of this written statement has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

STATEMENT PURSUANT TO 18 U.S.C. SECTION 1350, AS

ENACTED BY SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the accompanying Quarterly Report on Form 10-Q for the quarter ended September 30, 2017 (the "Quarterly Report"), of Southern California Edison Company (the "Company"), and pursuant to 18 U.S.C. Section 1350, as enacted by Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned certifies, to the best of his knowledge, that:

1. The Quarterly Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d)); and

2. The information contained in the Quarterly Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: October 30, 2017

/s/ KEVIN M. PAYNE

KEVIN M. PAYNE

Chief Executive Officer

Southern California Edison Company

/s/ WILLIAM M. PETMECKY III

WILLIAM M. PETMECKY III

Chief Financial Officer

Southern California Edison Company

This statement accompanies the Quarterly Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

A signed original of this written statement has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 27, 2017
Entity Information [Line Items]
Entity Registrant Name	EDISON INTERNATIONAL
Entity Central Index Key	0000827052
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		325,811,206
Southern California Edison
Entity Information [Line Items]
Entity Registrant Name	SOUTHERN CALIFORNIA EDISON CO
Entity Central Index Key	0000092103
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		434,888,104

XML

Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating revenue	$ 3,672	$ 3,767	$ 9,100	$ 8,985
Purchased power and fuel	1,783	1,719	3,742	3,576
Operation and maintenance	713	740	2,016	2,090
Depreciation and amortization	524	521	1,535	1,504
Property and other taxes	98	92	284	269
Impairment charges	0	0	22	0
Other operating (income) and expenses	(7)	0	(8)	21
Total operating expenses	3,111	3,072	7,591	7,460
Operating income	561	695	1,509	1,525
Interest and other income	42	32	111	97
Interest expense	(162)	(147)	(473)	(431)
Other expenses	(9)	(9)	(28)	(29)
Income from continuing operations before income taxes	432	571	1,119	1,162
Income tax (benefit) expense	(69)	120	(83)	96
Income from continuing operations	501	451	1,202	1,066
Income from discontinued operations, net of tax	0	0	0	(1)
Net income	501	451	1,202	1,065
Preferred and preference stock dividend requirements of SCE	32	31	94	92
Other noncontrolling interests	(1)	(1)	(2)	(9)
Net income attributable to Edison International common shareholders	470	421	1,110	982
Amounts attributable to Edison International common shareholders:
Income from continuing operations, net of tax	470	421	1,110	983
Income from discontinued operations, net of tax	0	0	0	(1)
Net income attributable to Edison International common shareholders	$ 470	$ 421	$ 1,110	$ 982
Basic earnings per common share attributable to Edison International common shareholders:
Weighted average common shares outstanding (in shares)	326	326	326	326
Continuing operations (in dollars per share)	$ 1.44	$ 1.29	$ 3.41	$ 3.01
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Total (in dollars per share)	$ 1.44	$ 1.29	$ 3.41	$ 3.01
Diluted earnings per common share attributable to Edison International common shareholders:
Weighted-average shares of common stock outstanding, including effect of dilutive securities (in shares)	328	330	329	330
Continuing operations (in dollars per share)	$ 1.43	$ 1.27	$ 3.38	$ 2.98
Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.00
Total (in dollars per share)	1.43	1.27	3.38	2.98
Dividends declared per common share (in dollars per share)	$ 0.5425	$ 0.4800	$ 1.6275	$ 1.4400
Southern California Edison Company
Operating revenue	$ 3,652	$ 3,752	$ 9,061	$ 8,956
Purchased power and fuel	1,783	1,719	3,742	3,576
Operation and maintenance	681	702	1,918	1,993
Depreciation and amortization	521	519	1,528	1,497
Property and other taxes	97	91	279	268
Other operating (income) and expenses	(8)	0	(8)	0
Total operating expenses	3,074	3,031	7,459	7,334
Operating income	578	721	1,602	1,622
Interest and other income	42	32	111	97
Interest expense	(149)	(137)	(436)	(402)
Other expenses	(9)	(9)	(28)	(26)
Income from continuing operations before income taxes	462	607	1,249	1,291
Income tax (benefit) expense	(35)	141	34	151
Net income	497	466	1,215	1,140
Preferred and preference stock dividend requirements of SCE	32	31	94	92
Net income attributable to Edison International common shareholders	465	435	1,121	1,048
Amounts attributable to Edison International common shareholders:
Net income attributable to Edison International common shareholders	$ 465	$ 435	$ 1,121	$ 1,048

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income	$ 501	$ 451	$ 1,202	$ 1,065
Pension and postretirement benefits other than pensions:
Amortization of net loss included in net income	2	2	5	5
Other	(2)	0	0	0
Other comprehensive income, net of tax	0	2	5	5
Comprehensive income	501	453	1,207	1,070
Less: Comprehensive income attributable to noncontrolling interests	31	30	92	83
Comprehensive income attributable to Edison International	470	423	1,115	987
Southern California Edison Company
Net income	497	466	1,215	1,140
Pension and postretirement benefits other than pensions:
Amortization of net loss included in net income	0	1	2	3
Other comprehensive income, net of tax	0	1	2	3
Comprehensive income	$ 497	$ 467	$ 1,217	$ 1,143

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 117	$ 96
Receivables, less allowance	1,105	714
Accrued unbilled revenue	352	370
Inventory	229	239
Prepaid taxes	179	1
Derivative assets	36	73
Regulatory assets	445	350
Other current assets	295	280
Total current assets	2,758	2,123
Nuclear decommissioning trusts	4,415	4,242
Other investments	72	83
Total investments	4,487	4,325
Utility property, plant and equipment, less accumulated depreciation and amortization of $9,173 and $9,000 at respective dates	37,666	36,806
Nonutility property, plant and equipment, less accumulated depreciation	295	194
Total property, plant and equipment	37,961	37,000
Regulatory assets	8,028	7,455
Other long-term assets	358	416
Total long-term assets	8,386	7,871
Total assets	53,592	51,319
LIABILITIES AND EQUITY
Short-term debt	908	1,307
Current portion of long-term debt	583	981
Accounts payable	1,104	1,342
Accrued taxes	90	50
Customer deposits	276	269
Derivative liabilities	3	216
Regulatory liabilities	1,281	756
Other current liabilities	1,164	991
Total current liabilities	5,409	5,912
Long-term debt	11,638	10,175
Deferred income taxes and credits	9,141	8,327
Derivative liabilities	0	941
Pensions and benefits	1,378	1,354
Asset retirement obligations	2,682	2,590
Regulatory liabilities	5,858	5,726
Other deferred credits and other long-term liabilities	2,863	2,102
Total deferred credits and other liabilities	21,922	21,040
Total liabilities	38,969	37,127
Commitments and contingencies (Note 11)
Redeemable noncontrolling interest	13	5
Common stock, no par value	2,520	2,505
Accumulated other comprehensive loss	(48)	(53)
Retained earnings	9,944	9,544
Total common shareholder's equity	12,416	11,996
Noncontrolling interests – preferred and preference stock of SCE	2,194	2,191
Total equity	14,610	14,187
Total liabilities and equity	53,592	51,319
Southern California Edison Company
ASSETS
Cash and cash equivalents	61	39
Receivables, less allowance	1,087	699
Accrued unbilled revenue	351	369
Inventory	229	239
Prepaid taxes	209	16
Derivative assets	36	73
Regulatory assets	445	350
Other current assets	270	246
Total current assets	2,688	2,031
Nuclear decommissioning trusts	4,415	4,242
Other investments	49	50
Total investments	4,464	4,292
Utility property, plant and equipment, less accumulated depreciation and amortization of $9,173 and $9,000 at respective dates	37,666	36,806
Nonutility property, plant and equipment, less accumulated depreciation	73	75
Total property, plant and equipment	37,739	36,881
Regulatory assets	8,028	7,455
Other long-term assets	229	232
Total long-term assets	8,257	7,687
Total assets	53,148	50,891
LIABILITIES AND EQUITY
Short-term debt	329	769
Current portion of long-term debt	579	579
Accounts payable	1,100	1,344
Accrued taxes	92	45
Customer deposits	276	269
Derivative liabilities	3	216
Regulatory liabilities	1,281	756
Other current liabilities	1,098	729
Total current liabilities	4,758	4,707
Long-term debt	10,426	9,754
Deferred income taxes and credits	10,966	9,886
Derivative liabilities	0	941
Pensions and benefits	944	896
Asset retirement obligations	2,675	2,586
Regulatory liabilities	5,858	5,726
Other deferred credits and other long-term liabilities	2,528	1,912
Total deferred credits and other liabilities	22,971	21,947
Total liabilities	38,155	36,408
Commitments and contingencies (Note 11)
Common stock, no par value	2,168	2,168
Additional paid-in capital	668	657
Accumulated other comprehensive loss	(18)	(20)
Retained earnings	9,930	9,433
Total common shareholder's equity	12,748	12,238
Noncontrolling interests – preferred and preference stock of SCE	2,245	2,245
Total equity	14,993	14,483
Total liabilities and equity	$ 53,148	$ 50,891

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Receivables, allowances for uncollectible accounts	$ 55	$ 62
Utility property, plant and equipment, accumulated depreciation	9,173	9,000
Nonutility property, plant and equipment, accumulated depreciation	$ 109	$ 99
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	800,000,000	800,000,000
Common stock, shares issued	325,811,206	325,811,206
Common stock, shares outstanding	325,811,206	325,811,206
Southern California Edison Company
Receivables, allowances for uncollectible accounts	$ 55	$ 61
Utility property, plant and equipment, accumulated depreciation	9,173	9,000
Nonutility property, plant and equipment, accumulated depreciation	$ 94	$ 89
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	560,000,000	560,000,000
Common stock, shares issued	434,888,104	434,888,104
Common stock, shares outstanding	434,888,104	434,888,104

XML

Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 1,202	$ 1,065
Less: loss from discontinued operations	0	(1)
Income from continuing operations	1,202	1,066
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	1,591	1,575
Allowance for equity during construction	(65)	(58)
Impairment charges	22	0
Deferred income taxes and investment tax credits	77	114
Other	8	17
Nuclear decommissioning trusts	(117)	(159)
EME settlement payments, net of insurance proceeds	0	(209)
Changes in operating assets and liabilities:
Receivables	(387)	(235)
Inventory	10	(43)
Accounts payable	(11)	151
Prepaid and accrued taxes	(128)	56
Other current assets and liabilities	(17)	(68)
Derivative assets and liabilities	(24)	15
Regulatory assets and liabilities	560	189
Other noncurrent assets and liabilities	(31)	91
Net cash provided by operating activities	2,690	2,502
Cash flows from financing activities:
Long-term debt issued or remarketed, net of discount and issuance costs	2,236	397
Long-term debt matured or repurchased	(1,182)	(83)
Preference stock issued, net	463	294
Preference stock redeemed	(475)	(125)
Short-term debt financing, net	(401)	60
Payments for stock-based compensation	(365)	(175)
Receipt from stock option exercises	201	102
Dividends to noncontrolling interests	(100)	(98)
Dividends paid	(530)	(469)
Other	(23)	(5)
Net cash used in financing activities	(176)	(102)
Cash flows from investing activities:
Capital expenditures	(2,660)	(2,773)
Proceeds from sale of nuclear decommissioning trust investments	3,974	2,075
Purchases of nuclear decommissioning trust investments	(3,857)	(1,916)
Life insurance policy loan proceeds	26	140
Other	24	(3)
Net cash used in investing activities	(2,493)	(2,477)
Net increase (decrease) in cash and cash equivalents	21	(77)
Cash and cash equivalents at beginning of period	96	161
Cash and cash equivalents at end of period	117	84
Southern California Edison Company
Cash flows from operating activities:
Net income	1,215	1,140
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	1,581	1,564
Allowance for equity during construction	(65)	(58)
Deferred income taxes and investment tax credits	337	84
Other	0	7
Nuclear decommissioning trusts	(117)	(159)
Changes in operating assets and liabilities:
Receivables	(389)	(256)
Inventory	11	5
Accounts payable	(16)	152
Prepaid and accrued taxes	(146)	111
Other current assets and liabilities	(13)	(44)
Derivative assets and liabilities	(24)	15
Regulatory assets and liabilities	560	189
Other noncurrent assets and liabilities	(141)	88
Net cash provided by operating activities	2,793	2,838
Cash flows from financing activities:
Long-term debt issued or remarketed, net of discount and issuance costs	1,445	0
Long-term debt matured or repurchased	(781)	(81)
Preference stock issued, net	463	294
Preference stock redeemed	(475)	(125)
Short-term debt financing, net	(441)	189
Payments for stock-based compensation	(80)	(121)
Receipt from stock option exercises	45	73
Dividends paid	(481)	(607)
Other	(34)	(4)
Net cash used in financing activities	(339)	(382)
Cash flows from investing activities:
Capital expenditures	(2,596)	(2,747)
Proceeds from sale of nuclear decommissioning trust investments	3,974	2,075
Purchases of nuclear decommissioning trust investments	(3,857)	(1,916)
Life insurance policy loan proceeds	26	140
Other	21	5
Net cash used in investing activities	(2,432)	(2,443)
Net increase (decrease) in cash and cash equivalents	22	13
Cash and cash equivalents at beginning of period	39	26
Cash and cash equivalents at end of period	$ 61	$ 39

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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Discounts and issuance costs of long term debt	$ 1	$ (3)
Southern California Edison Company
Discounts and issuance costs of long term debt	$ 10

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Organization and Basis of Presentation

Edison International is the parent holding company of Southern California Edison Company ("SCE"). SCE is an investor-owned public utility primarily engaged in the business of supplying and delivering electricity to an approximately 50,000 square mile area of southern California. Edison International is also the parent company of Edison Energy Group, Inc., a holding company for subsidiaries engaged in pursuing competitive business opportunities across energy services, managed portfolio solutions, and distributed solar solutions for commercial and industrial customers. Such business activities are currently not material to report as a separate business segment. These combined notes to the consolidated financial statements apply to both Edison International and SCE unless otherwise described. Edison International's consolidated financial statements include the accounts of Edison International, SCE, and other wholly owned and controlled subsidiaries. References to Edison International refer to the consolidated group of Edison International and its subsidiaries. References to Edison International Parent and Other refer to Edison International Parent and its competitive subsidiaries. SCE's consolidated financial statements include the accounts of SCE and its wholly owned and controlled subsidiaries. All intercompany transactions have been eliminated from the consolidated financial statements.

Edison International's and SCE's significant accounting policies were described in Note 1 of "Notes to Consolidated Financial Statements" included in Edison International's and SCE's combined Annual Report on Form 10-K for the year-ended December 31, 2016 (the "2016 Form 10-K"). This quarterly report should be read in conjunction with the financial statements and notes included in the 2016 Form 10-K.

In the opinion of management, all adjustments, consisting of recurring accruals, have been made that are necessary to fairly state the consolidated financial position, results of operations, and cash flows in accordance with accounting principles generally accepted in the United States ("GAAP") for the periods covered by this quarterly report on Form 10-Q. The results of operations for the three- and nine-month periods ended September 30, 2017 are not necessarily indicative of the operating results for the full year.

The December 31, 2016 financial statement data was derived from audited financial statements, but does not include all disclosures required by GAAP.

During the fourth quarter of 2016, Edison International and SCE early adopted an accounting standard for share-based payments using the modified retrospective approach, effective January 1, 2016. Prior year financial statements have been updated to reflect the modified retrospective application of this accounting standard. For further information, see Note 1 and Note 18 of "Notes to Consolidated Financial Statements" included in the 2016 Form 10-K and Note 2 and Note 7 of this Form 10-Q.

Cash Equivalents

Cash equivalents includes investments in money market funds. Generally, the carrying value of cash equivalents equals the fair value, as these investments have original maturities of three months or less. The cash equivalents were as follows:

	Edison International				SCE
(in millions)	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Money market funds	$	49	$	41	$	25	$	18

Cash is temporarily invested until required for check clearing. Checks issued, but not yet paid by the financial institution, are reclassified from cash to accounts payable at the end of each reporting period as follows:

	Edison International				SCE
(in millions)	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Book balances reclassified to accounts payable	$	85	$	138	$	85	$	136

Goodwill

Edison International assesses goodwill through annual goodwill impairment tests, at the reporting unit level as of October 1st of each year. Edison International updates these tests between annual tests if events occur or circumstances change such that it is more likely than not that the fair value of a reporting unit is below its carrying value. In connection with a strategic review of the Edison Energy Group's competitive businesses, Edison International evaluated the recoverability of goodwill and recorded an impairment of SoCore Energy's goodwill totaling $16.5 million ($10 million after-tax) in the second quarter of 2017. As of September 30, 2017, goodwill is comprised of $78 million at the Edison Energy reporting unit and $5 million at the SoCore Energy reporting unit.

Earnings Per Share

Edison International computes earnings per common share ("EPS") using the two-class method, which is an earnings allocation formula that determines EPS for each class of common stock and participating security. Edison International's participating securities are stock-based compensation awards payable in common shares, including performance shares and restricted stock units, which earn dividend equivalents on an equal basis with common shares once the awards are vested. EPS attributable to Edison International common shareholders was computed as follows:

	Three months ended September 30,				Nine months ended September 30,
(in millions, except per-share amounts)	2017		2016		2017		2016
Basic earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$	470	$	421	$	1,110	$	983
Participating securities dividends	—		—		—		—
Income from continuing operations available to common shareholders	$	470	$	421	$	1,110	$	983
Weighted average common shares outstanding	326		326		326		326
Basic earnings per share – continuing operations	$	1.44	$	1.29	$	3.41	$	3.01
Diluted earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$	470	$	421	$	1,110	$	983
Participating securities dividends	—		—		—		—
Income from continuing operations available to common shareholders	$	470	$	421	$	1,110	$	983
Income impact of assumed conversions	—		—		—		—
Income from continuing operations available to common shareholders and assumed conversions	$	470	$	421	$	1,110	$	983
Weighted average common shares outstanding	326		326		326		326
Incremental shares from assumed conversions	2		4		3		4
Adjusted weighted average shares – diluted	328		330		329		330
Diluted earnings per share – continuing operations	$	1.43	$	1.27	$	3.38	$	2.98

In addition to the participating securities discussed above, Edison International also may award stock options, which are payable in common shares and are included in the diluted earnings per share calculation. Stock option awards to purchase 1,365,671 and 42,890 shares of common stock for the three months ended September 30, 2017 and 2016, respectively, and 1,373,736 and 166,057 shares for the nine months ended September 30, 2017 and 2016, respectively, were outstanding, but were not included in the computation of diluted earnings per share because the effect would have been antidilutive.

Asset Retirement Obligation

During 2017, SCE recorded revisions to its asset retirement obligation ("ARO") resulting in an increase of $142 million. The revisions resulted from an updated decommissioning cost estimate for Palo Verde and the expected decommissioning of a hydroelectric facility.

New Accounting Guidance

Accounting Guidance Not Yet Adopted

In May 2014, the Financial Accounting Standards Board ("FASB") issued an accounting standards update on revenue recognition and further amended the standard in 2016 and 2017. Under the new standard, revenue is recognized when (or as) a good or service is transferred to the customer and the customer obtains control of the good or service. This standard will be adopted on January 1, 2018. Edison International and SCE have completed the evaluation of all significant revenue streams. Edison International and SCE do not believe the adoption of this standard will have a material impact on the financial position or results of operations. For the nine months ended September 30, 2017, approximately 95% of total operating revenue arises from SCE's tariff offerings that provide electricity to customers. For such arrangements, revenue from contracts with customers will be equivalent to the electricity supplied and billed in that period (including estimated billings). As such, there will not be a change in the timing or pattern of revenue recognition for such sales. Edison International and SCE are in the process of implementing the system and process changes necessary to comply with this standard's enhanced disclosure requirements. Edison International and SCE plan to disaggregate customer contract revenue between revenue from earnings activities and revenue from cost-recovery activities. Some revenue arrangements, such as alternative revenue programs which include balancing account over- and under-collections, are excluded from the scope of the new standard and, therefore, will be accounted for and presented separately from revenues recognized under the new standard on the Edison International and SCE consolidated financial statements. Edison International and SCE will adopt the standard by using the modified retrospective method by recognizing a cumulative effect adjustment to the opening balance of retained earnings on January 1, 2018. Edison International and SCE do not expect the cumulative effect adjustment to be material.

In January 2016, the FASB issued an accounting standards update that amends the guidance on the classification and measurement of financial instruments. The amendments require equity investments (excluding those accounted for under the equity method or those that result in consolidation) to be measured at fair value, with changes in fair value recognized in net income. It also amends certain disclosure requirements associated with the fair value of financial instruments. In addition, the new guidance requires financial assets and financial liabilities to be presented separately in the notes to the financial statements, grouped by measurement category and form of financial asset. Edison International and SCE will adopt this guidance effective January 1, 2018. SCE's nuclear decommissioning trust investments contain equity investments that are classified as available-for-sale. Due to regulatory mechanisms, the change in fair value of these investments has no impact on net income and, therefore, the adoption of this standard is not expected to have a material impact on Edison International's and SCE's consolidated financial statements.

In February 2016, the FASB issued an accounting standards update related to lease accounting including enhanced disclosures. Under the new standard, a lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified assets for a period of time in exchange for consideration. Lessees will need to recognize leases on the balance sheet as a right-of-use asset and a related lease liability, and classify the leases as either operating or finance. The liability will be equal to the present value of lease payments. The asset will be based on the liability, subject to adjustment, such as for initial direct costs. Operating leases will result in straight-line expense while finance leases will result in a higher initial expense pattern due to the interest component. SCE, as a regulated entity, is permitted to continue to have straight-line expense for finance leases, assuming the rate recovery is based upon current payments. Lessees can elect to exclude from the balance sheet short-term contracts one year or less. This guidance is effective January 1, 2019. Early adoption is permitted, but Edison International and SCE do not expect to elect early adoption. The adoption of this standard will increase right-of-use assets and lease liabilities in Edison International's and SCE's consolidated balance sheets. Edison International and SCE are currently evaluating the impact this standard will have on the results of operations and statements of cash flows and lease disclosures.

The FASB also issued an accounting standards update related to the impairment of financial instruments, effective January 1, 2020. The new guidance provides an impairment model, known as the current expected credit loss model, which is based on expected credit losses rather than incurred losses. Edison International and SCE are currently evaluating the impact of this new guidance.

The FASB also issued accounting standards updates related to the presentation and classification of certain cash receipts and payments in the statement of cash flows, including a change to the amount of cash, cash equivalents, and restricted cash explained when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. These standards are effective January 1, 2018 and require retrospective application. Restricted cash as of September 30, 2017 was $15 million at Edison International and was less than $1 million at SCE.

In January 2017, the FASB issued an accounting standards update to simplify the accounting for goodwill impairment. This accounting standards update changes the procedural steps in applying the goodwill impairment test. A goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. Edison International will apply this guidance to the goodwill impairment test beginning in 2020.

In March 2017, the FASB issued an accounting standards update which amends the current requirements related to the presentation of the components of net periodic benefit cost for an entity's defined benefit pension and other postretirement plans. The adoption of this standard is not expected to have a material impact on Edison International's and SCE's financial position or results of operations, but will result in the separate presentation of service costs as an operating expense and non-service costs within other income and expense and limit the capitalization of benefit costs to the service cost component. During the three and nine months ended September 30, 2017, service costs totaled $45 million and $135 million, respectively, for Edison International and $44 million and $132 million, respectively, for SCE. During the three and nine months ended September 30, 2017, non-service costs were $(14) million and $(32) million, respectively, for Edison International and $(15) million and $(45) million, respectively, for SCE. The new standards update is effective on January 1, 2018. It is required to be applied on a retrospective basis for the presentation of the service cost component and the other components of net benefit cost and on a prospective basis for the capitalization of only the service cost component of net benefit cost.

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Consolidated Statements of Changes in Equity

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Consolidated Statements of Changes in Equity

Consolidated Statements of Changes in Equity

The following table provides Edison International's changes in equity for the nine months ended September 30, 2017:

	Equity Attributable to Common Shareholders											Noncontrolling Interests
(in millions, except per-share amounts)	Common Stock		Accumulated Other Comprehensive Loss			Retained Earnings			Subtotal			Preferred and Preference Stock			Total Equity
Balance at December 31, 2016	$	2,505	$	(53	)	$	9,544		$	11,996		$	2,191		$	14,187
Net income	—		—			1,110			1,110			94			1,204
Other comprehensive income	—		5			—			5			—			5
Common stock dividends declared ($1.6275 per share)	—		—			(530		)	(530		)	—			(530		)
Dividends to noncontrolling interests	—		—			—			—			(94		)	(94		)
Stock-based compensation	—		—			(165		)	(165		)	—			(165		)
Non-cash stock-based compensation	15		—						15			—			15
Issuance of preference stock	—		—			—			—			463			463
Redemption of preference stock	—		—			(15		)	(15		)	(460		)	(475		)
Balance at September 30, 2017	$	2,520	$	(48	)	$	9,944		$	12,416		$	2,194		$	14,610

The following table provides Edison International's changes in equity for the nine months ended September 30, 2016:

	Equity Attributable to Common Shareholders													Noncontrolling Interests
(in millions, except per-share amounts)	Common Stock			Accumulated Other Comprehensive Loss			Retained Earnings				Subtotal			Preferred and Preference Stock			Total Equity
Balance at December 31, 2015	$	2,484		$	(56	)	$	8,940			$	11,368		$	2,020		$	13,388
Net income	—			—			982			1	982			92			1,074
Other comprehensive income	—			5			—				5			—			5
Common stock dividends declared ($1.4400 per share)	—			—			(469		)		(469		)	—			(469		)
Dividends to noncontrolling interests	—			—			—				—			(92		)	(92		)
Stock-based compensation	(1		)	—			(30		)	1	(31		)	—			(31		)
Non-cash stock-based compensation	18			—			—				18			—			18
Issuance of preference stock	—			—			—				—			294			294
Redemption of preference stock	—			—			(2		)		(2		)	(123		)	(125		)
Balance at September 30, 2016	$	2,501		$	(51	)	$	9,421			$	11,871		$	2,191		$	14,062

¹   Edison International adopted an accounting standard related to share-based payments during the fourth quarter of 2016, effective January 1, 2016. See Note 1 for further information. The table above reflects the adoption of this standard on January 1, 2016. Net income and stock-based compensation (as previously reported) were $965 million and $(72) million, respectively, for the nine months ended September 30, 2016.

The following table provides SCE's changes in equity for the nine months ended September 30, 2017:

	Equity Attributable to Edison International
(in millions)	Common Stock		Additional Paid-in Capital			Accumulated Other Comprehensive Loss			Retained Earnings			Preferred and Preference Stock			Total Equity
Balance at December 31, 2016	$	2,168	$	657		$	(20	)	$	9,433		$	2,245		$	14,483
Net income	—		—			—			1,215			—			1,215
Other comprehensive income	—		—			2			—			—			2
Dividends declared on common stock	—		—			—			(573		)	—			(573		)
Dividends declared on preferred and preference stock	—		—			—			(94		)	—			(94		)
Stock-based compensation	—		—			—			(36		)	—			(36		)
Non-cash stock-based compensation	—		8			—			—			—			8
Issuance of preference stock	—		(12		)	—			—			475			463
Redemption of preference stock	—		15			—			(15		)	(475		)	(475		)
Balance at September 30, 2017	$	2,168	$	668		$	(18	)	$	9,930		$	2,245		$	14,993

The following table provides SCE's changes in equity for the nine months ended September 30, 2016:

	Equity Attributable to Edison International
(in millions)	Common Stock		Additional Paid-in Capital			Accumulated Other Comprehensive Loss			Retained Earnings				Preferred and Preference Stock			Total Equity
Balance at December 31, 2015	$	2,168	$	652		$	(22	)	$	8,804			$	2,070		$	13,672
Net income	—		—			—			1,140			1	—			1,140
Other comprehensive income	—		—			3			—				—			3
Dividends declared on common stock	—		—			—			(510		)		—			(510		)
Dividends declared on preferred and preference stock	—		—			—			(92		)		—			(92		)
Stock-based compensation	—		—			—			(43		)	1	—			(43		)
Non-cash stock-based compensation	—		8			—			—				—			8
Issuance of preference stock	—		(6		)	—			—				300			294
Redemption of preference stock	—		2			—			(2		)		(125		)	(125		)
Balance at September 30, 2016	$	2,168	$	656		$	(19	)	$	9,297			$	2,245		$	14,347

¹   SCE adopted an accounting standard related to share-based payments during the fourth quarter of 2016, effective January 1, 2016. See Note 1 for further information. The table above reflects the adoption of this standard on January 1, 2016. Net income and stock-based compensation (as previously reported) were $1.13 billion and $(49) million, respectively, for the nine months ended September 30, 2016.

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Variable Interest Entities

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entities

Variable Interest Entities

A VIE is defined as a legal entity that meets one of two conditions: (1) the equity owners do not have sufficient equity at risk, or (2) the holders of the equity investment at risk, as a group, lack any of the following three characteristics: decision-making rights, the obligation to absorb losses, or the right to receive the expected residual returns of the entity. The primary beneficiary is identified as the variable interest holder that has both the power to direct the activities of the VIE that most significantly impact the entity's economic performance and the obligation to absorb losses or the right to receive benefits from the entity that could potentially be significant to the VIE. The primary beneficiary is required to consolidate the VIE. A subsidiary of Edison International is the primary beneficiary of entities that own rooftop solar projects. Commercial and operating activities are generally the factors that most significantly impact the economic performance of such VIEs. Commercial and operating activities include construction, operation and maintenance, fuel procurement, dispatch, and compliance with regulatory and contractual requirements.

Variable Interest in VIEs that are not Consolidated

Power Purchase Agreements

SCE has power purchase agreements ("PPAs") that are classified as variable interests in VIEs, including tolling agreements through which SCE provides the natural gas to fuel the plants and contracts with qualifying facilities that contain variable pricing provisions based on the price of natural gas. SCE has concluded that it is not the primary beneficiary of these VIEs since it does not control the commercial and operating activities of these entities. Since payments for capacity are the primary source of income, the most significant economic activity for these VIEs is the operation and maintenance of the power plants.

As of the balance sheet date, the carrying amount of assets and liabilities in SCE's consolidated balance sheet that relate to its involvement with VIEs result from amounts due under the PPAs. Under these contracts, SCE recovers the costs incurred through demonstration of compliance with its California Public Utilities Commission ("CPUC")-approved long-term power procurement plans. SCE has no residual interest in the entities and has not provided or guaranteed any debt or equity support, liquidity arrangements, performance guarantees, or other commitments associated with these contracts other than the purchase commitments described in Note 11 of the 2016 Form 10-K. As a result, there is no significant potential exposure to loss to SCE from its variable interest in these VIEs. The aggregate contracted capacity dedicated to SCE from these VIE projects was 4,858 MW and 4,349 MW at September 30, 2017 and 2016, respectively, and the amounts that SCE paid to these projects were $325 million and $313 million for the three months ended September 30, 2017 and 2016, respectively, and $571 million and $532 million for nine months ended September 30, 2017 and 2016, respectively. These amounts are recoverable in customer rates, subject to reasonableness review.

Unconsolidated Trusts of SCE

SCE Trust I, Trust II, Trust III, Trust IV, Trust V, and Trust VI were formed in 2012, 2013, 2014, 2015, 2016, and 2017, respectively, for the exclusive purpose of issuing the 5.625%, 5.10%, 5.75%, 5.375%, 5.45%, and 5.00% trust preference securities, respectively ("trust securities"). The trusts are VIEs. SCE has concluded that it is not the primary beneficiary of these VIEs as it does not have the obligation to absorb the expected losses or the right to receive the expected residual returns of the trusts. SCE Trust I, Trust II, Trust III, Trust IV, Trust V and Trust VI issued to the public trust securities in the face amounts of $475 million, $400 million, $275 million, $325 million, $300 million, and $475 million (cumulative, liquidation amounts of $25 per share), respectively, and $10,000 of common stock each to SCE. The trusts invested the proceeds of these trust securities in Series F, Series G, Series H, Series J, Series K, and Series L Preference Stock issued by SCE in the principal amounts of $475 million, $400 million, $275 million, $325 million, $300 million, and $475 million (cumulative, $2,500 per share liquidation values), respectively, which have substantially the same payment terms as the respective trust securities.

The Series F, Series G, Series H, Series J, Series K, and Series L Preference Stock and the corresponding trust securities do not have a maturity date. Upon any redemption of any shares of the Series F, Series G, Series H, Series J, Series K, or Series L Preference Stock, a corresponding dollar amount of trust securities will be redeemed by the applicable trust. The applicable trust will make distributions at the same rate and on the same dates on the applicable series of trust securities if and when the SCE board of directors declares and makes dividend payments on the related Preference Stock. The applicable trust will use any dividends it receives on the related Preference Stock to make its corresponding distributions on the applicable series of trust securities. If SCE does not make a dividend payment to any of these trusts, SCE would be prohibited from paying dividends on its common stock. SCE has fully and unconditionally guaranteed the payment of the trust securities and trust distributions, if and when SCE pays dividends on the related Preference Stock.

In July 2017, SCE Trust I redeemed $475 million of trust securities from the public and $10,000 of common stock from SCE. As a result in September 2017, SCE Trust I was terminated. The Trust II, Trust III, Trust IV, and Trust V balance sheets as of September 30, 2017 and December 31, 2016, consisted of investments of $400 million, $275 million, $325 million, and $300 million in the Series G, Series H, Series J, and Series K Preference Stock, respectively, $400 million, $275 million, $325 million, and $300 million of trust securities, respectively, and $10,000 each of common stock. The Trust VI balance sheet as of September 30, 2017 consisted of investments of $475 million in the Series L Preference Stock, $475 million of trust securities, and $10,000 of common stock.

The following table provides a summary of the trusts' income statements:

	Three months ended September 30,
(in millions)	Trust I		Trust II		Trust III		Trust IV		Trust V		Trust VI
2017
Dividend income	$	1	$	5	$	4	$	4	$	4	$	6
Dividend distributions	1		5		4		4		4		6
2016
Dividend income	$	7	$	5	$	4	$	4	$	4	*
Dividend distributions	7		5		4		4		4		*

	Nine months ended September 30,
(in millions)	Trust I		Trust II		Trust III		Trust IV		Trust V		Trust VI
2017
Dividend income	$	14	$	15	$	12	$	13	$	12	$	6
Dividend distributions	14		15		12		13		12		6
2016
Dividend income	$	20	$	15	$	12	$	13	$	9	*
Dividend distributions	20		15		12		13		9		*

* Not applicable.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Recurring Fair Value Measurements

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (referred to as an "exit price"). Fair value of an asset or liability considers assumptions that market participants would use in pricing the asset or liability, including assumptions about nonperformance risk. As of September 30, 2017 and December 31, 2016, nonperformance risk was not material for Edison International and SCE.

Assets and liabilities are categorized into a three-level fair value hierarchy based on valuation inputs used to determine fair value.

Level 1 – The fair value of Edison International's and SCE's Level 1 assets and liabilities is determined using unadjusted quoted prices in active markets that are available at the measurement date for identical assets and liabilities. This level includes exchange-traded equity securities, U.S. treasury securities, mutual funds, and money market funds.

Level 2 – Edison International's and SCE's Level 2 assets and liabilities include fixed income securities, primarily consisting of U.S. government and agency bonds, municipal bonds and corporate bonds, and over-the-counter derivatives. The fair value of fixed income securities is determined using a market approach by obtaining quoted prices for similar assets and liabilities in active markets and inputs that are observable, either directly or indirectly, for substantially the full term of the instrument.

The fair value of SCE's over-the-counter derivative contracts is determined using an income approach. SCE uses standard pricing models to determine the net present value of estimated future cash flows. Inputs to the pricing models include forward published or posted clearing prices from exchanges (New York Mercantile Exchange and Intercontinental Exchange) for similar instruments and discount rates. A primary price source that best represents trade activity for each market is used to develop observable forward market prices in determining the fair value of these positions. Broker quotes, prices from exchanges, or comparison to executed trades are used to validate and corroborate the primary price source. These price quotations reflect mid-market prices (average of bid and ask) and are obtained from sources believed to provide the most liquid market for the commodity.

Level 3 – The fair value of SCE's Level 3 assets and liabilities is determined using the income approach through various models and techniques that require significant unobservable inputs. This level includes derivative contracts that trade infrequently such as congestion revenue rights ("CRRs"). Edison International Parent and Other does not have any Level 3 assets and liabilities.

Assumptions are made in order to value derivative contracts in which observable inputs are not available. In circumstances where fair value cannot be verified with observable market transactions, it is possible that a different valuation model could produce a materially different estimate of fair value. Modeling methodologies, inputs, and techniques are reviewed and assessed as markets continue to develop and more pricing information becomes available and the fair value is adjusted when it is concluded that a change in inputs or techniques would result in a new valuation that better reflects the fair value of those derivative contracts. See Note 6 for a discussion of derivative instruments.

SCE

The following table sets forth assets and liabilities of SCE that were accounted for at fair value by level within the fair value hierarchy:

	September 30, 2017
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral1		Total
Assets at fair value
Derivative contracts	$	—	$	14	$	24	$	—	$	38
Other	36		—		—		—		36
Nuclear decommissioning trusts:
Stocks2	1,655		—		—		—		1,655
Fixed Income3	1,057		1,588		—		—		2,645
Short-term investments, primarily cash equivalents	34		109		—		—		143
Subtotal of nuclear decommissioning trusts4	2,746		1,697		—		—		4,443
Total assets	2,782		1,711		24		—		4,517
Liabilities at fair value
Derivative contracts	—		1		2		—		3
Total liabilities	—		1		2		—		3
Net assets	$	2,782	$	1,710	$	22	$	—	$	4,514

	December 31, 2016
(in millions)	Level 1		Level 2		Level 3			Netting and Collateral1		Total
Assets at fair value
Derivative contracts	$	—	$	6	$	68		$	—	$	74
Other	33		—		—			—		33
Nuclear decommissioning trusts:
Stocks2	1,547		—		—			—		1,547
Fixed Income3	865		1,751		—			—		2,616
Short-term investments, primarily cash equivalents	36		170		—			—		206
Subtotal of nuclear decommissioning trusts4	2,448		1,921		—			—		4,369
Total assets	2,481		1,927		68			—		4,476
Liabilities at fair value
Derivative contracts	—		—		1,157			—		1,157
Total liabilities	—		—		1,157			—		1,157
Net assets (liabilities)	$	2,481	$	1,927	$	(1,089	)	$	—	$	3,319

¹  Represents the netting of assets and liabilities under master netting agreements and cash collateral across the levels of the fair value hierarchy. Netting among positions classified within the same level is included in that level.

²  Approximately 69% and 70% of SCE's equity investments were located in the United States at September 30, 2017 and December 31, 2016, respectively.

³  Includes corporate bonds, which were diversified and included collateralized mortgage obligations and other asset backed securities of $80 million and $79 million at September 30, 2017 and December 31, 2016, respectively.

⁴  Excludes net payables of $28 million and $127 million at September 30, 2017 and December 31, 2016, respectively, which consist of interest and dividend receivables as well as receivables and payables related to SCE's pending securities sales and purchases.

Edison International Parent and Other

Edison International Parent and Other assets measured at fair value consisted of money market funds of $24 million and $23 million at September 30, 2017 and December 31, 2016, respectively, classified as Level 1.

SCE Fair Value of Level 3

The following table sets forth a summary of changes in SCE's fair value of Level 3 net derivative assets and liabilities:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Fair value of net liabilities at beginning of period	$	(1,012	)	$	(1,170	)	$	(1,089	)	$	(1,148	)
Total realized/unrealized gains (losses):
Included in regulatory assets and liabilities1	120			8			54			(14		)
Settlements	—			(1		)	—			(1		)
Contract amendment2	—			—			143			—
Normal purchase and normal sale designation3	$	914		$	—		$	914		$	—
Fair value of net assets (liabilities) at end of period	$	22		$	(1,163	)	$	22		$	(1,163	)
Change during the period in unrealized gains and losses related to assets and liabilities held at the end of the period	$	6		$	(57	)	$	6		$	(122	)

¹  Due to regulatory mechanisms, SCE's realized and unrealized gains and losses are recorded as regulatory assets and liabilities.

² Represents a tolling contract that was amended during the second quarter of 2017, which is no longer accounted for as a derivative as of September 30, 2017.

³  During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

Edison International and SCE recognize the fair value for transfers in and transfers out of each level at the end of each reporting period. There were no material transfers between any levels during 2017 and 2016.

Valuation Techniques Used to Determine Fair Value

The process of determining fair value is the responsibility of SCE's risk management department, which reports to SCE's chief financial officer. This department obtains observable and unobservable inputs through broker quotes, exchanges, and internal valuation techniques that use both standard and proprietary models to determine fair value. Each reporting period, the risk and finance departments collaborate to determine the appropriate fair value methodologies and classifications for each derivative. Inputs are validated for reasonableness by comparison against prior prices, other broker quotes, and volatility fluctuation thresholds. Inputs used and valuations are reviewed period-over-period and compared with market conditions to determine reasonableness.

The following table sets forth SCE's valuation techniques and significant unobservable inputs used to determine fair value for significant Level 3 assets and liabilities:

	Fair Value (in millions)					Significant	Range
	Assets		Liabilities		Valuation Technique(s)	Unobservable Input	(Weighted Average)
Congestion revenue rights
September 30, 2017	$	24	$	—	Market simulation model and auction prices	Load forecast	3,708 MW - 22,840 MW
						Power prices1	$3.65 - $99.58
						Gas prices2	$2.51 - $4.87
December 31, 2016	67		—		Market simulation model and auction prices	Load forecast	3,708 MW - 22,840 MW
						Power prices1	$3.65 - $99.58
						Gas prices2	$2.51 - $4.87
Tolling3
December 31, 2016	—		1,154		Option model	Volatility of gas prices	15% - 48% (20%)
						Volatility of power prices	29% - 71% (40%)
						Power prices	$23.40 - $51.24 ($34.70)

¹  Prices are in dollars per megawatt-hour.

²  Prices are in dollars per million British thermal units.

³ During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

Level 3 Fair Value Sensitivity

Congestion Revenue Rights

For CRRs, where SCE is the buyer, generally increases (decreases) in forecasted load in isolation would result in increases (decreases) to the fair value. In general, an increase (decrease) in electricity and gas prices at illiquid locations tends to result in increases (decreases) to fair value; however, changes in electricity and gas prices in opposite directions may have varying results on fair value.

Nuclear Decommissioning Trusts

SCE's nuclear decommissioning trust investments include equity securities, U.S. treasury securities, and other fixed income securities. Equity and treasury securities are classified as Level 1 as fair value is determined by observable market prices in active or highly liquid and transparent markets. The remaining fixed income securities are classified as Level 2. The fair value of these financial instruments is based on evaluated prices that reflect significant observable market information such as reported trades, actual trade information of similar securities, benchmark yields, broker/dealer quotes, issuer spreads, bids, offers, and relevant credit information. There are no securities classified as Level 3 in the nuclear decommissioning trusts.

Fair Value of Debt Recorded at Carrying Value

The carrying value and fair value of Edison International's and SCE's long-term debt (including current portion of long-term debt) are as follows:

	September 30, 2017				December 31, 2016
(in millions)	Carrying Value1		Fair Value		Carrying Value1		Fair Value
SCE	$	11,005	$	12,554	$	10,333	$	11,539
Edison International	12,221		13,788		11,156		12,368

¹   Carrying value is net of debt issuance costs.

The fair value of Edison International's and SCE's short-term and long-term debt is classified as Level 2 and is based on evaluated prices that reflect significant observable market information such as reported trades, actual trade information of similar securities, benchmark yields, broker/dealer quotes of new issue prices, and relevant credit information.

The carrying value of Edison International's and SCE's trade receivables and payables, other investments, and short-term debt approximates fair value.

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Debt and Credit Agreements

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt and Credit Agreements

Debt and Credit Agreements

Long-Term Debt

During the first quarter of 2017, SCE borrowed $300 million under a Term Loan Agreement due July 2018, with a variable interest rate based on the London Interbank Offered Rate plus 65 basis points. The proceeds were used for general corporate purposes.

During the first quarter of 2017, SCE reissued $135 million of 2.625% pollution-control bonds subject to mandatory remarketing in December 2023. The proceeds were used for general corporate purposes.

During the first quarter of 2017 and in September 2017, SCE issued $700 million and $300 million, respectively, of 4.00% first and refunding mortgage bonds due in 2047. The aggregate principal amount of these bonds totaled $1.0 billion and the proceeds from the first quarter issuance were used to repay commercial paper borrowings, to fund SCE's capital program and for general corporate purposes. The proceeds from the September 2017 issuance were used to repay the $300 million Term Loan Agreement discussed above.

During the first quarter of 2017, Edison International issued $400 million of 2.125% senior notes due in 2020. The proceeds were used to repay commercial paper borrowings and for general corporate purposes. In August 2017, Edison International issued $400 million of 2.40% senior notes due in 2022. In September 2017, the proceeds from the August 2017 issuance were used to repay $400 million of Edison International's 3.75% senior notes.

Project Financings

In October 2017, indirect subsidiaries of Edison Energy Group entered into approximately $100 million in non-recourse debt and tax equity financings to support investments in ground mount solar projects. The tax equity investor in these solar projects will receive an initial allocation of 99% of taxable losses and tax credits, followed by 67% of taxable income and losses after the initial period and 15.6% of cash flows until certain conditions are met, including attaining a specified rate of return.  A subsidiary of Edison Energy Group has the option after certain conditions are met to purchase the tax equity investor's interest at the higher of fair value or the after-tax amount necessary to achieve a specified 20-year rate of return.

Credit Agreements and Short-Term Debt

SCE and Edison International Parent have multi-year revolving credit facilities of $2.75 billion and $1.25 billion, respectively. During the third quarter of 2017, SCE and Edison International Parent extended the maturity date to July 2022. SCE's credit facility is generally used to support commercial paper borrowings and letters of credit issued for procurement-related collateral requirements, balancing account undercollections and for general corporate purposes, including working capital requirements to support operations and capital expenditures. Edison International Parent's credit facility is used to support commercial paper borrowings and for general corporate purposes.

At September 30, 2017, SCE's outstanding commercial paper, net of discount, was $329 million at a weighted-average interest rate of 1.29%. At September 30, 2017, letters of credit issued under SCE's credit facility aggregated $267 million and are scheduled to expire in twelve months or less. At December 31, 2016, the outstanding commercial paper, net of discount, was $769 million at a weighted-average interest rate of 0.9%.

At September 30, 2017, Edison International Parent's outstanding commercial paper, net of discount, was $573 million at a weighted-average interest rate of 1.37%. At December 31, 2016, the outstanding commercial paper, net of discount, was $538 million at a weighted-average interest rate of 0.97%.

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Derivative Instruments

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

Derivative financial instruments are used to manage exposure to commodity price risk. These risks are managed in part by entering into forward commodity transactions, including options, swaps, and futures. To mitigate credit risk from counterparties in the event of nonperformance, master netting agreements are used whenever possible and counterparties may be required to pledge collateral depending on the creditworthiness of each counterparty and the risk associated with the transaction.

Commodity Price Risk

Commodity price risk represents the potential impact that can be caused by a change in the market value of a particular commodity. SCE's electricity price exposure arises from energy purchased from and sold to wholesale markets as a result of differences between SCE's load requirements and the amount of energy delivered from its generating facilities and PPAs. SCE's natural gas price exposure arises from natural gas purchased for the Mountainview power plant and peaker plants, qualifying facility contracts where pricing is based on a monthly natural gas index, and PPAs in which SCE has agreed to provide the natural gas needed for generation, referred to as tolling arrangements.

Credit and Default Risk

Credit and default risk represent the potential impact that can be caused if a counterparty were to default on its contractual obligations and SCE would be exposed to spot markets for buying replacement power or selling excess power. In addition, SCE would be exposed to the risk of non-payment of accounts receivable, primarily related to the sales of excess power and realized gains on derivative instruments.

Certain power contracts contain master netting agreements or similar agreements, which generally allow counterparties subject to the agreement to offset amounts when certain criteria are met, such as in the event of default. The objective of netting is to reduce credit exposure. Additionally, to reduce SCE's risk exposures counterparties may be required to pledge collateral depending on the creditworthiness of each counterparty and the risk associated with the transaction.

Certain power contracts contain a provision that requires SCE to maintain an investment grade rating from each of the major credit rating agencies, referred to as a credit-risk-related contingent feature. If SCE's credit rating were to fall below investment grade, SCE may be required to post additional collateral to cover derivative liabilities and the related outstanding payables. The net fair value of all derivative liabilities with these credit-risk-related contingent features was $2 million and $12 million as of September 30, 2017 and December 31, 2016, respectively, for which SCE has posted $15 million and $12 million collateral at September 30, 2017 and December 31, 2016, respectively, to its counterparties for its derivative liabilities and related outstanding payables. If the credit-risk-related contingent features underlying these agreements were triggered on September 30, 2017, SCE would be required to post $15 million of additional collateral of which $13 million is related to outstanding payables that are net of collateral already posted.

Fair Value of Derivative Instruments

SCE presents its derivative assets and liabilities on a net basis on its consolidated balance sheets when subject to master netting agreements or similar agreements. Derivative positions are offset against margin and cash collateral deposits. In addition, SCE has provided collateral in the form of letters of credit. Collateral requirements can vary depending upon the level of unsecured credit extended by counterparties, changes in market prices relative to contractual commitments, and other factors. See Note 4 for a discussion of fair value of derivative instruments. The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:

	September 30, 2017
	Derivative Assets								Derivative Liabilities								Net Asset
(in millions)	Short-Term			Long-Term		Subtotal			Short-Term			Long-Term		Subtotal2
Commodity derivative contracts
Gross amounts recognized	$	37		$	2	$	39		$	4		$	—	$	4		$	35
Gross amounts offset in the consolidated balance sheets	(1		)	—		(1		)	(1		)	—		(1		)	—
Cash collateral posted1	—			—		—			—			—		—			—
Net amounts presented in the consolidated balance sheets	$	36		$	2	$	38		$	3		$	—	$	3		$	35

	December 31, 2016
	Derivative Assets								Derivative Liabilities								Net Liability
(in millions)	Short-Term			Long-Term		Subtotal			Short-Term			Long-Term		Subtotal
Commodity derivative contracts
Gross amounts recognized	$	74		$	1	$	75		$	217		$	941	$	1,158		$	1,083
Gross amounts offset in the consolidated balance sheets	(1		)	—		(1		)	(1		)	—		(1		)	—
Cash collateral posted1	—			—		—			—			—		—			—
Net amounts presented in the consolidated balance sheets	$	73		$	1	$	74		$	216		$	941	$	1,157		$	1,083

¹  In addition, at September 30, 2017 and December 31, 2016, SCE had received $1 million and $2 million, respectively, of collateral that is not offset against derivative assets and is reflected in "Other current liabilities" on the consolidated balance sheets.

²  During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

Income Statement Impact of Derivative Instruments

SCE recognizes realized gains and losses on derivative instruments as purchased power expense and expects that such gains or losses will be part of the purchased power costs recovered from customers. As a result, realized gains and losses do not affect earnings, but may temporarily affect cash flows. Due to expected future recovery from customers, unrealized gains and losses are recorded as regulatory assets and liabilities and therefore also do not affect earnings. The remaining effects of derivative activities and related regulatory offsets are recorded in cash flows from operating activities in the consolidated statements of cash flows.

The following table summarizes the components of SCE's economic hedging activity:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Realized losses	$	(3	)	$	(1	)	$	(8	)	$	(53	)
Unrealized gains (losses)	116			(2		)	37			6

Notional Volumes of Derivative Instruments

The following table summarizes the notional volumes of derivatives used for SCE hedging activities:

		Economic Hedges
Commodity	Unit of Measure	September 30, 2017	December 31, 2016
Electricity options, swaps and forwards	GWh	874	1,816
Natural gas options, swaps and forwards	Bcf	137	36
Congestion revenue rights	GWh	74,849	93,319
Tolling arrangements	GWh	—	61,093

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Income Taxes

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Effective Tax Rate

The table below provides a reconciliation of income tax expense computed at the federal statutory income tax rate to the income tax provision:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Edison International:
Income from continuing operations before income taxes	$	432		$	571		$	1,119		$	1,162
Provision for income tax at federal statutory rate of 35%	151			200			392			407
Increase in income tax from:
State tax, net of federal benefit	7			20			23			30
Property-related1	(201		)	(79		)	(396		)	(296		)
Change related to uncertain tax positions	—			(5		)	(17		)	(4		)
Shared-based compensation2	(4		)	(2		)	(50		)	(17		)
Other	(22		)	(14		)	(35		)	(24		)
Total income tax (benefit) expense from continuing operations	$	(69	)	$	120		$	(83	)	$	96
Effective tax rate	(16.0		)%	21.0		%	(7.4		)%	8.3		%
SCE:
Income from continuing operations before income taxes	$	462		$	607		$	1,249		$	1,291
Provision for income tax at federal statutory rate of 35%	162			212			437			452
Increase in income tax from:
State tax, net of federal benefit	12			25			34			40
Property-related1	(201		)	(79		)	(396		)	(296		)
Change related to uncertain tax positions	(1		)	(7		)	(13		)	(9		)
Shared-based compensation2	(1		)	—			(10		)	(11		)
Other	(6		)	(10		)	(18		)	(25		)
Total income tax (benefit) expense from continuing operations	$	(35	)	$	141		$	34		$	151
Effective tax rate	(7.6		)%	23.2		%	2.7		%	11.7		%

¹   Includes incremental tax benefits related to repair deductions and tax accounting method changes which are required to be flowed back to customers. During the third quarter of 2017, SCE recorded $70 million ($118 million pre-tax) of tax benefits related to tax accounting method changes resulting from the filing of SCE's 2016 tax returns. During the second quarter of 2016, SCE recorded $79 million ($133 million pre-tax) for 2012 – 2014 incremental tax benefits related to repair deductions.

²  Includes state taxes for Edison International and SCE of $10 million and $2 million, respectively, for the nine months ended September 30, 2017. Includes state taxes for Edison International and SCE of $3 million and $2 million, respectively, for the nine months ended September 30, 2016. Refer to Note 1 for further information.

The CPUC requires flow-through ratemaking treatment for the current tax benefit arising from certain property-related and other temporary differences which reverse over time. Flow-through items reduce current authorized revenue requirements in SCE's rate cases and result in a regulatory asset for recovery of deferred income taxes in future periods. The difference between the authorized amounts as determined in SCE's rate cases, adjusted for balancing and memorandum account activities, and the recorded flow-through items also result in increases or decreases in regulatory assets with a corresponding impact on the effective tax rate to the extent that recorded deferred amounts are expected to be recovered in future rates. For further information, see Note 10.

In March 2017, SCE received the final decision on claims against, and counterclaims of, Mitsubishi Heavy Industries, Inc. and related companies (together, "MHI") from the arbitration tribunal, the International Chamber of Commerce, discussed further in Note 11. San Onofre was permanently shut down on June 7, 2013 as a result of failure of replacement steam generators supplied by MHI. With the resolution of the insurance claim against Nuclear Electric Insurance Limited ("NEIL") in October 2015 and the conclusion of the arbitration proceeding against MHI, a tax abandonment loss of $691 million and $1.13 billion for federal and state income tax purposes, respectively, was claimed in the first six months of 2017, resulting in a flow-through tax benefit of approximately $39 million impacting the effective tax rate. Due to the tax abandonment loss recognized during the first nine months of 2017, Edison International and SCE both expect to report federal and California tax losses in 2017.

Unrecognized Tax Benefits

In the first quarter of 2017, Edison International settled all open tax positions with the Internal Revenue Service ("IRS") for taxable years 2007 through 2012. The following table provides a reconciliation of unrecognized tax benefits for 2017 as a result of the audit settlement:

(in millions)	Edison International			SCE
Balance at January 1, 2017	$	471		$	371
Tax positions taken during the current year:
Increases	39			39
Tax positions taken during a prior year:
Increases	1			1
Decreases	(5		)	(4		)
Decreases for settlements during the period	(83		)	(78		)
Balance at September 30, 2017	$	423		$	329

Tax Disputes

In the first quarter of 2017, Edison International settled all open tax positions with the IRS for taxable years 2007 through 2012. Edison International has previously made cash deposits to cover the estimated tax and interest liability from this audit cycle and expects a $7 million refund of this deposited amount.

Tax years that remain open for examination by the IRS and the California Franchise Tax Board are 2014 – 2016 and 2010 – 2016, respectively. Edison International has settled all open tax position with the IRS for taxable years prior to 2013. 

Tax years 1994 – 2006 are currently in settlement negotiations with the California Franchise Tax Board. While we expect to resolve these tax years within the next twelve months, the impacts cannot be reasonably estimated until further progress has been made. Tax years 2007 – 2009 are currently under protest with the California Franchise Tax Board.

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Compensation and Benefit Plans

9 Months Ended

Sep. 30, 2017

Retirement Benefits [Abstract]

Compensation and Benefit Plans

Compensation and Benefit Plans

Pension Plans

Edison International made contributions of $100 million during the nine months ended September 30, 2017, which includes contributions of $64 million by SCE. Edison International expects to make contributions of $15 million during the remainder of 2017, which includes $1 million from SCE. Annual contributions made by SCE to most of SCE's pension plans are anticipated to be recovered through CPUC-approved regulatory mechanisms.

Net periodic pension expense components for continuing operations are:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Edison International:
Service cost	$	36		$	39		$	108		$	117
Interest cost	41			44			123			132
Expected return on plan assets	(53		)	(56		)	(159		)	(168		)
Settlement costs1	—			—			8			—
Amortization of prior service cost	—			1			2			3
Amortization of net loss2	4			9			14			27
Expense under accounting standards	$	28		$	37		$	96		$	111
Regulatory adjustment	(3		)	(9		)	(9		)	(27		)
Total expense recognized	$	25		$	28		$	87		$	84
SCE:
Service cost	$	35		$	38		$	105		$	114
Interest cost	37			41			111			123
Expected return on plan assets	(50		)	(53		)	(150		)	(159		)
Amortization of prior service cost	—			1			2			3
Amortization of net loss2	4			8			12			24
Expense under accounting standards	$	26		$	35		$	80		$	105
Regulatory adjustment	(3		)	(9		)	(9		)	(27		)
Total expense recognized	$	23		$	26		$	71		$	78

¹  Under GAAP, a settlement is recorded when lump-sum payments exceed estimated annual service and interest costs. Lump sum payments made in April 2017 to Edison International executives retiring in 2016 from the Executive Retirement Plan exceeded the estimated service and interest costs, resulting in a partial settlement of that plan. A settlement loss of approximately $7.7 million ($4.6 million after-tax) was recorded at Edison International in the second quarter of 2017.

²  Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $3 million and $1 million, respectively, for the three months ended September 30, 2017, and $8 million and $4 million, respectively, for the nine months ended September 30, 2017. The amount reclassified for Edison International and SCE was $3 million and $2 million, respectively, for the three months ended September 30, 2016, and $9 million and $5 million, respectively, for the nine months ended September 30, 2016.

Postretirement Benefits Other Than Pensions

Edison International made contributions of $16 million during the nine months ended September 30, 2017 and expects to make contributions of $5 million during the remainder of 2017, substantially all of which are expected to be made by SCE. Annual contributions related to SCE employees made to SCE plans are anticipated to be recovered through CPUC-approved regulatory mechanisms and are expected to be, at a minimum, equal to the total annual expense for these plans. Benefits under these plans, with some exceptions, are generally unvested and subject to change. Under the terms of the Edison International Health and Welfare Plan ("PBOP Plan") each participating employer (Edison International or its participating subsidiaries) is responsible for the costs and expenses of all PBOP Plan benefits with respect to its employees and former employees. A participating employer may terminate the PBOP Plan benefits with respect to its employees and former employees, as may SCE (as PBOP Plan sponsor), and, accordingly, the participants' PBOP Plan benefits are not vested benefits.

Net periodic PBOP expense components for continuing operations are:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Edison International:
Service cost	$	9		$	10		$	27		$	30
Interest cost	24			26			72			78
Expected return on plan assets	(27		)	(28		)	(81		)	(84		)
Amortization of prior service cost	—			(1		)	(2		)	(3		)
Total expense	$	6		$	7		$	16		$	21
SCE:
Service cost	$	9		$	10		$	27		$	30
Interest cost	24			26			72			78
Expected return on plan assets	(27		)	(28		)	(81		)	(84		)
Amortization of prior service cost	—			(1		)	(2		)	(3		)
Total expense	$	6		$	7		$	16		$	21

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Investments

9 Months Ended

Sep. 30, 2017

Regulated Entity, Other Assets, Noncurrent [Abstract]

Investments

Investments

Nuclear Decommissioning Trusts

Future decommissioning costs related to SCE's nuclear assets are expected to be funded from independent decommissioning trusts.

The following table sets forth amortized cost and fair value of the trust investments (see Note 4 for a discussion of fair value of the trust investments):

	Longest Maturity Dates	Amortized Cost				Fair Value
(in millions)		September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Stocks	—	$	290	$	319	$	1,655	$	1,547
Municipal bonds	2054	612		659		738		766
U.S. government and agency securities	2067	1,220		1,131		1,298		1,191
Corporate bonds	2057	545		600		609		659
Short-term investments and receivables/payables1	One-year	111		75		115		79
Total		$	2,778	$	2,784	$	4,415	$	4,242

¹ Short-term investments include $114 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 4, 2017 as of December 31, 2016. No repurchase agreements were held as of September 30, 2017.

Trust fund earnings (based on specific identification) increase the trust fund balance and the asset retirement obligation ("ARO") regulatory liability. Unrealized holding gains, net of losses, were $1.6 billion and $1.5 billion at September 30, 2017 and December 31, 2016, respectively.

The following table sets forth a summary of changes in the fair value of the trust:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Balance at beginning of period	$	4,381		$	4,344		$	4,242		$	4,331
Gross realized gains	22			18			134			61
Gross realized losses	(3		)	(1		)	(19		)	(5		)
Unrealized gains, net of losses	65			32			179			153
Other-than-temporary impairments	(2		)	(2		)	(6		)	(10		)
Interest and dividends	28			28			87			88
Income taxes	(9		)	(5		)	(35		)	(47		)
Decommissioning disbursements	(65		)	(38		)	(164		)	(192		)
Administrative expenses and other	(2		)	—			(3		)	(3		)
Balance at end of period	$	4,415		$	4,376		$	4,415		$	4,376

Trust assets are used to pay income taxes. Deferred tax liabilities related to net unrealized gains at September 30, 2017 were $402 million. Accordingly, the fair value of trust assets available to pay future decommissioning costs, net of deferred income taxes, totaled $4.0 billion at September 30, 2017. Due to regulatory mechanisms, changes in assets of the trusts from income or loss items have no impact on operating revenue or earnings.

Decommissioning disbursements are funded from sales of investments of the nuclear decommissioning trusts.

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Regulatory Assets and Liabilities

9 Months Ended

Sep. 30, 2017

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Assets and Liabilities

Regulatory Assets and Liabilities

Regulatory Assets

SCE's regulatory assets included on the consolidated balance sheets are:

(in millions)	September 30, 2017		December 31, 2016
Current:
Regulatory balancing accounts	$	216	$	135
Energy derivatives and other power contracts	203		150
Unamortized investments, net of accumulated amortization	12		49
Other	14		16
Total current	445		350
Long-term:
Deferred income taxes, net of liabilities	5,211		4,478
Pensions and other postretirement benefits	712		710
Energy derivatives and other power contracts	839		947
Unamortized investments, net of accumulated amortization	105		80
San Onofre	730		857
Unamortized loss on reacquired debt	172		184
Regulatory balancing accounts	86		66
Environmental remediation	124		126
Other	49		7
Total long-term	8,028		7,455
Total regulatory assets	$	8,473	$	7,805

Regulatory Liabilities

SCE's regulatory liabilities included on the consolidated balance sheets are:

(in millions)	September 30, 2017		December 31, 2016
Current:
Regulatory balancing accounts	$	1,188	$	736
San Onofre MHI arbitration award1	47		—
Other	46		20
Total current	1,281		756
Long-term:
Costs of removal	2,736		2,847
Recoveries in excess of ARO liabilities2	1,719		1,639
Regulatory balancing accounts	1,344		1,180
Other	59		60
Total long-term	5,858		5,726
Total regulatory liabilities	$	7,139	$	6,482

¹ Represents SCE's net recovery from claims against MHI. See Note 11 for further discussion.

² Represents the cumulative differences between ARO expenses and amounts collected in rates primarily for the decommissioning of SCE's nuclear generation facilities. Decommissioning costs recovered through rates are primarily placed in nuclear decommissioning trusts. This regulatory liability also represents the deferral of realized and unrealized gains and losses on the nuclear decommissioning trust investments. See Note 9 for further discussion.

Net Regulatory Balancing Accounts

The following table summarizes the significant components of regulatory balancing accounts included in the above tables of regulatory assets and liabilities:

(in millions)	September 30, 2017			December 31, 2016
Asset (liability)
Energy resource recovery account	$	190		$	(20	)
New system generation balancing account	(99		)	(6		)
Public purpose programs and energy efficiency programs	(1,178		)	(992		)
Tax accounting memorandum account and pole loading balancing account	(461		)	(142		)
Base rate recovery balancing account	(265		)	(426		)
Department of Energy litigation memorandum account	(156		)	(122		)
Greenhouse gas auction revenue	(63		)	31
FERC balancing accounts	(209		)	(69		)
Other	11			31
Liability	$	(2,230	)	$	(1,715	)

The tax accounting memorandum account (TAMA) provides that tax benefits or costs associated with certain events be tracked and adjusted annually in rates, including tax accounting method changes, changes in tax laws and regulations impacting depreciation or tax repair deductions, forecasted and actual differences in tax repair deductions, and the impact, if any, of a private letter ruling related to compliance with normalization regulations of the IRS. During the third quarter of 2017, SCE recorded $118 million of tax benefits related to tax accounting method changes resulting from the filing of SCE's 2016 tax returns in October 2017.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Third-Party Power Purchase Agreements

During the first nine months of 2017, SCE had existing PPAs that met the critical contract provisions (including completion of major milestones for construction). SCE's net additional commitments for power purchase agreements are estimated to be: $27 million in 2018, $72 million in 2019, $62 million in 2020, $20 million in 2021, and $1.2 billion for the remaining period thereafter. For further information, see Note 11 in the 2016 Form 10-K.

Indemnities

Edison International and SCE have various financial and performance guarantees and indemnity agreements, which are issued in the normal course of business.

Edison International and SCE have provided indemnifications through contracts entered into in the normal course of business. These are primarily indemnifications against adverse litigation outcomes in connection with underwriting agreements, and indemnities for specified environmental liabilities and income taxes with respect to assets sold. Edison International's and SCE's obligations under these agreements may or may not be limited in terms of time and/or amount, and in some instances Edison International and SCE may have recourse against third parties. Edison International and SCE have not recorded a liability related to these indemnities. The overall maximum amount of the obligations under these indemnifications cannot be reasonably estimated.

SCE has indemnified the City of Redlands, California in connection with the Mountainview power plant's California Energy Commission permit for cleanup or associated actions related to groundwater contaminated by perchlorate due to the disposal of filter cake at the City's solid waste landfill. The obligations under this agreement are not limited to a specific time period or subject to a maximum liability. SCE has not recorded a liability related to this indemnity.

Contingencies

In addition to the matters disclosed in these Notes, Edison International and SCE are involved in other legal, tax, and regulatory proceedings before various courts and governmental agencies regarding matters arising in the ordinary course of business. Edison International and SCE believe the outcome of these other proceedings will not, individually or in the aggregate, materially affect its financial position, results of operations and cash flows.

San Onofre Related Matters

Replacement steam generators were installed at San Onofre in 2010 and 2011. On January 31, 2012, a leak suddenly occurred in one of the heat transfer tubes in San Onofre's Unit 3 steam generators. The Unit was safely taken off-line and subsequent inspections revealed excessive tube wear. Unit 2 was off-line for a planned outage when areas of unexpected tube wear were also discovered. On June 6, 2013, SCE decided to permanently retire Units 2 and 3.

San Onofre CPUC Proceedings

In November 2014, the CPUC unanimously approved the Settlement Agreement by and among SCE, The Utility Reform Network, the CPUC's Office of Ratepayer Advocates and San Diego Gas & Electric ("SDG&E"), which was later joined by the Coalition of California Utility Employees and Friends of the Earth, dated November 20, 2014 (the "San Onofre OII Settlement Agreement"), which resolved the CPUC's investigation regarding the steam generator replacement project at San Onofre and the related outages and subsequent shutdown of San Onofre. Subsequently, the San Onofre Order Instituting Investigation ("OII") proceeding record was reopened by a joint ruling of the Assigned Commissioner and the Assigned administrative law judge ("ALJ") to consider whether, in light of SCE not reporting certain ex parte communications on a timely basis, the San Onofre OII Settlement Agreement remained reasonable, consistent with the law, and in the public interest, which is the standard the CPUC applies in reviewing settlements submitted for approval. In comments filed with the CPUC in July 2016, SCE asserted that the San Onofre OII Settlement Agreement continues to meet this standard and therefore should not be disturbed. 

In a December 2016 joint ruling, the Assigned Commissioner and the Assigned ALJ expressed concerns about the extent to which the failure to timely report ex parte communications had impacted the settlement negotiations and directed SCE and SDG&E to meet and confer with the other parties in the San Onofre OII to consider changing the terms of the San Onofre OII Settlement Agreement. In March 2017, SCE and the parties participating in the meet-and-confer process initiated a mediation of the issues identified in the December 2016 joint ruling. On August 15, 2017, SCE notified the CPUC that the parties in the San Onofre OII Settlement Agreement were unable to reach agreement on possible changes to the settlement unanimously approved by the CPUC in 2014. In connection with the termination of the meet-and-confer process, SCE asked the CPUC to affirm that the San Onofre OII Settlement Agreement is fair, reasonable and in the public interest. A number of the parties to the San Onofre OII, however, have requested that the CPUC either modify the San Onofre OII Settlement Agreement or vacate its previous approval of the settlement and reinstate the San Onofre OII for further proceedings. Several of the parties to the meet-and-confer process petitioned the CPUC on a broad range of litigation positions, certain of which included substantial additional disallowances.

On October 10, 2017, the Assigned Commissioner and ALJ issued a Ruling ordering additional process to resolve the San Onofre OII. The Ruling did not set aside nor confirm the San Onofre OII Settlement Agreement but stated that the CPUC required an additional record to address the appropriate cost allocation for the premature shutdown of San Onofre Units 2 and 3, in the event the CPUC decides that the settlement does not meet the CPUC's standards for approval of settlements. The Ruling sets an expedited schedule with a status conference on November 7, 2017 and hearings tentatively scheduled to end in March 2018. The CPUC has not announced the expected timing for a decision.

SCE has recorded a regulatory asset of $730 million at September 30, 2017 to reflect the expected recoveries under the San Onofre OII Settlement Agreement. Management assesses at the end of each reporting period whether regulatory assets are probable of future recovery. SCE assessed the San Onofre regulatory asset at September 30, 2017 and continues to conclude that the asset is probable, though not certain, of recovery based on SCE's knowledge of facts and judgment in applying the relevant regulatory principles to the issue. Such judgment is subject to uncertainty, and regulatory principles and precedents are not necessarily binding and are subject to interpretation.

Additional Challenges related to the Settlement of San Onofre CPUC Proceedings

A federal lawsuit challenging the CPUC's authority to permit rate recovery of San Onofre costs and an application to the CPUC for rehearing of its decision approving the San Onofre OII Settlement Agreement were filed in November and December 2014, respectively. In April 2015, the federal lawsuit was dismissed with prejudice and the plaintiffs in that case appealed the dismissal to the Ninth Circuit in May 2015. In light of the San Onofre OII meet-and-confer sessions, the Ninth Circuit cancelled the hearing that had been scheduled for February 9, 2017 and ordered the parties to notify the Ninth Circuit of the status of the San Onofre OII by May 1, 2017 and periodically thereafter. In October 2017, the Ninth Circuit scheduled a hearing for February 13, 2018 and directed the parties to file a status report on January 30, 2018.

In July 2015, a purported securities class action lawsuit was filed in federal court against Edison International, its then Chief Executive Officer and its then Chief Financial Officer. The complaint was later amended to include SCE's former President as a defendant. The lawsuit alleges that the defendants violated the securities laws by failing to disclose that Edison International had ex parte contacts with CPUC decision-makers regarding the San Onofre OII that were either unreported or more extensive than initially reported. The initial complaint purported to be filed on behalf of a class of persons who acquired Edison International common stock between March 21, 2014 and June 24, 2015 (the "Class Period"). In September 2016, the federal court granted defendants' motion to dismiss the complaint, with an opportunity for plaintiff to amend the complaint. Plaintiff filed an amended complaint, which the federal court dismissed again with an opportunity for the plaintiff to amend the complaint. Plaintiff filed a third amended complaint in May 2017, which extends the Class Period to August 10, 2015. Defendants filed a motion to dismiss the third amended complaint in June 2017, and are awaiting a ruling.

Also in July 2015, a federal shareholder derivative lawsuit was filed against members of the Edison International Board of Directors for breach of fiduciary duty and other claims. The federal derivative lawsuit is based on similar allegations to the federal class action securities lawsuit and seeks monetary damages, including punitive damages, and various corporate governance reforms. An additional federal shareholder derivative lawsuit making essentially the same allegations was filed in August 2015 and was subsequently consolidated with the July 2015 federal derivative lawsuit. In September 2016, the federal court granted defendants' motion to dismiss the consolidated complaint, with an opportunity for plaintiffs to amend the complaint. Plaintiffs did not file an amended complaint by the required date. Plaintiffs' deadline to appeal the federal court's order granting defendants' motion to dismiss lapsed in March 2017 and no appeal was filed.

In October 2015, a shareholder derivative lawsuit was filed in California state court against members of the Edison International Board of Directors for breach of fiduciary duty and other claims, making similar allegations to those in the federal derivative lawsuits discussed above. In light of the ruling in the parallel federal derivative lawsuit discussed above, plaintiff requested that the court voluntarily dismiss the state court action. The action was dismissed in April 2017.

In November 2015, a purported securities class action lawsuit was filed in federal court against Edison International, its then Chief Executive Officer and its Treasurer by an Edison International employee, alleging claims under the Employee Retirement Income Security Act. The complaint purports to be filed on behalf of a class of Edison International employees who were participants in the Edison 401(k) Savings Plan and invested in the Edison International Stock Fund between March 27, 2014 and June 24, 2015. The complaint alleges that defendants breached their fiduciary duties because they knew or should have known that investment in the Edison International Stock Fund was imprudent because the price of Edison International common stock was artificially inflated due to Edison International's alleged failure to disclose certain ex parte communications with CPUC decision-makers related to the San Onofre OII. In July 2016, the federal court granted the defendants' motion to dismiss the lawsuit with an opportunity for the plaintiff to amend her complaint. Plaintiff filed an amended complaint in July 2016, that dismissed Edison International as a named defendant and the remaining defendants filed a motion to dismiss in August 2016. These defendants' motion was heard by the court in November 2016. In June 2017, the federal court again granted defendants' motion to dismiss the lawsuit with an opportunity for the plaintiff to amend her complaint. Plaintiff filed an amended complaint in early July 2017. Defendants have filed motion to dismiss the amended complaint, which was heard by the court in October 2017, and are awaiting a ruling.

Edison International and SCE cannot predict the outcome of the open proceedings.

MHI Claims

SCE pursued claims against MHI, which designed and supplied the replacement steam generators. In October 2013, SCE sent MHI a formal request for binding arbitration under the auspices of the International Chamber of Commerce seeking damages for all losses. SCE alleged contract and tort claims and sought at least $4 billion in damages on behalf of itself and its customers and in its capacity as Operating Agent for San Onofre. MHI denied any liability and asserted counterclaims for $41 million, for which SCE denied any liability. Each of the other San Onofre owners (SDG&E and Riverside) sued MHI, alleging claims arising from MHI's supplying the faulty steam generators. These litigation claims have been stayed pending the arbitration. The other co-owners were added as additional claimants in the arbitration. In March 2017, the arbitration tribunal found MHI liable for breach of contract, but rejected claimants' other claims. The tribunal found that damages were subject to contractual limitations on liability. In addition, the tribunal ordered the claimants to pay MHI's legal costs but rejected MHI's counterclaims. The net recovery awarded to SCE was initially determined to be $52 million. An adjustment to the interest awarded to SCE subsequently reduced the net recovery to $47 million. As a result of uncertainty associated with the allocation of the award under the San Onofre OII Settlement Agreement, SCE recorded a regulatory liability for the net recovery.

Environmental Remediation

SCE records its environmental remediation liabilities when site assessments and/or remedial actions are probable and a range of reasonably likely cleanup costs can be estimated. SCE reviews its sites and measures the liability quarterly, by assessing a range of reasonably likely costs for each identified site using currently available information, including existing technology, presently enacted laws and regulations, experience gained at similar sites, and the probable level of involvement and financial condition of other potentially responsible parties. These estimates include costs for site investigations, remediation, operation and maintenance, monitoring, and site closure. Unless there is a single probable amount, SCE records the lower end of this reasonably likely range of costs (reflected in "Other long-term liabilities") at undiscounted amounts as timing of cash flows is uncertain.

At September 30, 2017, SCE's recorded estimated minimum liability to remediate its 19 identified material sites (sites with a liability balance at September 30, 2017, in which the upper end of the range of the costs is at least $1 million) was $125 million, including $74 million related to San Onofre. In addition to these sites, SCE also has 17 immaterial sites with a liability balance as of September 30, 2017, for which the total minimum recorded liability was $4 million. Of the $129 million total environmental remediation liability for SCE, $123 million has been recorded as a regulatory asset. SCE expects to recover $46 million through an incentive mechanism that allows SCE to recover 90% of its environmental remediation costs at certain sites (SCE may request to include additional sites) and $77 million through a mechanism that allows SCE to recover 100% of the costs incurred at certain sites through customer rates. SCE's identified sites include several sites for which there is a lack of currently available information, including the nature and magnitude of contamination, and the extent, if any, that SCE may be held responsible for contributing to any costs incurred for remediating these sites. Thus, no reasonable estimate of cleanup costs can be made for these sites.

The ultimate costs to clean up SCE's identified sites may vary from its recorded liability due to numerous uncertainties inherent in the estimation process, such as: the extent and nature of contamination; the scarcity of reliable data for identified sites; the varying costs of alternative cleanup methods; developments resulting from investigatory studies; the possibility of identifying additional sites; and the time periods over which site remediation is expected to occur. SCE believes that, due to these uncertainties, it is reasonably possible that cleanup costs at the identified material sites and immaterial sites could exceed its recorded liability by up to $151 million and $8 million, respectively. The upper limit of this range of costs was estimated using assumptions least favorable to SCE among a range of reasonably possible outcomes.

SCE expects to clean up and mitigate its identified sites over a period of up to 30 years. Remediation costs for each of the next five years are expected to range from $5 million to $17 million. Costs incurred for the nine months ended September 30, 2017 and 2016 were $6 million and $3 million, respectively.

Based upon the CPUC's regulatory treatment of environmental remediation costs incurred at SCE, SCE believes that costs ultimately recorded will not materially affect its results of operations, financial position, or cash flows. There can be no assurance, however, that future developments, including additional information about existing sites or the identification of new sites, will not require material revisions to estimates.

Nuclear Insurance

SCE is a member of NEIL, a mutual insurance company owned by entities with nuclear facilities. NEIL provides insurance for nuclear property damage, including damages caused by acts of terrorism up to specified limits, and for accidental outages for active facilities. The amount of nuclear property damage insurance purchased for San Onofre and Palo Verde exceeds the minimum federal requirement of $1.06 billion. If NEIL losses at any nuclear facility covered by the arrangement were to exceed the accumulated funds for these insurance programs, SCE could be assessed retrospective premium adjustments of up to approximately $52 million per year.

Federal law limits public offsite liability claims for bodily injury and property damage from a nuclear incident to the amount of available financial protection, which is currently approximately $13.4 billion. Based on its ownership interests, SCE could be required to pay a maximum of approximately $255 million per nuclear incident. However, it would have to pay no more than approximately $38 million per incident in any one year.

For more information on nuclear insurance coverage, see Note 11 in the 2016 Form 10-K.

Wildfire Insurance

Severe wildfires in California have given rise to large damage claims against California utilities for fire-related losses alleged to be the result of utility practices and/orthe failure of electric and other utility equipment. Invoking a California Court of Appeal decision, plaintiffs pursuing these claims have relied on the doctrine of inverse condemnation, which can impose strict liability (including liability for a claimant's attorneys' fees) for property damage. Drought and other severe weather conditions in California have also increased the duration of the wildfire season and the risk of severe wildfire events. SCE has approximately $1 billion of insurance coverage for wildfire liabilities for the period ending on May 31, 2018. SCE has a self-insured retention of $10 million per wildfire occurrence. Various coverage limitations within the policies that make up this insurance coverage could result in additional self-insured costs in the event of multiple wildfire occurrences during the policy period. SCE or its vegetation management contractors may experience coverage reductions and/or increased insurance costs in future years. No assurance can be given that future losses will not exceed the limits of insurance coverage. In the event of fire-related losses involving utility practices and/or the failure of electric and other utility equipment, SCE may be unable to recover self-insured retention or losses in excess of insurance coverage from customers.

Spent Nuclear Fuel

Under federal law, the U.S. Department of Energy ("DOE") is responsible for the selection and construction of a facility for the permanent disposal of spent nuclear fuel and high-level radioactive waste. The DOE has not met its contractual obligation to accept spent nuclear fuel. Extended delays by the DOE have led to the construction of costly alternatives and associated siting and environmental issues. Currently, both San Onofre and Palo Verde have interim storage for spent nuclear fuel on site sufficient for their current license period.

In June 2010, the United States Court of Federal Claims issued a decision granting SCE and the San Onofre co-owners damages of approximately $142 million (SCE share $112 million) to recover costs incurred through December 31, 2005 for the DOE's failure to meet its obligation to begin accepting spent nuclear fuel from San Onofre. SCE received payment from the federal government in the amount of the damage award. In April 2016, SCE, as operating agent, settled a lawsuit on behalf of the San Onofre owners against the DOE for $162 million, including reimbursement for legal costs (SCE share $124 million) to compensate for damages caused by the DOE's failure to meet its obligation to begin accepting spent nuclear fuel for the period from January 1, 2006 to December 31, 2013. The settlement also provides for a claim submission/audit process for expenses incurred from 2014 – 2016, where SCE will submit a claim for damages caused by the DOE failure to accept spent nuclear fuel each year, followed by a government audit and payment of the claim. This process will make additional legal action to recover damages incurred in 2014 – 2016 unnecessary. The first such claim covering damages for 2014 – 2015 was filed on September 30, 2016 for approximately $56 million. In February 2017, the DOE reviewed the 2014 – 2015 claim submission and reduced the original request to approximately $43 million (SCE share was approximately $34 million) primarily due to DOE allocation limits. SCE accepted the DOE's determination, and the government paid the 2014 – 2015 claim under the terms of the settlement. In October 2017, SCE filed a claim covering damages for 2016 for approximately $59 million. All damages recovered by SCE are subject to CPUC review as to how these amounts would be distributed among customers, shareholders, or to offset fuel decommissioning or storage costs.

In August 2017, SCE settled a dispute brought by Citizens Oversight and an individual that sought to overturn the California Coastal Commission's approval of a coastal development permit granted in October 2015 for the expansion of San Onofre ISFSI (a dry cask storage facility for the long-term, on-site storage of nuclear fuel). The plaintiffs primarily alleged that the California Coastal Commission did not adequately consider alternative, offsite locations for the ISFSI. The parties' settlement permits the current ISFSI project to proceed while steps are taken to identify the potential for moving the fuel offsite in the future. In the settlement, SCE agreed to use "commercially reasonable efforts" to relocate San Onofre fuel to an offsite storage facility, agreeing to spend up to $4 million, which will be funded by the nuclear decommissioning trust, principally for retaining experts and preparing spent nuclear fuel transportation and strategic plans applicable to a potential relocation of the fuel.

SCE Collective Bargaining Agreement

Approximately 3,900 of SCE's full-time employees are covered by collective bargaining agreements with the International Brotherhood of Electrical Workers ("IBEW"). SCE and IBEW recently negotiated, and among other things, IBEW ratified, 3% per year wage increases covering calendar years 2018 and 2019. The wage increases are effective as of October 2, 2017. The IBEW collective bargaining agreements expire on December 31, 2019.

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Preferred and Preference Stock of SCE (Notes)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Preferred and Preference Stock of SCE

Preferred and Preference Stock of SCE

During the second quarter of 2017, SCE issued $475 million of 5.00% Series L preference stock (190,004 shares; cumulative, $2,500 liquidation value) to SCE Trust VI, a special purpose entity formed to issue trust securities as discussed in Note 3. The Series L preference stock may be redeemed at a premium, in whole, but not in part, at any time prior to June 26, 2022 if certain changes in tax or investment company law or interpretation or applicable rating agency equity credit criteria occur and certain other conditions are satisfied. On or after June 26, 2022, SCE may redeem the Series L shares at par, in whole or in part. The shares are not subject to mandatory redemption. In July 2017, the proceeds were used to redeem $475 million of SCE's Series F Preference Stock.

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Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss

Edison International's accumulated other comprehensive loss, net of tax consist of:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Beginning balance	$	(48	)	$	(53	)	$	(53	)	$	(56	)
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	2			2			5			5
Other	(2		)	—			—			—
Change	—			2			5			5
Ending Balance	$	(48	)	$	(51	)	$	(48	)	$	(51	)

¹  These items are included in the computation of net periodic pension and PBOP Plan expense. See Note 8 for additional information.

SCE's accumulated other comprehensive loss, net of tax consist of:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Beginning balance	$	(18	)	$	(20	)	$	(20	)	$	(22	)
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	—			1			2			3
Change	—			1			2			3
Ending Balance	$	(18	)	$	(19	)	$	(18	)	$	(19	)

¹  These items are included in the computation of net periodic pension and PBOP Plan expense. See Note 8 for additional information.

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Interest and Other Income and Other Expenses

9 Months Ended

Sep. 30, 2017

Other Income and Expenses [Abstract]

Interest and Other Income and Other Expenses

Interest and Other Income and Other Expenses

Interest and other income and other expenses are as follows:

	Three months ended September 30,				Nine months ended September 30,
(in millions)	2017		2016		2017		2016
SCE interest and other income:
Equity allowance for funds used during construction	$	24	$	16	$	65	$	58
Increase in cash surrender value of life insurance policies and life insurance benefits	12		12		34		29
Interest income	3		1		5		4
Other	3		3		7		6
Total SCE interest and other income	42		32		111		97
Other income of Edison International Parent and Other	—		—		—		—
Total Edison International interest and other income	$	42	$	32	$	111	$	97
SCE other expenses:
Civic, political and related activities and donations	$	6	$	6	$	17	$	19
Other	3		3		11		7
Total SCE other expenses	9		9		28		26
Other expenses of Edison International Parent and Other	—		—		—		3
Total Edison International other expenses	$	9	$	9	$	28	$	29

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Supplemental Cash Flows Information

9 Months Ended

Sep. 30, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flows Information

Supplemental Cash Flows Information

Supplemental cash flows information for continuing operations is:

	Edison International				SCE
	Nine months ended September 30,
(in millions)	2017		2016		2017		2016
Cash payments for interest and taxes:
Interest, net of amounts capitalized	$	453	$	417	$	421	$	408
Tax payments, net of refunds	13		12		20		35
Non-cash financing and investing activities:
Dividends declared but not paid:
Common stock	$	177	$	156	$	191	$	—
Preferred and preference stock	1		1		1		1

SCE's accrued capital expenditures at September 30, 2017 and 2016 were $319 million and $268 million, respectively. Accrued capital expenditures will be included as an investing activity in the consolidated statements of cash flow in the period paid.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Organization and Basis of Presentation

Organization and Basis of Presentation

Edison International is the parent holding company of Southern California Edison Company ("SCE"). SCE is an investor-owned public utility primarily engaged in the business of supplying and delivering electricity to an approximately 50,000 square mile area of southern California. Edison International is also the parent company of Edison Energy Group, Inc., a holding company for subsidiaries engaged in pursuing competitive business opportunities across energy services, managed portfolio solutions, and distributed solar solutions for commercial and industrial customers. Such business activities are currently not material to report as a separate business segment. These combined notes to the consolidated financial statements apply to both Edison International and SCE unless otherwise described. Edison International's consolidated financial statements include the accounts of Edison International, SCE, and other wholly owned and controlled subsidiaries. References to Edison International refer to the consolidated group of Edison International and its subsidiaries. References to Edison International Parent and Other refer to Edison International Parent and its competitive subsidiaries. SCE's consolidated financial statements include the accounts of SCE and its wholly owned and controlled subsidiaries. All intercompany transactions have been eliminated from the consolidated financial statements.

Edison International's and SCE's significant accounting policies were described in Note 1 of "Notes to Consolidated Financial Statements" included in Edison International's and SCE's combined Annual Report on Form 10-K for the year-ended December 31, 2016 (the "2016 Form 10-K"). This quarterly report should be read in conjunction with the financial statements and notes included in the 2016 Form 10-K.

In the opinion of management, all adjustments, consisting of recurring accruals, have been made that are necessary to fairly state the consolidated financial position, results of operations, and cash flows in accordance with accounting principles generally accepted in the United States ("GAAP") for the periods covered by this quarterly report on Form 10-Q. The results of operations for the three- and nine-month periods ended September 30, 2017 are not necessarily indicative of the operating results for the full year.

The December 31, 2016 financial statement data was derived from audited financial statements, but does not include all disclosures required by GAAP.

Cash Equivalents

Cash Equivalents

Cash equivalents includes investments in money market funds. Generally, the carrying value of cash equivalents equals the fair value, as these investments have original maturities of three months or less.

Earnings Per Share

Earnings Per Share

Edison International computes earnings per common share ("EPS") using the two-class method, which is an earnings allocation formula that determines EPS for each class of common stock and participating security. Edison International's participating securities are stock-based compensation awards payable in common shares, including performance shares and restricted stock units, which earn dividend equivalents on an equal basis with common shares once the awards are vested.

New Accounting Guidance

New Accounting Guidance

Accounting Guidance Not Yet Adopted

In May 2014, the Financial Accounting Standards Board ("FASB") issued an accounting standards update on revenue recognition and further amended the standard in 2016 and 2017. Under the new standard, revenue is recognized when (or as) a good or service is transferred to the customer and the customer obtains control of the good or service. This standard will be adopted on January 1, 2018. Edison International and SCE have completed the evaluation of all significant revenue streams. Edison International and SCE do not believe the adoption of this standard will have a material impact on the financial position or results of operations. For the nine months ended September 30, 2017, approximately 95% of total operating revenue arises from SCE's tariff offerings that provide electricity to customers. For such arrangements, revenue from contracts with customers will be equivalent to the electricity supplied and billed in that period (including estimated billings). As such, there will not be a change in the timing or pattern of revenue recognition for such sales. Edison International and SCE are in the process of implementing the system and process changes necessary to comply with this standard's enhanced disclosure requirements. Edison International and SCE plan to disaggregate customer contract revenue between revenue from earnings activities and revenue from cost-recovery activities. Some revenue arrangements, such as alternative revenue programs which include balancing account over- and under-collections, are excluded from the scope of the new standard and, therefore, will be accounted for and presented separately from revenues recognized under the new standard on the Edison International and SCE consolidated financial statements. Edison International and SCE will adopt the standard by using the modified retrospective method by recognizing a cumulative effect adjustment to the opening balance of retained earnings on January 1, 2018. Edison International and SCE do not expect the cumulative effect adjustment to be material.

In January 2016, the FASB issued an accounting standards update that amends the guidance on the classification and measurement of financial instruments. The amendments require equity investments (excluding those accounted for under the equity method or those that result in consolidation) to be measured at fair value, with changes in fair value recognized in net income. It also amends certain disclosure requirements associated with the fair value of financial instruments. In addition, the new guidance requires financial assets and financial liabilities to be presented separately in the notes to the financial statements, grouped by measurement category and form of financial asset. Edison International and SCE will adopt this guidance effective January 1, 2018. SCE's nuclear decommissioning trust investments contain equity investments that are classified as available-for-sale. Due to regulatory mechanisms, the change in fair value of these investments has no impact on net income and, therefore, the adoption of this standard is not expected to have a material impact on Edison International's and SCE's consolidated financial statements.

In February 2016, the FASB issued an accounting standards update related to lease accounting including enhanced disclosures. Under the new standard, a lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified assets for a period of time in exchange for consideration. Lessees will need to recognize leases on the balance sheet as a right-of-use asset and a related lease liability, and classify the leases as either operating or finance. The liability will be equal to the present value of lease payments. The asset will be based on the liability, subject to adjustment, such as for initial direct costs. Operating leases will result in straight-line expense while finance leases will result in a higher initial expense pattern due to the interest component. SCE, as a regulated entity, is permitted to continue to have straight-line expense for finance leases, assuming the rate recovery is based upon current payments. Lessees can elect to exclude from the balance sheet short-term contracts one year or less. This guidance is effective January 1, 2019. Early adoption is permitted, but Edison International and SCE do not expect to elect early adoption. The adoption of this standard will increase right-of-use assets and lease liabilities in Edison International's and SCE's consolidated balance sheets. Edison International and SCE are currently evaluating the impact this standard will have on the results of operations and statements of cash flows and lease disclosures.

The FASB also issued an accounting standards update related to the impairment of financial instruments, effective January 1, 2020. The new guidance provides an impairment model, known as the current expected credit loss model, which is based on expected credit losses rather than incurred losses. Edison International and SCE are currently evaluating the impact of this new guidance.

The FASB also issued accounting standards updates related to the presentation and classification of certain cash receipts and payments in the statement of cash flows, including a change to the amount of cash, cash equivalents, and restricted cash explained when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. These standards are effective January 1, 2018 and require retrospective application. Restricted cash as of September 30, 2017 was $15 million at Edison International and was less than $1 million at SCE.

In January 2017, the FASB issued an accounting standards update to simplify the accounting for goodwill impairment. This accounting standards update changes the procedural steps in applying the goodwill impairment test. A goodwill impairment will now be the amount by which a reporting unit's carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. Edison International will apply this guidance to the goodwill impairment test beginning in 2020.

In March 2017, the FASB issued an accounting standards update which amends the current requirements related to the presentation of the components of net periodic benefit cost for an entity's defined benefit pension and other postretirement plans. The adoption of this standard is not expected to have a material impact on Edison International's and SCE's financial position or results of operations, but will result in the separate presentation of service costs as an operating expense and non-service costs within other income and expense and limit the capitalization of benefit costs to the service cost component. During the three and nine months ended September 30, 2017, service costs totaled $45 million and $135 million, respectively, for Edison International and $44 million and $132 million, respectively, for SCE. During the three and nine months ended September 30, 2017, non-service costs were $(14) million and $(32) million, respectively, for Edison International and $(15) million and $(45) million, respectively, for SCE. The new standards update is effective on January 1, 2018. It is required to be applied on a retrospective basis for the presentation of the service cost component and the other components of net benefit cost and on a prospective basis for the capitalization of only the service cost component of net benefit cost.

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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Cash Equivalents

The cash equivalents were as follows:

	Edison International				SCE
(in millions)	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Money market funds	$	49	$	41	$	25	$	18

Cash is temporarily invested until required for check clearing. Checks issued, but not yet paid by the financial institution, are reclassified from cash to accounts payable at the end of each reporting period as follows:

	Edison International				SCE
(in millions)	September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Book balances reclassified to accounts payable	$	85	$	138	$	85	$	136

EPS Attributable to Edison International Common Shareholders

EPS attributable to Edison International common shareholders was computed as follows:

	Three months ended September 30,				Nine months ended September 30,
(in millions, except per-share amounts)	2017		2016		2017		2016
Basic earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$	470	$	421	$	1,110	$	983
Participating securities dividends	—		—		—		—
Income from continuing operations available to common shareholders	$	470	$	421	$	1,110	$	983
Weighted average common shares outstanding	326		326		326		326
Basic earnings per share – continuing operations	$	1.44	$	1.29	$	3.41	$	3.01
Diluted earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$	470	$	421	$	1,110	$	983
Participating securities dividends	—		—		—		—
Income from continuing operations available to common shareholders	$	470	$	421	$	1,110	$	983
Income impact of assumed conversions	—		—		—		—
Income from continuing operations available to common shareholders and assumed conversions	$	470	$	421	$	1,110	$	983
Weighted average common shares outstanding	326		326		326		326
Incremental shares from assumed conversions	2		4		3		4
Adjusted weighted average shares – diluted	328		330		329		330
Diluted earnings per share – continuing operations	$	1.43	$	1.27	$	3.38	$	2.98

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Consolidated Statements of Changes in Equity (Tables)

9 Months Ended

Sep. 30, 2017

Schedule of Capitalization, Equity [Line Items]

Schedule of Changes in Equity

The following table provides Edison International's changes in equity for the nine months ended September 30, 2017:

	Equity Attributable to Common Shareholders											Noncontrolling Interests
(in millions, except per-share amounts)	Common Stock		Accumulated Other Comprehensive Loss			Retained Earnings			Subtotal			Preferred and Preference Stock			Total Equity
Balance at December 31, 2016	$	2,505	$	(53	)	$	9,544		$	11,996		$	2,191		$	14,187
Net income	—		—			1,110			1,110			94			1,204
Other comprehensive income	—		5			—			5			—			5
Common stock dividends declared ($1.6275 per share)	—		—			(530		)	(530		)	—			(530		)
Dividends to noncontrolling interests	—		—			—			—			(94		)	(94		)
Stock-based compensation	—		—			(165		)	(165		)	—			(165		)
Non-cash stock-based compensation	15		—						15			—			15
Issuance of preference stock	—		—			—			—			463			463
Redemption of preference stock	—		—			(15		)	(15		)	(460		)	(475		)
Balance at September 30, 2017	$	2,520	$	(48	)	$	9,944		$	12,416		$	2,194		$	14,610

The following table provides Edison International's changes in equity for the nine months ended September 30, 2016:

	Equity Attributable to Common Shareholders													Noncontrolling Interests
(in millions, except per-share amounts)	Common Stock			Accumulated Other Comprehensive Loss			Retained Earnings				Subtotal			Preferred and Preference Stock			Total Equity
Balance at December 31, 2015	$	2,484		$	(56	)	$	8,940			$	11,368		$	2,020		$	13,388
Net income	—			—			982			1	982			92			1,074
Other comprehensive income	—			5			—				5			—			5
Common stock dividends declared ($1.4400 per share)	—			—			(469		)		(469		)	—			(469		)
Dividends to noncontrolling interests	—			—			—				—			(92		)	(92		)
Stock-based compensation	(1		)	—			(30		)	1	(31		)	—			(31		)
Non-cash stock-based compensation	18			—			—				18			—			18
Issuance of preference stock	—			—			—				—			294			294
Redemption of preference stock	—			—			(2		)		(2		)	(123		)	(125		)
Balance at September 30, 2016	$	2,501		$	(51	)	$	9,421			$	11,871		$	2,191		$	14,062

¹   Edison International adopted an accounting standard related to share-based payments during the fourth quarter of 2016, effective January 1, 2016. See Note 1 for further information. The table above reflects the adoption of this standard on January 1, 2016. Net income and stock-based compensation (as previously reported) were $965 million and $(72) million, respectively, for the nine months ended September 30, 2016.

Southern California Edison

Schedule of Capitalization, Equity [Line Items]

Schedule of Changes in Equity

The following table provides SCE's changes in equity for the nine months ended September 30, 2017:

	Equity Attributable to Edison International
(in millions)	Common Stock		Additional Paid-in Capital			Accumulated Other Comprehensive Loss			Retained Earnings			Preferred and Preference Stock			Total Equity
Balance at December 31, 2016	$	2,168	$	657		$	(20	)	$	9,433		$	2,245		$	14,483
Net income	—		—			—			1,215			—			1,215
Other comprehensive income	—		—			2			—			—			2
Dividends declared on common stock	—		—			—			(573		)	—			(573		)
Dividends declared on preferred and preference stock	—		—			—			(94		)	—			(94		)
Stock-based compensation	—		—			—			(36		)	—			(36		)
Non-cash stock-based compensation	—		8			—			—			—			8
Issuance of preference stock	—		(12		)	—			—			475			463
Redemption of preference stock	—		15			—			(15		)	(475		)	(475		)
Balance at September 30, 2017	$	2,168	$	668		$	(18	)	$	9,930		$	2,245		$	14,993

The following table provides SCE's changes in equity for the nine months ended September 30, 2016:

	Equity Attributable to Edison International
(in millions)	Common Stock		Additional Paid-in Capital			Accumulated Other Comprehensive Loss			Retained Earnings				Preferred and Preference Stock			Total Equity
Balance at December 31, 2015	$	2,168	$	652		$	(22	)	$	8,804			$	2,070		$	13,672
Net income	—		—			—			1,140			1	—			1,140
Other comprehensive income	—		—			3			—				—			3
Dividends declared on common stock	—		—			—			(510		)		—			(510		)
Dividends declared on preferred and preference stock	—		—			—			(92		)		—			(92		)
Stock-based compensation	—		—			—			(43		)	1	—			(43		)
Non-cash stock-based compensation	—		8			—			—				—			8
Issuance of preference stock	—		(6		)	—			—				300			294
Redemption of preference stock	—		2			—			(2		)		(125		)	(125		)
Balance at September 30, 2016	$	2,168	$	656		$	(19	)	$	9,297			$	2,245		$	14,347

¹   SCE adopted an accounting standard related to share-based payments during the fourth quarter of 2016, effective January 1, 2016. See Note 1 for further information. The table above reflects the adoption of this standard on January 1, 2016. Net income and stock-based compensation (as previously reported) were $1.13 billion and $(49) million, respectively, for the nine months ended September 30, 2016.

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Variable Interest Entities (Tables)

9 Months Ended

Sep. 30, 2017

Southern California Edison

Variable Interest Entity

Summary of Trusts' Income Statements

The following table provides a summary of the trusts' income statements:

	Three months ended September 30,
(in millions)	Trust I		Trust II		Trust III		Trust IV		Trust V		Trust VI
2017
Dividend income	$	1	$	5	$	4	$	4	$	4	$	6
Dividend distributions	1		5		4		4		4		6
2016
Dividend income	$	7	$	5	$	4	$	4	$	4	*
Dividend distributions	7		5		4		4		4		*

	Nine months ended September 30,
(in millions)	Trust I		Trust II		Trust III		Trust IV		Trust V		Trust VI
2017
Dividend income	$	14	$	15	$	12	$	13	$	12	$	6
Dividend distributions	14		15		12		13		12		6
2016
Dividend income	$	20	$	15	$	12	$	13	$	9	*
Dividend distributions	20		15		12		13		9		*

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Carrying Amounts and Fair Values of Long-term Debt, Including Current Portion

The carrying value and fair value of Edison International's and SCE's long-term debt (including current portion of long-term debt) are as follows:

	September 30, 2017				December 31, 2016
(in millions)	Carrying Value1		Fair Value		Carrying Value1		Fair Value
SCE	$	11,005	$	12,554	$	10,333	$	11,539
Edison International	12,221		13,788		11,156		12,368

¹   Carrying value is net of debt issuance costs.

Southern California Edison

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair Value by Level

The following table sets forth assets and liabilities of SCE that were accounted for at fair value by level within the fair value hierarchy:

	September 30, 2017
(in millions)	Level 1		Level 2		Level 3		Netting and Collateral1		Total
Assets at fair value
Derivative contracts	$	—	$	14	$	24	$	—	$	38
Other	36		—		—		—		36
Nuclear decommissioning trusts:
Stocks2	1,655		—		—		—		1,655
Fixed Income3	1,057		1,588		—		—		2,645
Short-term investments, primarily cash equivalents	34		109		—		—		143
Subtotal of nuclear decommissioning trusts4	2,746		1,697		—		—		4,443
Total assets	2,782		1,711		24		—		4,517
Liabilities at fair value
Derivative contracts	—		1		2		—		3
Total liabilities	—		1		2		—		3
Net assets	$	2,782	$	1,710	$	22	$	—	$	4,514

	December 31, 2016
(in millions)	Level 1		Level 2		Level 3			Netting and Collateral1		Total
Assets at fair value
Derivative contracts	$	—	$	6	$	68		$	—	$	74
Other	33		—		—			—		33
Nuclear decommissioning trusts:
Stocks2	1,547		—		—			—		1,547
Fixed Income3	865		1,751		—			—		2,616
Short-term investments, primarily cash equivalents	36		170		—			—		206
Subtotal of nuclear decommissioning trusts4	2,448		1,921		—			—		4,369
Total assets	2,481		1,927		68			—		4,476
Liabilities at fair value
Derivative contracts	—		—		1,157			—		1,157
Total liabilities	—		—		1,157			—		1,157
Net assets (liabilities)	$	2,481	$	1,927	$	(1,089	)	$	—	$	3,319

¹  Represents the netting of assets and liabilities under master netting agreements and cash collateral across the levels of the fair value hierarchy. Netting among positions classified within the same level is included in that level.

²  Approximately 69% and 70% of SCE's equity investments were located in the United States at September 30, 2017 and December 31, 2016, respectively.

³  Includes corporate bonds, which were diversified and included collateralized mortgage obligations and other asset backed securities of $80 million and $79 million at September 30, 2017 and December 31, 2016, respectively.

⁴  Excludes net payables of $28 million and $127 million at September 30, 2017 and December 31, 2016, respectively, which consist of interest and dividend receivables as well as receivables and payables related to SCE's pending securities sales and purchases.

Summary of Changes in Fair Value of Level 3 Net Derivative Assets and Liabilities

The following table sets forth a summary of changes in SCE's fair value of Level 3 net derivative assets and liabilities:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Fair value of net liabilities at beginning of period	$	(1,012	)	$	(1,170	)	$	(1,089	)	$	(1,148	)
Total realized/unrealized gains (losses):
Included in regulatory assets and liabilities1	120			8			54			(14		)
Settlements	—			(1		)	—			(1		)
Contract amendment2	—			—			143			—
Normal purchase and normal sale designation3	$	914		$	—		$	914		$	—
Fair value of net assets (liabilities) at end of period	$	22		$	(1,163	)	$	22		$	(1,163	)
Change during the period in unrealized gains and losses related to assets and liabilities held at the end of the period	$	6		$	(57	)	$	6		$	(122	)

¹  Due to regulatory mechanisms, SCE's realized and unrealized gains and losses are recorded as regulatory assets and liabilities.

² Represents a tolling contract that was amended during the second quarter of 2017, which is no longer accounted for as a derivative as of September 30, 2017.

³  During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

Valuation Techniques and Significant Unobservable Inputs Used to Determine Fair Value for Level 3 Assets and Liabilities

The following table sets forth SCE's valuation techniques and significant unobservable inputs used to determine fair value for significant Level 3 assets and liabilities:

	Fair Value (in millions)					Significant	Range
	Assets		Liabilities		Valuation Technique(s)	Unobservable Input	(Weighted Average)
Congestion revenue rights
September 30, 2017	$	24	$	—	Market simulation model and auction prices	Load forecast	3,708 MW - 22,840 MW
						Power prices1	$3.65 - $99.58
						Gas prices2	$2.51 - $4.87
December 31, 2016	67		—		Market simulation model and auction prices	Load forecast	3,708 MW - 22,840 MW
						Power prices1	$3.65 - $99.58
						Gas prices2	$2.51 - $4.87
Tolling3
December 31, 2016	—		1,154		Option model	Volatility of gas prices	15% - 48% (20%)
						Volatility of power prices	29% - 71% (40%)
						Power prices	$23.40 - $51.24 ($34.70)

¹  Prices are in dollars per megawatt-hour.

²  Prices are in dollars per million British thermal units.

³ During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

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Derivative Instruments (Tables) - Southern California Edison

9 Months Ended

Sep. 30, 2017

Derivative Instruments and Hedging Activities Disclosures [Line Items]

Fair Value of Derivative Asset Instruments

The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:

	September 30, 2017
	Derivative Assets								Derivative Liabilities								Net Asset
(in millions)	Short-Term			Long-Term		Subtotal			Short-Term			Long-Term		Subtotal2
Commodity derivative contracts
Gross amounts recognized	$	37		$	2	$	39		$	4		$	—	$	4		$	35
Gross amounts offset in the consolidated balance sheets	(1		)	—		(1		)	(1		)	—		(1		)	—
Cash collateral posted1	—			—		—			—			—		—			—
Net amounts presented in the consolidated balance sheets	$	36		$	2	$	38		$	3		$	—	$	3		$	35

	December 31, 2016
	Derivative Assets								Derivative Liabilities								Net Liability
(in millions)	Short-Term			Long-Term		Subtotal			Short-Term			Long-Term		Subtotal
Commodity derivative contracts
Gross amounts recognized	$	74		$	1	$	75		$	217		$	941	$	1,158		$	1,083
Gross amounts offset in the consolidated balance sheets	(1		)	—		(1		)	(1		)	—		(1		)	—
Cash collateral posted1	—			—		—			—			—		—			—
Net amounts presented in the consolidated balance sheets	$	73		$	1	$	74		$	216		$	941	$	1,157		$	1,083

¹  In addition, at September 30, 2017 and December 31, 2016, SCE had received $1 million and $2 million, respectively, of collateral that is not offset against derivative assets and is reflected in "Other current liabilities" on the consolidated balance sheets.

²  During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

Fair Value of Derivative Liabilities Instruments

The following table summarizes the gross and net fair values of SCE's commodity derivative instruments:

	September 30, 2017
	Derivative Assets								Derivative Liabilities								Net Asset
(in millions)	Short-Term			Long-Term		Subtotal			Short-Term			Long-Term		Subtotal2
Commodity derivative contracts
Gross amounts recognized	$	37		$	2	$	39		$	4		$	—	$	4		$	35
Gross amounts offset in the consolidated balance sheets	(1		)	—		(1		)	(1		)	—		(1		)	—
Cash collateral posted1	—			—		—			—			—		—			—
Net amounts presented in the consolidated balance sheets	$	36		$	2	$	38		$	3		$	—	$	3		$	35

	December 31, 2016
	Derivative Assets								Derivative Liabilities								Net Liability
(in millions)	Short-Term			Long-Term		Subtotal			Short-Term			Long-Term		Subtotal
Commodity derivative contracts
Gross amounts recognized	$	74		$	1	$	75		$	217		$	941	$	1,158		$	1,083
Gross amounts offset in the consolidated balance sheets	(1		)	—		(1		)	(1		)	—		(1		)	—
Cash collateral posted1	—			—		—			—			—		—			—
Net amounts presented in the consolidated balance sheets	$	73		$	1	$	74		$	216		$	941	$	1,157		$	1,083

¹  In addition, at September 30, 2017 and December 31, 2016, SCE had received $1 million and $2 million, respectively, of collateral that is not offset against derivative assets and is reflected in "Other current liabilities" on the consolidated balance sheets.

²  During the third quarter of 2017, SCE designated certain derivative contracts as normal purchase and normal sale contracts, which resulted in a reclassification of $914 million from derivative liabilities to other liabilities. These liabilities will be amortized over the remaining contract terms.

Summarization of Economic Hedging Activities

The following table summarizes the components of SCE's economic hedging activity:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Realized losses	$	(3	)	$	(1	)	$	(8	)	$	(53	)
Unrealized gains (losses)	116			(2		)	37			6

Notional Volumes of Derivative Instruments

The following table summarizes the notional volumes of derivatives used for SCE hedging activities:

		Economic Hedges
Commodity	Unit of Measure	September 30, 2017	December 31, 2016
Electricity options, swaps and forwards	GWh	874	1,816
Natural gas options, swaps and forwards	Bcf	137	36
Congestion revenue rights	GWh	74,849	93,319
Tolling arrangements	GWh	—	61,093

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Reconciliation of Income Tax Expense

The table below provides a reconciliation of income tax expense computed at the federal statutory income tax rate to the income tax provision:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Edison International:
Income from continuing operations before income taxes	$	432		$	571		$	1,119		$	1,162
Provision for income tax at federal statutory rate of 35%	151			200			392			407
Increase in income tax from:
State tax, net of federal benefit	7			20			23			30
Property-related1	(201		)	(79		)	(396		)	(296		)
Change related to uncertain tax positions	—			(5		)	(17		)	(4		)
Shared-based compensation2	(4		)	(2		)	(50		)	(17		)
Other	(22		)	(14		)	(35		)	(24		)
Total income tax (benefit) expense from continuing operations	$	(69	)	$	120		$	(83	)	$	96
Effective tax rate	(16.0		)%	21.0		%	(7.4		)%	8.3		%
SCE:
Income from continuing operations before income taxes	$	462		$	607		$	1,249		$	1,291
Provision for income tax at federal statutory rate of 35%	162			212			437			452
Increase in income tax from:
State tax, net of federal benefit	12			25			34			40
Property-related1	(201		)	(79		)	(396		)	(296		)
Change related to uncertain tax positions	(1		)	(7		)	(13		)	(9		)
Shared-based compensation2	(1		)	—			(10		)	(11		)
Other	(6		)	(10		)	(18		)	(25		)
Total income tax (benefit) expense from continuing operations	$	(35	)	$	141		$	34		$	151
Effective tax rate	(7.6		)%	23.2		%	2.7		%	11.7		%

¹   Includes incremental tax benefits related to repair deductions and tax accounting method changes which are required to be flowed back to customers. During the third quarter of 2017, SCE recorded $70 million ($118 million pre-tax) of tax benefits related to tax accounting method changes resulting from the filing of SCE's 2016 tax returns. During the second quarter of 2016, SCE recorded $79 million ($133 million pre-tax) for 2012 – 2014 incremental tax benefits related to repair deductions.

²  Includes state taxes for Edison International and SCE of $10 million and $2 million, respectively, for the nine months ended September 30, 2017. Includes state taxes for Edison International and SCE of $3 million and $2 million, respectively, for the nine months ended September 30, 2016. Refer to Note 1 for further information.

Reconciliation of Unrecognized Tax Benefits

 The following table provides a reconciliation of unrecognized tax benefits for 2017 as a result of the audit settlement:

(in millions)	Edison International			SCE
Balance at January 1, 2017	$	471		$	371
Tax positions taken during the current year:
Increases	39			39
Tax positions taken during a prior year:
Increases	1			1
Decreases	(5		)	(4		)
Decreases for settlements during the period	(83		)	(78		)
Balance at September 30, 2017	$	423		$	329

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Compensation and Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Pension Plans

Defined Benefit Plan Disclosure [Line Items]

Expense Components for Plans

Net periodic pension expense components for continuing operations are:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Edison International:
Service cost	$	36		$	39		$	108		$	117
Interest cost	41			44			123			132
Expected return on plan assets	(53		)	(56		)	(159		)	(168		)
Settlement costs1	—			—			8			—
Amortization of prior service cost	—			1			2			3
Amortization of net loss2	4			9			14			27
Expense under accounting standards	$	28		$	37		$	96		$	111
Regulatory adjustment	(3		)	(9		)	(9		)	(27		)
Total expense recognized	$	25		$	28		$	87		$	84
SCE:
Service cost	$	35		$	38		$	105		$	114
Interest cost	37			41			111			123
Expected return on plan assets	(50		)	(53		)	(150		)	(159		)
Amortization of prior service cost	—			1			2			3
Amortization of net loss2	4			8			12			24
Expense under accounting standards	$	26		$	35		$	80		$	105
Regulatory adjustment	(3		)	(9		)	(9		)	(27		)
Total expense recognized	$	23		$	26		$	71		$	78

¹  Under GAAP, a settlement is recorded when lump-sum payments exceed estimated annual service and interest costs. Lump sum payments made in April 2017 to Edison International executives retiring in 2016 from the Executive Retirement Plan exceeded the estimated service and interest costs, resulting in a partial settlement of that plan. A settlement loss of approximately $7.7 million ($4.6 million after-tax) was recorded at Edison International in the second quarter of 2017.

²  Includes the amount of net loss reclassified from other comprehensive loss. The amount reclassified for Edison International and SCE was $3 million and $1 million, respectively, for the three months ended September 30, 2017, and $8 million and $4 million, respectively, for the nine months ended September 30, 2017. The amount reclassified for Edison International and SCE was $3 million and $2 million, respectively, for the three months ended September 30, 2016, and $9 million and $5 million, respectively, for the nine months ended September 30, 2016.

PBOP Plan

Defined Benefit Plan Disclosure [Line Items]

Expense Components for Plans

Net periodic PBOP expense components for continuing operations are:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Edison International:
Service cost	$	9		$	10		$	27		$	30
Interest cost	24			26			72			78
Expected return on plan assets	(27		)	(28		)	(81		)	(84		)
Amortization of prior service cost	—			(1		)	(2		)	(3		)
Total expense	$	6		$	7		$	16		$	21
SCE:
Service cost	$	9		$	10		$	27		$	30
Interest cost	24			26			72			78
Expected return on plan assets	(27		)	(28		)	(81		)	(84		)
Amortization of prior service cost	—			(1		)	(2		)	(3		)
Total expense	$	6		$	7		$	16		$	21

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Investments (Tables) - Southern California Edison

9 Months Ended

Sep. 30, 2017

Investment [Line Items]

Amortized Cost and Fair Value of the Trust Investments

The following table sets forth amortized cost and fair value of the trust investments (see Note 4 for a discussion of fair value of the trust investments):

	Longest Maturity Dates	Amortized Cost				Fair Value
(in millions)		September 30, 2017		December 31, 2016		September 30, 2017		December 31, 2016
Stocks	—	$	290	$	319	$	1,655	$	1,547
Municipal bonds	2054	612		659		738		766
U.S. government and agency securities	2067	1,220		1,131		1,298		1,191
Corporate bonds	2057	545		600		609		659
Short-term investments and receivables/payables1	One-year	111		75		115		79
Total		$	2,778	$	2,784	$	4,415	$	4,242

¹ Short-term investments include $114 million of repurchase agreements payable by financial institutions which earn interest, are fully secured by U.S. Treasury securities and mature by January 4, 2017 as of December 31, 2016. No repurchase agreements were held as of September 30, 2017.

Summary of Changes in the Fair Value of Trust

The following table sets forth a summary of changes in the fair value of the trust:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Balance at beginning of period	$	4,381		$	4,344		$	4,242		$	4,331
Gross realized gains	22			18			134			61
Gross realized losses	(3		)	(1		)	(19		)	(5		)
Unrealized gains, net of losses	65			32			179			153
Other-than-temporary impairments	(2		)	(2		)	(6		)	(10		)
Interest and dividends	28			28			87			88
Income taxes	(9		)	(5		)	(35		)	(47		)
Decommissioning disbursements	(65		)	(38		)	(164		)	(192		)
Administrative expenses and other	(2		)	—			(3		)	(3		)
Balance at end of period	$	4,415		$	4,376		$	4,415		$	4,376

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Regulatory Assets and Liabilities (Tables) - Southern California Edison

9 Months Ended

Sep. 30, 2017

Regulatory Assets [Line Items]

Regulatory Assets Included on the Consolidated Balance Sheets

SCE's regulatory assets included on the consolidated balance sheets are:

(in millions)	September 30, 2017		December 31, 2016
Current:
Regulatory balancing accounts	$	216	$	135
Energy derivatives and other power contracts	203		150
Unamortized investments, net of accumulated amortization	12		49
Other	14		16
Total current	445		350
Long-term:
Deferred income taxes, net of liabilities	5,211		4,478
Pensions and other postretirement benefits	712		710
Energy derivatives and other power contracts	839		947
Unamortized investments, net of accumulated amortization	105		80
San Onofre	730		857
Unamortized loss on reacquired debt	172		184
Regulatory balancing accounts	86		66
Environmental remediation	124		126
Other	49		7
Total long-term	8,028		7,455
Total regulatory assets	$	8,473	$	7,805

Regulatory Liabilities Included on the Consolidated Balance Sheets

SCE's regulatory liabilities included on the consolidated balance sheets are:

(in millions)	September 30, 2017		December 31, 2016
Current:
Regulatory balancing accounts	$	1,188	$	736
San Onofre MHI arbitration award1	47		—
Other	46		20
Total current	1,281		756
Long-term:
Costs of removal	2,736		2,847
Recoveries in excess of ARO liabilities2	1,719		1,639
Regulatory balancing accounts	1,344		1,180
Other	59		60
Total long-term	5,858		5,726
Total regulatory liabilities	$	7,139	$	6,482

¹ Represents SCE's net recovery from claims against MHI. See Note 11 for further discussion.

² Represents the cumulative differences between ARO expenses and amounts collected in rates primarily for the decommissioning of SCE's nuclear generation facilities. Decommissioning costs recovered through rates are primarily placed in nuclear decommissioning trusts. This regulatory liability also represents the deferral of realized and unrealized gains and losses on the nuclear decommissioning trust investments. See Note 9 for further discussion.

Schedule of Net Regulatory Balancing Accounts

The following table summarizes the significant components of regulatory balancing accounts included in the above tables of regulatory assets and liabilities:

(in millions)	September 30, 2017			December 31, 2016
Asset (liability)
Energy resource recovery account	$	190		$	(20	)
New system generation balancing account	(99		)	(6		)
Public purpose programs and energy efficiency programs	(1,178		)	(992		)
Tax accounting memorandum account and pole loading balancing account	(461		)	(142		)
Base rate recovery balancing account	(265		)	(426		)
Department of Energy litigation memorandum account	(156		)	(122		)
Greenhouse gas auction revenue	(63		)	31
FERC balancing accounts	(209		)	(69		)
Other	11			31
Liability	$	(2,230	)	$	(1,715	)

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Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Components of Accumulated Other Comprehensive Loss

Edison International's accumulated other comprehensive loss, net of tax consist of:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Beginning balance	$	(48	)	$	(53	)	$	(53	)	$	(56	)
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	2			2			5			5
Other	(2		)	—			—			—
Change	—			2			5			5
Ending Balance	$	(48	)	$	(51	)	$	(48	)	$	(51	)

¹  These items are included in the computation of net periodic pension and PBOP Plan expense. See Note 8 for additional information.

SCE's accumulated other comprehensive loss, net of tax consist of:

	Three months ended September 30,						Nine months ended September 30,
(in millions)	2017			2016			2017			2016
Beginning balance	$	(18	)	$	(20	)	$	(20	)	$	(22	)
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss1	—			1			2			3
Change	—			1			2			3
Ending Balance	$	(18	)	$	(19	)	$	(18	)	$	(19	)

¹  These items are included in the computation of net periodic pension and PBOP Plan expense. See Note 8 for additional information.

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Interest and Other Income and Other Expenses (Tables)

9 Months Ended

Sep. 30, 2017

Other Income and Expenses [Abstract]

Interest and Other Income and Expenses

Interest and other income and other expenses are as follows:

	Three months ended September 30,				Nine months ended September 30,
(in millions)	2017		2016		2017		2016
SCE interest and other income:
Equity allowance for funds used during construction	$	24	$	16	$	65	$	58
Increase in cash surrender value of life insurance policies and life insurance benefits	12		12		34		29
Interest income	3		1		5		4
Other	3		3		7		6
Total SCE interest and other income	42		32		111		97
Other income of Edison International Parent and Other	—		—		—		—
Total Edison International interest and other income	$	42	$	32	$	111	$	97
SCE other expenses:
Civic, political and related activities and donations	$	6	$	6	$	17	$	19
Other	3		3		11		7
Total SCE other expenses	9		9		28		26
Other expenses of Edison International Parent and Other	—		—		—		3
Total Edison International other expenses	$	9	$	9	$	28	$	29

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Supplemental Cash Flows Information (Tables)

9 Months Ended

Sep. 30, 2017

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flows Information

Supplemental cash flows information for continuing operations is:

	Edison International				SCE
	Nine months ended September 30,
(in millions)	2017		2016		2017		2016
Cash payments for interest and taxes:
Interest, net of amounts capitalized	$	453	$	417	$	421	$	408
Tax payments, net of refunds	13		12		20		35
Non-cash financing and investing activities:
Dividends declared but not paid:
Common stock	$	177	$	156	$	191	$	—
Preferred and preference stock	1		1		1		1

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Summary of Significant Accounting Policies (Organization and Basis of Presentation) (Details) mi² in Thousands	9 Months Ended
	Sep. 30, 2017 mi²
Southern California Edison | Electric Utility
Segment Reporting Information [Line Items]
Supply of electricity, area covered (square mile)	50

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Summary of Significant Accounting Policies (Cash Equivalents) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Restricted Cash and Cash Equivalents Items [Line Items]
Money market funds	$ 49	$ 41
Book balances reclassified to accounts payable	85	138
Southern California Edison
Restricted Cash and Cash Equivalents Items [Line Items]
Money market funds	25	18
Book balances reclassified to accounts payable	$ 85	$ 136

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Summary of Significant Accounting Policies (Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2017	Sep. 30, 2017
Accounting Policies [Abstract]
Goodwill impairment	$ 16.5
Goodwill impairment after tax	$ 10.0
Edison Energy
Goodwill [Line Items]
Goodwill		$ 78.0
SoCore Energy
Goodwill [Line Items]
Goodwill		$ 5.0

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Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$ 470	$ 421	$ 1,110	$ 983
Participating securities dividends	0	0	0	0
Income from continuing operations available to common shareholders	$ 470	$ 421	$ 1,110	$ 983
Weighted average common shares outstanding (in shares)	326,000,000	326,000,000	326,000,000	326,000,000
Basic earnings per share - continuing operations (in dollars per share)	$ 1.44	$ 1.29	$ 3.41	$ 3.01
Diluted earnings per share – continuing operations:
Income from continuing operations attributable to common shareholders	$ 470	$ 421	$ 1,110	$ 983
Participating securities dividends	0	0	0	0
Income from continuing operations available to common shareholders	470	421	1,110	983
Income impact of assumed conversions	0	0	0	0
Income from continuing operations available to common shareholders and assumed conversions	$ 470	$ 421	$ 1,110	$ 983
Weighted average common shares outstanding (in shares)	326,000,000	326,000,000	326,000,000	326,000,000
Incremental shares from assumed conversions (in shares)	2,000,000	4,000,000	3,000,000	4,000,000
Adjusted weighted average shares - diluted (in shares)	328,000,000	330,000,000	329,000,000	330,000,000
Diluted earnings per share - continuing operations (in dollars per share)	$ 1.43	$ 1.27	$ 3.38	$ 2.98
Stock option awards
Diluted earnings per share – continuing operations:
Stock-based compensation awards excluded from the computation of diluted earnings per share (in shares)	1,365,671	42,890	1,373,736	166,057

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Summary of Significant Accounting Policies (Asset Retirement Obligation) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Southern California Edison
Public Utilities, General Disclosures [Line Items]
Estimate change to ARO	$ 142

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Summary of Significant Accounting Policies (New Accounting Guidance) (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 15	$ 15
Defined Benefit Plan Disclosure [Line Items]
Service cost	45	135
Non-service costs	(14)	(32)
Southern California Edison
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	1	1
Defined Benefit Plan Disclosure [Line Items]
Service cost	44	132
Non-service costs	$ (15)	$ (45)
Southern California Edison | Sales
Concentration Risk [Line Items]
Sales from tariff offerings, percentage of total operating revenues		95.00%

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Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			$ 14,187	$ 13,388
Net income			1,204	1,074
Net income	$ 501	$ 451	1,202	1,065
Other comprehensive income (loss)	0	2	5	5
Dividends declared on common stock			(530)	(469)
Dividends to noncontrolling interests			(94)	(92)
Stock-based compensation			(165)	(31)
Non-cash stock-based compensation			15	18
Issuance of preference stock			463	294
Redemption of preference stock			(475)	(125)
Balance, at the end of the period	$ 14,610	$ 14,062	$ 14,610	$ 14,062
Dividends declared per common share (in dollars per share)	$ 0.5425	$ 0.4800	$ 1.6275	$ 1.4400
Accounting for Share-Based Payments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				$ 965
Stock-based compensation				(72)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			$ 2,505	2,484
Stock-based compensation				(1)
Non-cash stock-based compensation			15	18
Balance, at the end of the period	$ 2,520	$ 2,501	2,520	2,501
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			(53)	(56)
Other comprehensive income (loss)			5	5
Balance, at the end of the period	(48)	(51)	(48)	(51)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			9,544	8,940
Net income			1,110	982
Dividends declared on common stock			(530)	(469)
Stock-based compensation			(165)	(30)
Redemption of preference stock			(15)	(2)
Balance, at the end of the period	9,944	9,421	9,944	9,421
Subtotal
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			11,996	11,368
Net income			1,110	982
Other comprehensive income (loss)			5	5
Dividends declared on common stock			(530)	(469)
Stock-based compensation			(165)	(31)
Non-cash stock-based compensation			15	18
Redemption of preference stock			(15)	(2)
Balance, at the end of the period	12,416	11,871	12,416	11,871
Preferred and Preference Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,191	2,020
Net income			94	92
Dividends to noncontrolling interests			(94)	(92)
Issuance of preference stock			463	294
Redemption of preference stock			(460)	(123)
Balance, at the end of the period	2,194	2,191	2,194	2,191
Southern California Edison
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			14,483	13,672
Net income	497	466	1,215	1,140
Other comprehensive income (loss)	0	1	2	3
Dividends declared on common stock			(573)	(510)
Dividends declared on preferred and preference stock			(94)	(92)
Stock-based compensation			(36)	(43)
Non-cash stock-based compensation			8	8
Issuance of preference stock			463	294
Redemption of preference stock			(475)	(125)
Balance, at the end of the period	14,993	14,347	14,993	14,347
Southern California Edison | Accounting for Share-Based Payments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income				1,130
Stock-based compensation				(49)
Southern California Edison | Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,168	2,168
Balance, at the end of the period	2,168	2,168	2,168	2,168
Southern California Edison | Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			657	652
Non-cash stock-based compensation			8	8
Issuance of preference stock			(12)	(6)
Redemption of preference stock			15	2
Balance, at the end of the period	668	656	668	656
Southern California Edison | Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			(20)	(22)
Other comprehensive income (loss)			2	3
Balance, at the end of the period	(18)	(19)	(18)	(19)
Southern California Edison | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			9,433	8,804
Net income			1,215	1,140
Dividends declared on common stock			(573)	(510)
Dividends declared on preferred and preference stock			(94)	(92)
Stock-based compensation			(36)	(43)
Redemption of preference stock			(15)	(2)
Balance, at the end of the period	9,930	9,297	9,930	9,297
Southern California Edison | Preferred and Preference Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,245	2,070
Issuance of preference stock			475	300
Redemption of preference stock			(475)	(125)
Balance, at the end of the period	$ 2,245	$ 2,245	$ 2,245	$ 2,245

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Variable Interest Entities (Textual) (Details)		1 Months Ended	3 Months Ended			9 Months Ended
	Jul. 27, 2017 USD ($)	Jul. 27, 2017 USD ($)	Sep. 30, 2017 USD ($) $ / shares MW	Jun. 30, 2017 USD ($) $ / shares	Sep. 30, 2016 USD ($) MW	Sep. 30, 2017 USD ($) $ / shares MW	Sep. 30, 2016 USD ($) MW
Variable Interest Entity
Redemption of trust securities						$ 475,000,000	$ 125,000,000
Southern California Edison
Variable Interest Entity
Redemption of trust securities						$ 475,000,000	$ 125,000,000
Southern California Edison | Series F Preferred Stock
Variable Interest Entity
Redemption of trust securities	$ 475,000,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | SCE Power Purchase Contracts
Variable Interest Entity
Power generating capacity (in megawatts) | MW			4,858		4,349	4,858	4,349
Payments to unconsolidated VIEs for power purchase contracts			$ 325,000,000		$ 313,000,000	$ 571,000,000	$ 532,000,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust I
Variable Interest Entity
Common stock			10,000			$ 10,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust I | Trust Securities
Variable Interest Entity
Security dividend rate						5.625%
Liquidation preference			$ 475,000,000			$ 475,000,000
Liquidation value (in dollars per share) | $ / shares			$ 25			$ 25
Common stock			$ 10,000			$ 10,000
Redemption of trust securities		$ 10,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust I | Series F Preferred Stock
Variable Interest Entity
Security dividend rate						5.625%
Liquidation preference			$ 475,000,000			$ 475,000,000
Liquidation value (in dollars per share) | $ / shares			$ 2,500			$ 2,500
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust II
Variable Interest Entity
Common stock			$ 10,000			$ 10,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust II | Trust Securities
Variable Interest Entity
Security dividend rate						5.10%
Liquidation preference			$ 400,000,000			$ 400,000,000
Liquidation value (in dollars per share) | $ / shares			$ 25			$ 25
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust II | Series G Preferred Stock
Variable Interest Entity
Security dividend rate						5.10%
Liquidation preference			$ 400,000,000			$ 400,000,000
Liquidation value (in dollars per share) | $ / shares			$ 2,500			$ 2,500
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust III
Variable Interest Entity
Common stock			$ 10,000			$ 10,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust III | Trust Securities
Variable Interest Entity
Security dividend rate						5.75%
Liquidation preference			$ 275,000,000			$ 275,000,000
Liquidation value (in dollars per share) | $ / shares			$ 25			$ 25
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust III | Series H Preferred Stock
Variable Interest Entity
Security dividend rate						5.75%
Liquidation preference			$ 275,000,000			$ 275,000,000
Liquidation value (in dollars per share) | $ / shares			$ 2,500			$ 2,500
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust IV
Variable Interest Entity
Common stock			$ 10,000			$ 10,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust IV | Trust Securities
Variable Interest Entity
Security dividend rate						5.375%
Liquidation preference			$ 325,000,000			$ 325,000,000
Liquidation value (in dollars per share) | $ / shares			$ 25			$ 25
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust IV | Series J Preferred Stock
Variable Interest Entity
Security dividend rate						5.375%
Liquidation preference			$ 325,000,000			$ 325,000,000
Liquidation value (in dollars per share) | $ / shares			$ 2,500			$ 2,500
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust V
Variable Interest Entity
Common stock			$ 10,000			$ 10,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust V | Trust Securities
Variable Interest Entity
Security dividend rate						5.45%
Liquidation preference			$ 300,000,000			$ 300,000,000
Liquidation value (in dollars per share) | $ / shares			$ 25			$ 25
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust V | Series K Preferred Stock
Variable Interest Entity
Security dividend rate						5.45%
Liquidation preference			$ 300,000,000			$ 300,000,000
Liquidation value (in dollars per share) | $ / shares			$ 2,500			$ 2,500
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust VI
Variable Interest Entity
Common stock			$ 10,000			$ 10,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust VI | Trust Securities
Variable Interest Entity
Security dividend rate						5.00%
Liquidation preference			$ 475,000,000			$ 475,000,000
Liquidation value (in dollars per share) | $ / shares			$ 25			$ 25
Redemption of trust securities		$ 475,000,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust VI | Series K Preferred Stock
Variable Interest Entity
Liquidation preference			$ 475,000,000			$ 475,000,000
Southern California Edison | Variable Interest Entity, Not Primary Beneficiary | Trust VI | Series L Preferred Stock
Variable Interest Entity
Security dividend rate				5.00%		5.00%
Liquidation preference			$ 475,000,000	$ 475,000,000		$ 475,000,000
Liquidation value (in dollars per share) | $ / shares			$ 2,500	$ 2,500		$ 2,500

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Variable Interest Entities (Summary of Trusts' Income Statement) (Details) - Variable Interest Entity, Not Primary Beneficiary - Southern California Edison - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Trust I
Variable Interest Entity
Dividend income	$ 1	$ 7	$ 14	$ 20
Dividend distributions	1	7	14	20
Trust II
Variable Interest Entity
Dividend income	5	5	15	15
Dividend distributions	5	5	15	15
Trust III
Variable Interest Entity
Dividend income	4	4	12	12
Dividend distributions	4	4	12	12
Trust IV
Variable Interest Entity
Dividend income	4	4	13	13
Dividend distributions	4	4	13	13
Trust V
Variable Interest Entity
Dividend income	4	4	12	9
Dividend distributions	4	$ 4	12	$ 9
Trust VI
Variable Interest Entity
Dividend income	6		6
Dividend distributions	$ 6		$ 6

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Fair Value Measurements (Fair Value by Level) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Assets at fair value
Nuclear decommissioning trusts	$ 4,415		$ 4,242
Southern California Edison
Assets at fair value
Nuclear decommissioning trusts	$ 4,415	$ 4,381	$ 4,242	$ 4,376	$ 4,344	$ 4,331
Liabilities at fair value
Percentage of equity investments located in the United States	69.00%		70.00%
Collateralized mortgage obligations and other asset backed securities	$ 80		$ 79
Payables, net, related to investments	28		127
Southern California Edison | Fair Value, Measurements, Recurring
Assets at fair value
Derivative contracts	38		74
Other	36		33
Nuclear decommissioning trusts	4,443		4,369
Total assets	4,517		4,476
Liabilities at fair value
Derivative contracts	3		1,157
Netting and Collateral	0		0
Total liabilities	3		1,157
Net assets	4,514		3,319
Southern California Edison | Fair Value, Measurements, Recurring | Stocks
Assets at fair value
Nuclear decommissioning trusts	1,655		1,547
Southern California Edison | Fair Value, Measurements, Recurring | Fixed income
Assets at fair value
Nuclear decommissioning trusts	2,645		2,616
Southern California Edison | Fair Value, Measurements, Recurring | Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	143		206
Southern California Edison | Fair Value, Measurements, Recurring | Level 1
Assets at fair value
Derivative contracts	0		0
Other	36		33
Nuclear decommissioning trusts	2,746		2,448
Total assets	2,782		2,481
Liabilities at fair value
Derivative contracts	0		0
Total liabilities	0		0
Net assets	2,782		2,481
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Stocks
Assets at fair value
Nuclear decommissioning trusts	1,655		1,547
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Fixed income
Assets at fair value
Nuclear decommissioning trusts	1,057		865
Southern California Edison | Fair Value, Measurements, Recurring | Level 1 | Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	34		36
Southern California Edison | Fair Value, Measurements, Recurring | Level 2
Assets at fair value
Derivative contracts	14		6
Other	0		0
Nuclear decommissioning trusts	1,697		1,921
Total assets	1,711		1,927
Liabilities at fair value
Derivative contracts	1		0
Total liabilities	1		0
Net assets	1,710		1,927
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Stocks
Assets at fair value
Nuclear decommissioning trusts	0		0
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Fixed income
Assets at fair value
Nuclear decommissioning trusts	1,588		1,751
Southern California Edison | Fair Value, Measurements, Recurring | Level 2 | Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	109		170
Southern California Edison | Fair Value, Measurements, Recurring | Level 3
Assets at fair value
Derivative contracts	24		68
Other	0		0
Nuclear decommissioning trusts	0		0
Total assets	24		68
Liabilities at fair value
Derivative contracts	2		1,157
Total liabilities	2		1,157
Net assets	22		(1,089)
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 | Stocks
Assets at fair value
Nuclear decommissioning trusts	0		0
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 | Fixed income
Assets at fair value
Nuclear decommissioning trusts	0		0
Southern California Edison | Fair Value, Measurements, Recurring | Level 3 | Short-term investments, primarily cash equivalents
Assets at fair value
Nuclear decommissioning trusts	$ 0		$ 0

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Fair Value Measurements (Textual) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 49	$ 41
Edison International Parent and Other | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 24	$ 23

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Fair Value Measurements (Level 3 Rollforward) (Details) - Southern California Edison - Level 3 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Liabilities	$ 914		$ 914
Fair Value Disclosures Level 3 [Roll Forward]
Fair value of net liabilities at beginning of period	(1,012)	$ (1,170)	(1,089)	$ (1,148)
Total realized/unrealized gains (losses):
Included in regulatory assets and liabilities	120	8	54	(14)
Settlements	0	(1)	0	(1)
Contract amendment	0	0	143	0
Normal purchase and normal sale designation	914	0	914	0
Fair value of net assets (liabilities) at end of period	22	(1,163)	22	(1,163)
Change during the period in unrealized losses related to assets and liabilities held at the end of the period	6	$ (57)	$ 6	$ (122)
Derivative contracts reclassified to other assets	$ 914

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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements) (Details) - Southern California Edison - Level 3 $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) $ / MWh $ / MMBTU MW	Dec. 31, 2016 USD ($) $ / MWh $ / MMBTU MW
Congestion revenue rights | Market simulation model and auction prices
Quantitative Information About Level 3 Measurements [Line Items]
Fair Value, Assets | $	$ 24	$ 67
Fair Value, Liabilities | $	$ 0	$ 0
Congestion revenue rights | Market simulation model and auction prices | Load forecast | Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, power units (in megawatts) | MW	3,708	3,708
Congestion revenue rights | Market simulation model and auction prices | Load forecast | Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, power units (in megawatts) | MW	22,840	22,840
Congestion revenue rights | Market simulation model and auction prices | Power prices | Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)	3.65	3.65
Congestion revenue rights | Market simulation model and auction prices | Power prices | Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)	99.58	99.58
Congestion revenue rights | Market simulation model and auction prices | Gas prices | Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh) | $ / MMBTU	2.51	2.51
Congestion revenue rights | Market simulation model and auction prices | Gas prices | Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh) | $ / MMBTU	4.87	4.87
Tolling | Option model
Quantitative Information About Level 3 Measurements [Line Items]
Fair Value, Assets | $		$ 0
Fair Value, Liabilities | $		$ 1,154
Tolling | Option model | Power prices | Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)		23.40
Expected volatility rate		29.00%
Tolling | Option model | Power prices | Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)		51.24
Expected volatility rate		71.00%
Tolling | Option model | Power prices | Weighted Average
Quantitative Information About Level 3 Measurements [Line Items]
Fair value inputs, price level ($ per MWh)		34.70
Expected volatility rate		40.00%
Tolling | Option model | Gas prices | Minimum
Quantitative Information About Level 3 Measurements [Line Items]
Expected volatility rate		15.00%
Tolling | Option model | Gas prices | Maximum
Quantitative Information About Level 3 Measurements [Line Items]
Expected volatility rate		48.00%
Tolling | Option model | Gas prices | Weighted Average
Quantitative Information About Level 3 Measurements [Line Items]
Expected volatility rate		20.00%

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Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Fair Value of Long-Term Debt Recorded at Carrying Value [Line Items]
Carrying Value	$ 12,221	$ 11,156
Fair Value	13,788	12,368
Southern California Edison
Fair Value of Long-Term Debt Recorded at Carrying Value [Line Items]
Carrying Value	11,005	10,333
Fair Value	$ 12,554	$ 11,539

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Debt and Credit Agreements (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Aug. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Non-recourse debt			$ 12,221,000,000		$ 11,156,000,000
Short-term debt			908,000,000		1,307,000,000
Multi-year revolving credit facility
Debt Instrument [Line Items]
Commitment			1,250,000,000.00
Short-term debt			$ 573,000,000		$ 538,000,000
Weighted average interest rate			1.37%		0.97%
Southern California Edison
Debt Instrument [Line Items]
Non-recourse debt			$ 11,005,000,000		$ 10,333,000,000
Short-term debt			329,000,000		$ 769,000,000
Southern California Edison | First and refunding mortgage bonds
Debt Instrument [Line Items]
Debt			1,000,000,000
Southern California Edison | Term Loan Agreement
Debt Instrument [Line Items]
Debt		$ 300,000,000
London Interbank Offered Rate		65.00%
Southern California Edison | Pollution-control bonds
Debt Instrument [Line Items]
Debt		$ 135,000,000
Stated interest rate		2.625%
Southern California Edison | 4.00% First and refunding mortgage bonds due 2047 | First and refunding mortgage bonds
Debt Instrument [Line Items]
Debt		$ 700,000,000
Stated interest rate		4.00%
Southern California Edison | Reissued 4.00% first and refunding mortgage bonds due 2047 | First and refunding mortgage bonds
Debt Instrument [Line Items]
Debt			300,000,000
Southern California Edison | 2.125% Senior notes due 2020 | Senior notes
Debt Instrument [Line Items]
Debt		$ 400,000,000
Stated interest rate		2.125%
Southern California Edison | 2.40% Senior notes due 2022 | Senior notes
Debt Instrument [Line Items]
Debt				$ 400,000,000
Stated interest rate				2.40%
Southern California Edison | 3.75% Senior notes | Senior notes
Debt Instrument [Line Items]
Debt			$ 400,000,000
Stated interest rate			3.75%
Southern California Edison | Multi-year revolving credit facility
Debt Instrument [Line Items]
Commitment			$ 2,750,000,000.00
Southern California Edison | Multi-year revolving credit facility | Commercial paper
Debt Instrument [Line Items]
Weighted average interest rate					0.90%
Outstanding borrowings					$ 769,000,000
Southern California Edison | Multi-year revolving credit facility | Letters of credit
Debt Instrument [Line Items]
Outstanding letters of credit			$ 267,000,000
Letters of credit expiration period			12 months
Southern California Edison | Multi-year revolving credit facility | Commercial paper
Debt Instrument [Line Items]
Short-term debt			$ 329,000,000
Weighted average interest rate			1.29%
Indirect subsidiaries | Nonrecourse Ground Mount Solar Project, Equity Investment Financing [Member] | Subsequent event
Debt Instrument [Line Items]
Non-recourse debt	$ 100,000,000
Initial allocation of taxable losses and tax credits	99.00%
Allocation of taxable income and losses after initial period	67.00%
Allocation of cash flow	15.60%
Term of agreement	20 years

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Derivative Instruments (Textual) (Details) - Southern California Edison - Electric Utility - Economic Hedges - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features	$ 2	$ 12
Posted collateral	15	$ 12
Potential amount of collateral to be posted if contingencies triggered	15
Payables
Derivative [Line Items]
Potential amount of collateral to be posted if contingencies triggered	$ 13

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Derivative Instruments (Balance Sheet Disclosures) (Details) - Southern California Edison Company - Commodity derivative contracts - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Other current liabilities
Net Asset
Collateral received	$ 1	$ 2
Electric Utility
Derivative Assets
Gross amounts recognized	39	75
Gross amounts offset in the consolidated balance sheets	(1)	(1)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	38	74
Derivative Liabilities
Gross amounts recognized	4	1,158
Gross amounts offset in the consolidated balance sheets	(1)	(1)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	3	1,157
Net Asset
Gross amounts recognized	35	1,083
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	35	1,083
Electric Utility | Derivative Assets, Short-Term
Derivative Assets
Gross amounts recognized	37	74
Gross amounts offset in the consolidated balance sheets	(1)	(1)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	36	73
Electric Utility | Derivative Assets, Long-Term
Derivative Assets
Gross amounts recognized	2	1
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	2	1
Electric Utility | Derivative Liability, Short-Term
Derivative Liabilities
Gross amounts recognized	4	217
Gross amounts offset in the consolidated balance sheets	(1)	(1)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	3	216
Electric Utility | Derivative Liability, Long-Term
Derivative Liabilities
Gross amounts recognized	0	941
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	0	$ 941
Electric Utility | Derivative liabilities
Derivative Liabilities
Gross amounts recognized	$ (1,000)

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Derivative Instruments (Summarization of Economic Hedging Activities) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Realized losses	$ (3)	$ (1)	$ (8)	$ (53)
Unrealized gains (losses)	$ 116	$ (2)	$ 37	$ 6

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Derivative Instruments (Notional Values) (Details) - Southern California Edison - Electric Utility - Economic Hedges GWh in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017 GWh Bcfe	Dec. 31, 2016 GWh Bcfe
Electricity options, swaps and forwards (GWh)
Derivative [Line Items]
Notional volumes of derivative instruments	874	1,816
Natural gas options, swaps and forwards (Bcf)
Derivative [Line Items]
Notional volumes of derivative instruments | Bcfe	137	36
Congestion revenue rights (GWh)
Derivative [Line Items]
Notional volumes of derivative instruments	74,849	93,319
Tolling arrangements (GWh)
Derivative [Line Items]
Notional volumes of derivative instruments	0	61,093

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Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	$ 432	$ 571			$ 1,119	$ 1,162
Provision for income tax at federal statutory rate of 35%	151	200			392	407
Increase in income tax from:
State tax, net of federal benefit	7	20			23	30
Property-related	(201)	(79)			(396)	(296)
Change related to uncertain tax positions	0	(5)			(17)	(4)
Shared-based compensation	(4)	(2)			(50)	(17)
Other	(22)	(14)			(35)	(24)
Total income tax (benefit) expense from continuing operations	$ (69)	$ 120			$ (83)	$ 96
Effective tax rate	(16.00%)	21.00%			(7.40%)	8.30%
Federal statutory rate	35.00%	35.00%			35.00%	35.00%
State
Increase in income tax from:
Shared-based compensation					$ 10	$ 3
Southern California Edison
Income Tax Disclosures [Line Items]
Income from continuing operations before income taxes	$ 462	$ 607			1,249	1,291
Provision for income tax at federal statutory rate of 35%	162	212			437	452
Increase in income tax from:
State tax, net of federal benefit	12	25			34	40
Property-related	(201)	(79)			(396)	(296)
Change related to uncertain tax positions	(1)	(7)			(13)	(9)
Shared-based compensation	(1)	0			(10)	(11)
Other	(6)	(10)			(18)	(25)
Total income tax (benefit) expense from continuing operations	$ (35)	$ 141			$ 34	$ 151
Effective tax rate	(7.60%)	23.20%			2.70%	11.70%
Federal statutory rate	35.00%	35.00%			35.00%	35.00%
Tax abandonment loss				$ 39
Southern California Edison | State
Increase in income tax from:
Shared-based compensation					$ 2	$ 2
Tax abandonment loss				1,130
Southern California Edison | Federal
Increase in income tax from:
Tax abandonment loss				$ 691
Southern California Edison | Tax accounting method changes | IRS
Increase in income tax from:
Incremental tax benefits related to repair deductions	$ 70
Incremental tax benefits related to repair deductions, before tax	$ 118
Southern California Edison | Tax years 2012 to 2014 | IRS
Increase in income tax from:
Incremental tax benefits related to repair deductions			$ 79
Incremental tax benefits related to repair deductions, before tax			$ 133

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Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1, 2017	$ 471
Tax positions taken during the current year, Increases	39
Tax positions taken during a prior year, Increases	1
Tax positions taken during a prior year, Decreases	(5)
Tax positions taken during a prior year, Decreases for settlements during the period	(83)
Balance at September 30, 2017	423
Southern California Edison
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1, 2017	371
Tax positions taken during the current year, Increases	39
Tax positions taken during a prior year, Increases	1
Tax positions taken during a prior year, Decreases	(4)
Tax positions taken during a prior year, Decreases for settlements during the period	(78)
Balance at September 30, 2017	$ 329

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Income Taxes (Tax Disputes) (Details) $ in Millions	Mar. 31, 2017 USD ($)
Tax Years 2007 - 2012
Income Tax Examination [Line Items]
IRS refund expected	$ 7

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Compensation and Benefit Plans (Textual) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 100
Estimated future contributions in remainder of year	15
PBOP Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	16
Estimated future contributions in remainder of year	5
Southern California Edison | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	64
Estimated future contributions in remainder of year	$ 1

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Compensation and Benefit Plans (Expense Components) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 45.0			$ 135.0
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	36.0		$ 39.0	108.0	$ 117.0
Interest cost	41.0		44.0	123.0	132.0
Expected return on plan assets	(53.0)		(56.0)	(159.0)	(168.0)
Settlement costs	0.0		0.0	8.0	0.0
Amortization of prior service cost	0.0		1.0	2.0	3.0
Amortization of net loss	4.0		9.0	14.0	27.0
Expense under accounting standards	28.0		37.0	96.0	111.0
Regulatory adjustment	(3.0)		(9.0)	(9.0)	(27.0)
Total expense recognized	25.0		28.0	87.0	84.0
Settlement loss		$ 7.7
Settlement loss, net of tax		$ 4.6
Net loss reclassified	3.0		3.0	8.0	9.0
PBOP Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9.0		10.0	27.0	30.0
Interest cost	24.0		26.0	72.0	78.0
Expected return on plan assets	(27.0)		(28.0)	(81.0)	(84.0)
Amortization of prior service cost	0.0		(1.0)	(2.0)	(3.0)
Expense under accounting standards	6.0		7.0	16.0	21.0
Southern California Edison
Defined Benefit Plan Disclosure [Line Items]
Service cost	44.0			132.0
Southern California Edison | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	35.0		38.0	105.0	114.0
Interest cost	37.0		41.0	111.0	123.0
Expected return on plan assets	(50.0)		(53.0)	(150.0)	(159.0)
Amortization of prior service cost	0.0		1.0	2.0	3.0
Amortization of net loss	4.0		8.0	12.0	24.0
Expense under accounting standards	26.0		35.0	80.0	105.0
Regulatory adjustment	(3.0)		(9.0)	(9.0)	(27.0)
Total expense recognized	23.0		26.0	71.0	78.0
Net loss reclassified	1.0		2.0	4.0	5.0
Southern California Edison | PBOP Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9.0		10.0	27.0	30.0
Interest cost	24.0		26.0	72.0	78.0
Expected return on plan assets	(27.0)		(28.0)	(81.0)	(84.0)
Amortization of prior service cost	0.0		(1.0)	(2.0)	(3.0)
Expense under accounting standards	$ 6.0		$ 7.0	$ 16.0	$ 21.0

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Investments (Amortized Cost and Fair Value of Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	$ 2,778	$ 2,784
Fair Value	4,415	4,242
Stocks
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	290	319
Fair Value	1,655	1,547
Municipal bonds
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	612	659
Fair Value	738	766
U.S. government and agency securities
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	1,220	1,131
Fair Value	1,298	1,191
Corporate bonds
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	545	600
Fair Value	609	659
Short-term investments and receivables/payables
Nuclear Decommissioning Trusts Disclosures
Amortized Cost	111	75
Fair Value	$ 115	79
Repurchase agreement		$ 114

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Investments (Nuclear Decommissioning Trusts) (Details) - Southern California Edison - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Other Investments [Line Items]
Unrealized holding gains, net of losses	$ 1,600	$ 1,500
Deferred income taxes related to unrealized gains	402
Nuclear decommissioning trusts	$ 4,000

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Investments (Summary of Changes in Fair Value of the Nuclear Decommissioning Trusts) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Summary Of Changes In The Fair Value [Roll Forward]
Balance at beginning of period			$ 4,242
Balance at end of period	$ 4,415		4,415
Southern California Edison
Summary Of Changes In The Fair Value [Roll Forward]
Balance at beginning of period	4,381	$ 4,344	4,242	$ 4,331
Gross realized gains	22	18	134	61
Gross realized losses	(3)	(1)	(19)	(5)
Unrealized gains, net of losses	65	32	179	153
Other-than-temporary impairments	(2)	(2)	(6)	(10)
Interest and dividends	28	28	87	88
Income taxes	(9)	(5)	(35)	(47)
Decommissioning disbursements	(65)	(38)	(164)	(192)
Administrative expenses and other	(2)	0	(3)	(3)
Balance at end of period	$ 4,415	$ 4,376	$ 4,415	$ 4,376

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Regulatory Assets and Liabilities (Schedule of Regulatory Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Regulatory Assets [Line Items]
Current regulatory assets	$ 445	$ 350
Long-term regulatory assets	8,028	7,455
Environmental remediation
Regulatory Assets [Line Items]
Long-term regulatory assets	124	126
Southern California Edison
Regulatory Assets [Line Items]
Current regulatory assets	445	350
Long-term regulatory assets	8,028	7,455
Total regulatory assets	8,473	7,805
Southern California Edison | Regulatory balancing accounts
Regulatory Assets [Line Items]
Current regulatory assets	216	135
Long-term regulatory assets	86	66
Southern California Edison | Energy derivatives and other power contracts
Regulatory Assets [Line Items]
Current regulatory assets	203	150
Long-term regulatory assets	839	947
Southern California Edison | Unamortized investments, net of accumulated amortization
Regulatory Assets [Line Items]
Current regulatory assets	12	49
Southern California Edison | Other
Regulatory Assets [Line Items]
Current regulatory assets	14	16
Long-term regulatory assets	49	7
Southern California Edison | Deferred income taxes, net of liabilities
Regulatory Assets [Line Items]
Long-term regulatory assets	5,211	4,478
Southern California Edison | Pensions and other postretirement benefits
Regulatory Assets [Line Items]
Long-term regulatory assets	712	710
Southern California Edison | Unamortized investments, net of accumulated amortization
Regulatory Assets [Line Items]
Long-term regulatory assets	105	80
Southern California Edison | San Onofre
Regulatory Assets [Line Items]
Long-term regulatory assets	730	857
Southern California Edison | Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Long-term regulatory assets	$ 172	$ 184

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Regulatory Assets and Liabilities (Schedule of Regulatory Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 1,281	$ 756
Long-term regulatory liabilities	5,858	5,726
Southern California Edison
Regulatory Liabilities [Line Items]
Current regulatory liabilities	1,281	756
Long-term regulatory liabilities	5,858	5,726
Total regulatory liabilities	7,139	6,482
Southern California Edison | Regulatory balancing accounts
Regulatory Liabilities [Line Items]
Current regulatory liabilities	1,188	736
Long-term regulatory liabilities	1,344	1,180
Southern California Edison | San Onofre MHI arbitration award
Regulatory Liabilities [Line Items]
Current regulatory liabilities	47	0
Southern California Edison | Other
Regulatory Liabilities [Line Items]
Current regulatory liabilities	46	20
Long-term regulatory liabilities	59	60
Southern California Edison | Costs of removal
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	2,736	2,847
Southern California Edison | Recoveries in excess of ARO liabilities
Regulatory Liabilities [Line Items]
Long-term regulatory liabilities	$ 1,719	$ 1,639

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Regulatory Assets and Liabilities (Schedule of Net Regulatory Balancing Accounts) (Details) - Southern California Edison - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
IRS | Tax accounting method changes
Regulatory Assets and Liabilities
Incremental tax benefits related to repair deductions, before tax	$ 118
Regulatory balancing accounts | Energy resource recovery account
Regulatory Assets and Liabilities
Asset (liability)	190	$ (20)
Regulatory balancing accounts | New system generation balancing account
Regulatory Assets and Liabilities
Asset (liability)	(99)	(6)
Refunds of excess revenue | Net regulatory balancing accounts
Regulatory Assets and Liabilities
Asset (liability)	(2,230)	(1,715)
Refunds of excess revenue | Public purpose programs and energy efficiency programs
Regulatory Assets and Liabilities
Asset (liability)	(1,178)	(992)
Refunds of excess revenue | Tax accounting memorandum account and pole loading balancing account
Regulatory Assets and Liabilities
Asset (liability)	(461)	(142)
Refunds of excess revenue | Base rate recovery balancing account
Regulatory Assets and Liabilities
Asset (liability)	(265)	(426)
Refunds of excess revenue | Department of Energy litigation memorandum account
Regulatory Assets and Liabilities
Asset (liability)	(156)	(122)
Refunds of excess revenue | Greenhouse gas auction revenue
Regulatory Assets and Liabilities
Asset (liability)	(63)	31
Refunds of excess revenue | FERC balancing accounts
Regulatory Assets and Liabilities
Asset (liability)	(209)	(69)
Refunds of excess revenue | Other
Regulatory Assets and Liabilities
Asset (liability)	$ 11	$ 31

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Commitments and Contingencies (Third-Party Power Purchase Agreements) (Details) - Southern California Edison - Commitments meeting critical contract provisions $ in Millions	Sep. 30, 2017 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Estimated commitments in two years	$ 27
Estimated commitments in three years	72
Estimated commitments in four years	62
Estimated commitments in five years	20
Estimated commitments after five years	$ 1,200

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Commitments and Contingencies (Contingencies) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Regulatory Assets [Line Items]
Regulatory assets	$ 8,028	$ 7,455
Southern California Edison
Regulatory Assets [Line Items]
Regulatory assets	8,028	7,455
Southern California Edison | San Onofre
Regulatory Assets [Line Items]
Regulatory assets	$ 730	$ 857

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Commitments and Contingencies (MHI Claims) (Details) - USD ($)	1 Months Ended
	Mar. 31, 2017	Apr. 30, 2016	Oct. 31, 2013	Jun. 30, 2010
Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Damages sought				$ 112,000,000
Initial recovery rewarded		$ 124,000,000
San Onofre | Southern California Edison | Mitsubishi Heavy Industries Ltd
Schedule Of Commitments And Contingencies [Line Items]
Initial recovery rewarded	$ 52,000,000
Net recovery	$ 47,000,000
San Onofre | Southern California Edison | Mitsubishi Heavy Industries Ltd | Minimum
Schedule Of Commitments And Contingencies [Line Items]
Damages sought			$ 4,000,000,000
San Onofre | Mitsubishi Heavy Industries Ltd
Schedule Of Commitments And Contingencies [Line Items]
Asserted counterclaim			$ 41,000,000

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Commitments and Contingencies (Environmental Remediation) (Details) - Southern California Edison	9 Months Ended
	Sep. 30, 2017 USD ($) site	Sep. 30, 2016 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Identified material sites for environmental remediation (in number of sites) | site	19
Minimum costs to be identified site	$ 1,000,000
Minimum liability for environmental remediation for material sites	$ 125,000,000
Immaterial sites for environmental remediation (in number of sites) | site	17
Environmental remediation liability	$ 129,000,000
Regulatory assets related to environmental remediation	123,000,000
Portion of recorded liability recoverable from incentive mechanism	$ 46,000,000
Percentage of environmental remediation costs recoverable through an incentive mechanism (as a percent)	90.00%
Liability incurred at majority of the remaining sites through customer rates	$ 77,000,000
Environmental remediation costs to be recovered (as a percent)	100.00%
Amount that cleanup costs could exceed recorded liability for identified material sites	$ 151,000,000
Amount that cleanup costs could exceed recorded liability for immaterial sites	$ 8,000,000
Remediation cost estimates (period)	5 years
Environmental remediation costs	$ 6,000,000	$ 3,000,000
Minimum
Schedule Of Commitments And Contingencies [Line Items]
Minimum liability for environmental remediation for immaterial sites	4,000,000
Expected annual environmental remediation costs	$ 5,000,000
Maximum
Schedule Of Commitments And Contingencies [Line Items]
Maximum expected period for cleanup of identified sites (in years)	30 years
Expected annual environmental remediation costs	$ 17,000,000
San Onofre
Schedule Of Commitments And Contingencies [Line Items]
Minimum liability for environmental remediation for material sites	$ 74,000,000

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Commitments and Contingencies (Nuclear Insurance) (Details) - Nuclear Insurance	9 Months Ended
	Sep. 30, 2017 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Federal limit on public liability claims from nuclear incident, approximate	$ 13,400,000,000
SCE and other owners of San Onofre and Palo Verde | San Onofre and Palo Verde
Schedule Of Commitments And Contingencies [Line Items]
Loss limit, property damage insurance, federal minimum requirement	1,060,000,000
Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Limit on assessment of retrospective premium adjustments, per year, approximate	52,000,000
Maximum assessment per each nuclear incident	255,000,000
Maximum yearly assessment per nuclear incident	$ 38,000,000

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Commitments and Contingencies (Wildfire Insurance) (Details) - Southern California Edison	Sep. 30, 2017 USD ($)
Schedule Of Commitments And Contingencies [Line Items]
Threshold for wildfire claims (new lines for additional coverage)	$ 1,000,000,000
Self-insured retention per wildfire occurrence	$ 10,000,000

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Commitments and Contingencies (Spent Nuclear Fuel) (Details) - USD ($) $ in Millions	1 Months Ended
	Aug. 30, 2017	Apr. 30, 2016	Jun. 30, 2010	Oct. 30, 2017	Feb. 28, 2017	Sep. 30, 2016
SCE and other owners of San Onofre and Palo Verde
Schedule Of Commitments And Contingencies [Line Items]
Damages sought			$ 142
Damage award		$ 162
Claim to recover damages incurred					$ 43
Southern California Edison
Schedule Of Commitments And Contingencies [Line Items]
Damages sought			$ 112
Damage award		$ 124
Claim to recover damages incurred				$ 59	$ 34	$ 56
Alternative site exploration	$ 4

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Commitments and Contingencies (SCE Collective Bargaining Agreement) (Details) - Southern California Edison - Employees covered by collective bargaining agreements - employee	Oct. 02, 2017	Sep. 30, 2017
Concentration Risk [Line Items]
Full time employees		3,900
Subsequent event
Concentration Risk [Line Items]
Wage increase	3.00%

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Preferred and Preference Stock of SCE (Details) - USD ($)		3 Months Ended	9 Months Ended
	Jul. 27, 2017	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Redemption of trust securities			$ 475,000,000	$ 125,000,000
Southern California Edison
Class of Stock [Line Items]
Redemption of trust securities			475,000,000	$ 125,000,000
Southern California Edison | Series F Preferred Stock
Class of Stock [Line Items]
Redemption of trust securities	$ 475,000,000
Southern California Edison | Trust VI | Variable Interest Entity, Not Primary Beneficiary | Series L Preferred Stock
Class of Stock [Line Items]
Liquidation preference		$ 475,000,000	$ 475,000,000
Security dividend rate		5.00%	5.00%
Preferred shares issued		190,004
Liquidation value (in dollars per share)		$ 2,500	$ 2,500

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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Pension and PBOP – net loss:
Other	$ (2)	$ 0	$ 0	$ 0
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(48)	(53)	(53)	(56)
Pension and PBOP – net loss:
Ending Balance	(48)	(51)	(48)	(51)
Accumulated Other Comprehensive Loss | Southern California Edison
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(18)	(20)	(20)	(22)
Pension and PBOP – net loss:
Ending Balance	(18)	(19)	(18)	(19)
Accumulated Defined Benefit Plans Adjustment
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss	2	2	5	5
Other	(2)	0	0	0
Change	0	2	5	5
Accumulated Defined Benefit Plans Adjustment | Southern California Edison
Pension and PBOP – net loss:
Reclassified from accumulated other comprehensive loss	0	1	2	3
Change	$ 0	$ 1	$ 2	$ 3

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Interest and Other Income and Other Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
SCE interest and other income:
Total Edison International interest and other income	$ 42	$ 32	$ 111	$ 97
SCE other expenses:
Total other expenses	9	9	28	29
Edison International Parent and Other
SCE interest and other income:
Other income of Edison International Parent and Other	0	0	0	0
SCE other expenses:
Other expenses of Edison International Parent and Other	0	0	0	3
Southern California Edison
SCE interest and other income:
Equity allowance for funds used during construction	24	16	65	58
Increase in cash surrender value of life insurance policies	12	12	34	29
Interest income	3	1	5	4
Other	3	3	7	6
Total SCE interest and other income	42	32	111	97
Total Edison International interest and other income	42	32	111	97
SCE other expenses:
Civic, political and related activities and donations	6	6	17	19
Other	3	3	11	7
Total SCE other expenses	9	9	28	26
Total other expenses	$ 9	$ 9	$ 28	$ 26

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Supplemental Cash Flows Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash payments for interest and taxes:
Interest, net of amounts capitalized	$ 453	$ 417
Tax payments, net of refunds	13	12
Common stock
Dividends declared but not paid:
Dividends declared but not paid	177	156
Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid	1	1
Southern California Edison
Cash payments for interest and taxes:
Interest, net of amounts capitalized	421	408
Tax payments, net of refunds	20	35
Dividends declared but not paid:
Accrued capital expenditures	319	268
Southern California Edison | Common stock
Dividends declared but not paid:
Dividends declared but not paid	191	0
Southern California Edison | Preferred and preference stock
Dividends declared but not paid:
Dividends declared but not paid	$ 1	$ 1