Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value of Financial Instruments [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The Company’s financial assets and liabilities whose values were recognized at fair value are as follows by level within the fair value hierarchy (in millions):



	As of December 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Nuclear decommissioning trust: ⁽¹⁾
Money market funds	$	—	$	18	$	—	$	18
Debt securities:
Domestic government	6		8		—		14
Corporate credit	—		8		—		8
Non-qualified benefit plan trust: ⁽²⁾
Money market funds	—		1		—		1
Equity securities:
Domestic	3		2		—		5
International	—		—		—		—
Debt securities - domestic government	1		—		—		1
Assets from price risk management activities: ^{(1) (3)}
Electricity	—		7		—		7
Natural gas	—		3		—		3
	$	10	$	47	$	—	$	57
Liabilities - Liabilities from price risk management activities: ^{(1) (3)}
Electricity	$	—	$	28	$	105	$	133
Natural gas	—		144		14		158
	$	—	$	172	$	119	$	291


(1)	Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.


(2)	Excludes insurance policies of $26 million, which are recorded at cash surrender value.


(3)	For further information, see Note 5, Price Risk Management.



	As of December 31, 2014
	Level 1		Level 2		Level 3		Total
Assets:
Nuclear decommissioning trust: ⁽¹⁾
Money market funds	$	—	$	65	$	—	$	65
Debt securities:
Domestic government	7		7		—		14
Corporate credit	—		11		—		11
Non-qualified benefit plan trust: ⁽²⁾
Equity securities:
Domestic	4		1		—		5
International	1		—		—		1
Assets from price risk management activities: ^{(1) (3)}
Electricity	—		4		1		5
Natural gas	—		2		—		2
	$	12	$	90	$	1	$	103
Liabilities - Liabilities from price risk management activities: ^{(1) (3)}
Electricity	$	—	$	32	$	80	$	112
Natural gas	—		95		21		116
	$	—	$	127	$	101	$	228


(1)	Activities are subject to regulation, with certain gains and losses deferred pursuant to regulatory accounting and included in regulatory assets or regulatory liabilities as appropriate.


(2)	Excludes insurance policies of $26 million, which are recorded at cash surrender value.


(3)	For further information, see Note 5, Price Risk Management.

The fair values of the Company’s pension plan assets and other postretirement benefit plan assets by asset category are as follows (in millions):



	Level 1		Level 2		Level 3		Total
As of December 31, 2015:
Defined Benefit Pension Plan assets:
Money market funds	$	—	$	5	$	—	$	5
Equity securities:
Domestic	$	44	$	132	$	—	$	176
International	—		170		—		170
Debt securities:
Domestic government and corporate credit	—		177		—		177
Private equity funds	—		—		22		22
	$	44	$	484	$	22	$	550
Other Postretirement Benefit Plans assets:
Money market funds	$	—	$	7	$	—	$	7
Equity securities:
Domestic	—		10		—		10
International	8		—		—		8
Debt securities—Domestic government	—		5		—		5
	$	8	$	22	$	—	$	30
As of December 31, 2014:
Defined Benefit Pension Plan assets:
Money market funds	$	—	$	6	$	—	$	6
Equity securities:
Domestic	$	42	$	146	$	—	$	188
International	—		171		—		171
Debt securities:
Domestic government and corporate credit	—		197		—		197
Private equity funds	—		—		29		29
	$	42	$	520	$	29	$	591
Other Postretirement Benefit Plans assets:
Money market funds	$	—	$	6	$	—	$	6
Equity securities:
Domestic	10		1		—		11
International	10		—		—		10
Debt securities—Domestic government	5		—		—		5
	$	25	$	7	$	—	$	32

Fair Value, Option, Quantitative Disclosures [Table Text Block]

Quantitative information regarding the significant, unobservable inputs used in the measurement of Level 3 assets and liabilities from price risk management activities is presented below:



						Significant	Price per Unit
	Fair Value				Valuation	Unobservable					Weighted
Commodity Contracts	Assets		Liabilities		Technique	Input	Low		High		Average
	(in millions)
As of December 31, 2015:
Electricity physical forward	$	—	$	105	Discounted cash flow	Electricity forward price (per MWh)	$	8.50	$	84.47	$	30.69
Natural gas financial swaps	—		14		Discounted cash flow	Natural gas forward price (per Dth)	2.06		3.70		2.54
Electricity financial futures	—		—		Discounted cash flow	Electricity forward price (per MWh)	9.98		27.36		19.26
	$	—	$	119
As of December 31, 2014:
Electricity physical forward	$	—	$	77	Discounted cash flow	Electricity forward price (per MWh)	$	11.97	$	122.72	$	37.43
Natural gas financial swaps	—		21		Discounted cash flow	Natural gas forward price (per Dth)	2.88		4.86		3.41
Electricity financial futures	1		3		Discounted cash flow	Electricity forward price (per MWh)	11.97		39.26		27.88
	$	1	$	101

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Changes in the fair value of net liabilities from price risk management activities (net of assets from price risk management activities) classified as Level 3 in the fair value hierarchy were as follows (in millions):



	Years Ended December 31,
	2015			2014
Net liabilities from price risk management activities as of beginning of year	$	100		$	139
Net realized and unrealized losses ^*	80			15
Settlements	—			(4		)
Net transfers out of Level 3 to Level 2	(61		)	(50		)
Net liabilities from price risk management activities as of end of year	$	119		$	100
Level 3 net unrealized losses that have been fully offset by the effect of regulatory accounting	$	80		$	12

* Includes nominal net realized losses in 2015 and $3 million in 2014.

- Definition

Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide. Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided.

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