Schedule I - Condensed Financial Information of Parent (Details)	3 Months Ended																12 Months Ended
	Dec. 31, 2015 USD ($)		Sep. 30, 2015 USD ($)		Jun. 30, 2015 USD ($)		Mar. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)		Sep. 30, 2014 USD ($)		Jun. 30, 2014 USD ($)		Mar. 31, 2014 USD ($)		Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)		Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)
Assets:
Cash and cash equivalents	$ 161,000,000						$ 132,000,000		$ 132,000,000						$ 146,000,000		$ 132,000,000		$ 146,000,000		$ 170,000,000	$ 161,000,000	$ 132,000,000	$ 146,000,000	$ 170,000,000
Other current assets																						251,000,000	376,000,000
Total current assets																						2,654,000,000	3,567,000,000
Other long-term assets																						441,000,000	349,000,000
Total assets																						50,310,000,000	49,734,000,000
Liabilities and equity:
Short-term debt																						695,000,000	1,291,000,000
Current portion of long-term debt																						295,000,000	504,000,000
Other current liabilities																						967,000,000	1,205,000,000
Total current liabilities																						4,927,000,000	5,479,000,000
Long-term debt																						10,964,000,000	10,234,000,000
Total equity																						13,388,000,000	12,982,000,000	11,691,000,000	11,191,000,000
Total liabilities and equity																						50,310,000,000	$ 49,734,000,000
Condensed Statements of Income:
Operating revenue and other income	2,341,000,000		$ 3,763,000,000		$ 2,908,000,000		2,512,000,000		3,114,000,000		$ 4,356,000,000		$ 3,016,000,000		2,926,000,000		11,524,000,000		13,413,000,000		12,581,000,000
Operating expenses and interest expense																	9,516,000,000		10,941,000,000		10,866,000,000
Loss before equity in earnings of subsidiaries	340,000,000		608,000,000		524,000,000		538,000,000		693,000,000		874,000,000		575,000,000		331,000,000		2,008,000,000		2,472,000,000		1,715,000,000
Income tax benefit																	486,000,000		443,000,000		242,000,000
Income from continuing operations	(47,000,000)	[1]	405,000,000	[1]	406,000,000	[1]	318,000,000	[1]	406,000,000	[2]	524,000,000	[2]	382,000,000	[2]	224,000,000	[2]	1,082,000,000	[1]	1,536,000,000	[2]	979,000,000
Income from discontinued operations, net of tax	(8,000,000)		43,000,000		0		0		39,000,000		(16,000,000)		184,000,000		(22,000,000)		35,000,000		185,000,000		36,000,000
Other comprehensive income (loss), net of tax																	2,000,000		(45,000,000)		74,000,000
Comprehensive income																	1,022,000,000		1,567,000,000		989,000,000
Condensed Statements of Cash Flows:
Net cash provided by (used in) operating activities																	4,509,000,000		3,248,000,000		2,967,000,000
Cash flows from financing activities:
Short-term debt financing, net																	(572,000,000)		1,079,000,000		32,000,000
Dividends paid																	(544,000,000)		(463,000,000)		(440,000,000)
Net cash (used in) provided by financing activities																	(588,000,000)		645,000,000		581,000,000
Net cash used in investing activities:																	(3,892,000,000)		(3,907,000,000)		(3,572,000,000)
Net decrease in cash and cash equivalents																	29,000,000		(14,000,000)		(24,000,000)
Cash and cash equivalents, beginning of year							132,000,000								146,000,000		132,000,000		146,000,000		170,000,000
Cash and cash equivalents, end of year	161,000,000								132,000,000								161,000,000		132,000,000		146,000,000
Senior Notes Due 2017
Debt and Credit Agreements
Interest rate on debt (as a percent)																							3.75%
Credit Facility July 2020
Debt and Credit Agreements
Commitment																						1,250,000,000
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)																						(646,000,000)
Amount available																						604,000,000
Edison International
Assets:
Cash and cash equivalents	7,000,000						8,000,000		8,000,000						13,000,000		8,000,000		13,000,000		64,000,000	7,000,000	$ 8,000,000	13,000,000	64,000,000
Other current assets																						259,000,000	531,000,000
Total current assets																						266,000,000	539,000,000
Investments in subsidiaries																						12,696,000,000	12,416,000,000
Deferred income taxes																						626,000,000	547,000,000
Other long-term assets																						111,000,000	172,000,000
Total assets																						13,699,000,000	13,674,000,000
Liabilities and equity:
Short-term debt																						646,000,000	619,000,000
Current portion of long-term debt																						214,000,000	204,000,000
Other current liabilities																						368,000,000	377,000,000
Total current liabilities																						1,228,000,000	1,200,000,000
Long-term debt																						399,000,000	610,000,000
Other long-term liabilities																						704,000,000	904,000,000
Total equity																						11,368,000,000	10,960,000,000
Total liabilities and equity																						$ 13,699,000,000	$ 13,674,000,000
Condensed Statements of Income:
Operating revenue and other income																	3,000,000		3,000,000		0
Operating expenses and interest expense																	78,000,000		94,000,000		72,000,000
Loss before equity in earnings of subsidiaries																	(75,000,000)		(91,000,000)		(72,000,000)
Equity in earnings of subsidiaries																	1,025,000,000		1,482,000,000		922,000,000
Income before income taxes																	950,000,000		1,391,000,000		850,000,000
Income tax benefit																	(35,000,000)		(36,000,000)		(29,000,000)
Income from continuing operations																	985,000,000		1,427,000,000		879,000,000
Income from discontinued operations, net of tax																	35,000,000		185,000,000		36,000,000
Net income																	1,020,000,000		1,612,000,000		915,000,000
Other comprehensive income (loss), net of tax																	2,000,000		(45,000,000)		74,000,000
Comprehensive income																	1,022,000,000		1,567,000,000		989,000,000
Condensed Statements of Cash Flows:
Net cash provided by (used in) operating activities																	641,000,000		(73,000,000)		387,000,000
Cash flows from financing activities:
Payable due to affiliate																	54,000,000		66,000,000		10,000,000
Short-term debt financing, net																	26,000,000		584,000,000		33,000,000
Settlements of stock-based compensation, net																	(42,000,000)		(24,000,000)		(6,000,000)
Dividends paid																	(544,000,000)		(463,000,000)		(440,000,000)
Net cash (used in) provided by financing activities																	(506,000,000)		163,000,000		(403,000,000)
Net cash used in investing activities:																	(136,000,000)		(95,000,000)		(35,000,000)
Net decrease in cash and cash equivalents																	(1,000,000)		(5,000,000)		(51,000,000)
Cash and cash equivalents, beginning of year							8,000,000								13,000,000		8,000,000		13,000,000		64,000,000
Cash and cash equivalents, end of year	7,000,000								8,000,000								7,000,000		8,000,000		13,000,000
Dividends [Abstract]
Cash dividends received from consolidated subsidiaries																	$ 758,000,000		378,000,000		486,000,000
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)																	48.00%
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months)																	13 months
Debt and Credit Agreements
Weighted average interest rate (as a percent)																						0.78%	0.45%
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)																							$ (619,000,000)
Related Party Transactions
Current receivables due from affiliates																						$ 252,000,000	267,000,000
Current payables due to affiliates																						149,000,000	213,000,000
Long-term receivables due from affiliate																						105,000,000	125,000,000
Long-term payables due to affiliates																						$ 213,000,000	179,000,000
Edison International | Senior Notes Due 2017
Debt and Credit Agreements
Interest rate on debt (as a percent)																						3.75%
Senior notes																						$ 400,000,000	400,000,000
Edison International | Non-interest Bearing Promissory Notes Due in September 2015
Debt and Credit Agreements
Debt Instrument, Face Amount			204,000,000
Edison International | Non-interest Bearing Promissory Notes Due in September 2016
Debt and Credit Agreements
Debt Instrument, Face Amount																						214,000,000
Edison International | Credit Facility July 2020
Debt and Credit Agreements
Commitment																						1,250,000,000
Edison International | Revolving credit facility maturing in July 2018
Debt and Credit Agreements
Amount available																						$ 604,000,000
Covenant requirement, consolidated debt to total capitalization, ratio																						0.65
Consolidated debt to total capitalization, ratio																						0.47
Southern California Edison
Assets:
Cash and cash equivalents	26,000,000						38,000,000		38,000,000						54,000,000		$ 38,000,000		54,000,000		45,000,000	$ 26,000,000	38,000,000	54,000,000	45,000,000
Other current assets																						234,000,000	390,000,000
Total current assets																						2,443,000,000	3,440,000,000
Other long-term assets																						316,000,000	300,000,000
Total assets																						49,872,000,000	49,456,000,000
Liabilities and equity:
Short-term debt																						49,000,000	667,000,000
Current portion of long-term debt																						79,000,000	300,000,000
Other current liabilities																						760,000,000	1,183,000,000
Total current liabilities																						3,821,000,000	4,611,000,000
Long-term debt																						10,537,000,000	9,624,000,000
Total equity																						13,672,000,000	13,282,000,000	$ 12,138,000,000	$ 11,743,000,000
Total liabilities and equity																						49,872,000,000	49,456,000,000
Condensed Statements of Income:
Operating revenue and other income	2,319,000,000		3,757,000,000		2,901,000,000		2,508,000,000		3,104,000,000		4,338,000,000		3,014,000,000		2,924,000,000		11,485,000,000		13,380,000,000		12,562,000,000
Operating expenses and interest expense																	9,405,000,000		10,851,000,000		10,811,000,000
Loss before equity in earnings of subsidiaries	366,000,000		$ 626,000,000		$ 536,000,000		550,000,000		715,000,000		$ 881,000,000		$ 593,000,000		342,000,000		2,080,000,000		2,529,000,000		1,751,000,000
Income tax benefit																	507,000,000		474,000,000		279,000,000
Other comprehensive income (loss), net of tax																	6,000,000		(17,000,000)		18,000,000
Condensed Statements of Cash Flows:
Net cash provided by (used in) operating activities																	4,624,000,000		3,660,000,000		3,048,000,000
Cash flows from financing activities:
Short-term debt financing, net																	(619,000,000)		490,000,000		(1,000,000)
Dividends paid																	(874,000,000)		(489,000,000)		(587,000,000)
Net cash (used in) provided by financing activities																	(812,000,000)		181,000,000		508,000,000
Net cash used in investing activities:																	(3,824,000,000)		(3,857,000,000)		(3,547,000,000)
Net decrease in cash and cash equivalents																	(12,000,000)		(16,000,000)		9,000,000
Cash and cash equivalents, beginning of year							$ 38,000,000								$ 54,000,000		38,000,000		54,000,000		45,000,000
Cash and cash equivalents, end of year	$ 26,000,000								$ 38,000,000								$ 26,000,000		38,000,000		54,000,000
Dividends [Abstract]
Period for calculation of weighted average common equity component (months)																	13 months
Weighted-average common equity component of total capitalization (as a percent)																	49.90%
Capacity to pay additional dividends																	$ 441,000,000
Restriction on net assets																						13,200,000,000
Southern California Edison | Credit Facility July 2020
Debt and Credit Agreements
Commitment																						2,750,000,000
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)																						(49,000,000)
Amount available																						2,576,000,000
Commercial paper | Edison International
Debt and Credit Agreements
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)																						$ (646,000,000)
Commercial paper | Southern California Edison | Credit Facility July 2020
Liabilities and equity:
Short-term debt																							$ 367,000,000
Debt and Credit Agreements
Weighted average interest rate (as a percent)																						0.51%	0.40%
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)																						$ (49,000,000)
Southern California Edison | Edison International
Related Party Transactions
Expenses from services provided by SCE																	$ 3,000,000		$ 3,000,000		$ 3,000,000

[1] In the fourth quarter of 2015, as result of the 2015 GRC Decision, SCE recorded a $382 million write-down of regulatory assets previously recorded for recovery of deferred income taxes from 2012 – 2014 incremental tax repair deductions. 2014(in millions, except per-share amounts)Total Fourth Third Second FirstOperating revenue$13,413 $3,114 $4,356 $3,016 $2,926Operating income 2,472 693 874 575 331Income from continuing operations11,536 406 524 382 224Income (loss) from discontinued operations, net185 39 (16) 184 (22)Net income attributable to common shareholders1,612 420 480 536 176Basic earnings (loss) per share: Continuing operations$4.38 $1.17 $1.52 $1.08 $0.61 Discontinued operations0.57 0.12 (0.05) 0.56 (0.07)Total$4.95 $1.29 $1.47 $1.64 $0.54Diluted earnings (loss) per share: Continuing operations$4.33 $1.15 $1.51 $1.07 $0.61 Discontinued operations0.56 0.12 (0.05) 0.56 (0.07)Total$4.89 $1.27 $1.46 $1.63 $0.54Dividends declared per share1.4825 0.4175 0.3550 0.3550 0.3550Common stock prices: High68.74 68.74 59.54 58.24 56.61Low44.74 55.88 54.12 53.63 44.74Close65.48 65.48 55.92 58.11 56.61

[2] During the first quarter of 2014, SCE recorded an impairment charge of $231 million ($96 million after-tax) in 2014. During the fourth quarter of 2014, SCE reduced its estimated impact of the San Onofre OII Settlement by $68 million ($24 million after-tax) consistent with the advice for reimbursement of recorded costs.