Schedule I - Condensed Financial Information of Parent (Details) (USD $)	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Assets:
Cash and cash equivalents	$ 132,000,000								$ 146,000,000								$ 132,000,000		$ 146,000,000		$ 170,000,000
Other current assets	376,000,000								395,000,000								376,000,000		395,000,000
Total current assets	4,019,000,000								3,312,000,000								4,019,000,000		3,312,000,000
Other long-term assets	349,000,000								686,000,000								349,000,000		686,000,000
Total assets	50,186,000,000								46,646,000,000								50,186,000,000		46,646,000,000
Liabilities and equity:
Short-term debt	1,291,000,000								209,000,000								1,291,000,000		209,000,000
Current portion of long-term debt	504,000,000								601,000,000								504,000,000		601,000,000
Other current liabilities	1,205,000,000								1,186,000,000								1,205,000,000		1,186,000,000
Total current liabilities	5,479,000,000								4,881,000,000								5,479,000,000		4,881,000,000
Long-term debt	10,234,000,000								9,825,000,000								10,234,000,000		9,825,000,000
Total equity	12,982,000,000								11,691,000,000								12,982,000,000		11,691,000,000		11,191,000,000	11,086,000,000
Total liabilities and equity	50,186,000,000								46,646,000,000								50,186,000,000		46,646,000,000
Condensed Statements of Income:
Operating revenue and other income	3,114,000,000		4,356,000,000		3,016,000,000		2,926,000,000		2,943,000,000		3,960,000,000		3,046,000,000		2,632,000,000		13,413,000,000		12,581,000,000		11,862,000,000
Operating expenses and interest expense																	10,941,000,000		10,866,000,000		9,577,000,000
Loss before equity in earnings of subsidiaries	693,000,000		874,000,000		575,000,000		331,000,000		505,000,000		789,000,000		(71,000,000)		492,000,000		2,472,000,000		1,715,000,000		2,285,000,000
Income tax expense (benefit)																	443,000,000		242,000,000		267,000,000
Income from continuing operations	406,000,000	[1]	524,000,000	[1]	382,000,000	[1]	224,000,000	[1]	289,000,000	[2]	488,000,000	[2]	(82,000,000)	[2]	286,000,000	[2]	1,536,000,000	[1]	979,000,000	[2]	1,594,000,000
Income (loss) from discontinued operations, net of tax	39,000,000		(16,000,000)		184,000,000		(22,000,000)		37,000,000		(25,000,000)		12,000,000		12,000,000		185,000,000		36,000,000		(1,686,000,000)
Net income (loss)	420,000,000		480,000,000		536,000,000		176,000,000		301,000,000		438,000,000		(94,000,000)		271,000,000		1,612,000,000		915,000,000		(183,000,000)
Net income (loss)	420,000,000		480,000,000		536,000,000		176,000,000		301,000,000		438,000,000		(94,000,000)		271,000,000		1,612,000,000		915,000,000		(183,000,000)
Other comprehensive income (loss), net of tax																	(45,000,000)		74,000,000		52,000,000
Comprehensive income (loss)																	1,567,000,000		989,000,000		(131,000,000)
Condensed Statements of Cash Flows:
Net cash provided (used) by operating activities																	3,248,000,000		2,967,000,000		3,334,000,000
Cash flows from financing activities:
Short-term debt financing, net																	1,079,000,000		32,000,000		(264,000,000)
Dividends paid																	(463,000,000)		(440,000,000)		(424,000,000)
Net cash provided by financing activities																	645,000,000		581,000,000		650,000,000
Net cash used by investing activities																	(3,907,000,000)		(3,572,000,000)		(5,283,000,000)
Net increase (decrease) in cash and cash equivalents																	(14,000,000)		(24,000,000)		(1,299,000,000)
Cash and cash equivalents, beginning of year							146,000,000								170,000,000		146,000,000		170,000,000		1,469,000,000
Cash and cash equivalents, end of year	132,000,000								146,000,000								132,000,000		146,000,000		170,000,000
Debt and Credit Agreements
Weighted average interest rate (as a percent)	0.45%								0.55%								0.45%		0.55%
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)	(619,000,000)								(34,000,000)								(619,000,000)		(34,000,000)
Related Party Transactions
Income (loss) from discontinued operations, net of tax	39,000,000		(16,000,000)		184,000,000		(22,000,000)		37,000,000		(25,000,000)		12,000,000		12,000,000		185,000,000		36,000,000		(1,686,000,000)
Senior Notes Due 2017
Debt and Credit Agreements
Interest rate on debt (as a percent)	3.75%								3.75%								3.75%		3.75%
Revolving credit facility maturing in July 2018
Debt and Credit Agreements
Commitment	1,250,000,000																1,250,000,000
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)	(619,000,000)																(619,000,000)
Amount available	631,000,000																631,000,000
Covenant requirement, consolidated debt to total capitalization, ratio	0.65																0.65
Consolidated debt to total capitalization, ratio	0.48																0.48
Edison International
Assets:
Cash and cash equivalents	8,000,000								13,000,000								8,000,000		13,000,000		64,000,000
Other current assets	531,000,000								166,000,000								531,000,000		166,000,000
Total current assets	539,000,000								179,000,000								539,000,000		179,000,000
Investments in subsidiaries	12,416,000,000								10,328,000,000								12,416,000,000		10,328,000,000
Deferred income taxes	547,000,000								559,000,000								547,000,000		559,000,000
Other long-term assets	172,000,000								615,000,000								172,000,000		615,000,000
Total assets	13,674,000,000								11,681,000,000								13,674,000,000		11,681,000,000
Liabilities and equity:
Short-term debt	619,000,000								34,000,000								619,000,000		34,000,000
Current portion of long-term debt	204,000,000								0								204,000,000		0
Other current liabilities	377,000,000								598,000,000								377,000,000		598,000,000
Total current liabilities	1,200,000,000								632,000,000								1,200,000,000		632,000,000
Long-term debt	610,000,000								400,000,000								610,000,000		400,000,000
Other long-term liabilities	904,000,000								721,000,000								904,000,000		721,000,000
Total equity	10,960,000,000								9,928,000,000								10,960,000,000		9,928,000,000
Total liabilities and equity	13,674,000,000								11,681,000,000								13,674,000,000		11,681,000,000
Condensed Statements of Income:
Operating revenue and other income																	3,000,000		0		0
Operating expenses and interest expense																	94,000,000		72,000,000		80,000,000
Loss before equity in earnings of subsidiaries																	(91,000,000)		(72,000,000)		(80,000,000)
Equity in earnings of subsidiaries																	1,482,000,000		922,000,000		1,590,000,000
Income before income taxes																	1,391,000,000		850,000,000		1,510,000,000
Income tax expense (benefit)																	(36,000,000)		(29,000,000)		7,000,000
Income from continuing operations																	1,427,000,000		879,000,000		1,503,000,000
Income (loss) from discontinued operations, net of tax																	185,000,000		36,000,000		(1,686,000,000)
Net income (loss)																	1,612,000,000		915,000,000		(183,000,000)
Net income (loss)																	1,612,000,000		915,000,000		(183,000,000)
Other comprehensive income (loss), net of tax																	(45,000,000)		74,000,000		52,000,000
Comprehensive income (loss)																	1,567,000,000		989,000,000		(131,000,000)
Condensed Statements of Cash Flows:
Net cash provided (used) by operating activities																	(73,000,000)		387,000,000		355,000,000
Cash flows from financing activities:
Payable due to affiliate																	66,000,000		10,000,000		130,000,000
Short-term debt financing, net																	584,000,000		33,000,000		(15,000,000)
Settlements of stock-based compensation, net																	(24,000,000)		(6,000,000)		(10,000,000)
Dividends paid																	(463,000,000)		(440,000,000)		(424,000,000)
Net cash provided by financing activities																	163,000,000		(403,000,000)		(319,000,000)
Net cash used by investing activities																	(95,000,000)		(35,000,000)		0
Net increase (decrease) in cash and cash equivalents																	(5,000,000)		(51,000,000)		36,000,000
Cash and cash equivalents, beginning of year							13,000,000								64,000,000		13,000,000		64,000,000		28,000,000
Cash and cash equivalents, end of year	8,000,000								13,000,000								8,000,000		13,000,000		64,000,000
Dividends [Abstract]
Cash dividends received from consolidated subsidiaries																	378,000,000		486,000,000		469,000,000
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)																	48.00%
Related Party Transactions
Current receivables due from affiliates	267,000,000								34,000,000								267,000,000		34,000,000
Current payables due to affiliates	213,000,000								69,000,000								213,000,000		69,000,000
Long-term receivables due from affiliate	125,000,000								486,000,000								125,000,000		486,000,000
Long-term payables due to affiliates	179,000,000								135,000,000								179,000,000		135,000,000
Income (loss) from discontinued operations, net of tax																	185,000,000		36,000,000		(1,686,000,000)
Edison International | Senior Notes Due 2017
Debt and Credit Agreements
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 | Revolving credit facility maturing in July 2018
Debt and Credit Agreements
Amount available	631,000,000																631,000,000
Southern California Edison
Assets:
Cash and cash equivalents	38,000,000								54,000,000								38,000,000		54,000,000		45,000,000
Other current assets	390,000,000								393,000,000								390,000,000		393,000,000
Total current assets	3,440,000,000								3,075,000,000								3,440,000,000		3,075,000,000
Other long-term assets	300,000,000								398,000,000								300,000,000		398,000,000
Total assets	49,456,000,000								46,050,000,000								49,456,000,000		46,050,000,000
Liabilities and equity:
Short-term debt	667,000,000								175,000,000								667,000,000		175,000,000
Current portion of long-term debt	300,000,000								600,000,000								300,000,000		600,000,000
Other current liabilities	1,183,000,000								1,034,000,000								1,183,000,000		1,034,000,000
Total current liabilities	4,820,000,000								4,398,000,000								4,820,000,000		4,398,000,000
Long-term debt	9,624,000,000								9,422,000,000								9,624,000,000		9,422,000,000
Total equity	13,282,000,000								12,138,000,000								13,282,000,000		12,138,000,000		11,743,000,000	9,958,000,000
Total liabilities and equity	49,456,000,000								46,050,000,000								49,456,000,000		46,050,000,000
Condensed Statements of Income:
Operating revenue and other income	3,104,000,000		4,338,000,000		3,014,000,000		2,924,000,000		2,931,000,000		3,957,000,000		3,045,000,000		2,629,000,000		13,380,000,000		12,562,000,000		11,851,000,000
Operating expenses and interest expense																	10,851,000,000		10,811,000,000		9,572,000,000
Loss before equity in earnings of subsidiaries	715,000,000		881,000,000		593,000,000		342,000,000		505,000,000		804,000,000		(55,000,000)		498,000,000		2,529,000,000		1,751,000,000		2,279,000,000
Income tax expense (benefit)																	474,000,000		279,000,000		214,000,000
Net income (loss)	380,000,000		503,000,000		362,000,000		208,000,000		258,000,000		477,000,000		(91,000,000)		256,000,000		1,453,000,000		900,000,000		1,569,000,000
Net income (loss)	380,000,000		503,000,000		362,000,000		208,000,000		258,000,000		477,000,000		(91,000,000)		256,000,000		1,453,000,000		900,000,000		1,569,000,000
Other comprehensive income (loss), net of tax																	(17,000,000)		18,000,000		(5,000,000)
Condensed Statements of Cash Flows:
Net cash provided (used) by operating activities																	3,660,000,000		3,048,000,000		4,086,000,000
Cash flows from financing activities:
Short-term debt financing, net																	490,000,000		(1,000,000)		(250,000,000)
Dividends paid																	(489,000,000)		(587,000,000)		(551,000,000)
Net cash provided by financing activities																	181,000,000		508,000,000		256,000,000
Net cash used by investing activities																	(3,857,000,000)		(3,547,000,000)		(4,354,000,000)
Net increase (decrease) in cash and cash equivalents																	(16,000,000)		9,000,000		(12,000,000)
Cash and cash equivalents, beginning of year							54,000,000								45,000,000		54,000,000		45,000,000		57,000,000
Cash and cash equivalents, end of year	38,000,000								54,000,000								38,000,000		54,000,000		45,000,000
Dividends [Abstract]
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months)																	13 months
Period for calculation of weighted average common equity component (months)																	13 months
Weighted-average common equity component of total capitalization (as a percent)																	48.40%
Capacity to pay additional dividends																	87,000,000
Restriction on net assets	13,200,000,000																13,200,000,000
Related Party Transactions
Expenses from services provided by SCE																	3,000,000		3,000,000		4,000,000
Southern California Edison | Revolving credit facility maturing in July 2018
Debt and Credit Agreements
Commitment	2,750,000,000																2,750,000,000
Outstanding borrowings (outstanding commercial paper was $619 million at year-end)	(367,000,000)																(367,000,000)
Amount available	$ 2,274,000,000																$ 2,274,000,000

[1] 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 filing for reimbursement of recorded costs. 2013(in millions, except per-share amounts)Total Fourth Third Second FirstOperating revenue$12,581 $2,943 $3,960 $3,046 $2,632Operating income (loss)1,715 505 789 (71) 492Income (loss) from continuing operations1979 289 488 (82) 286Income (loss) from discontinued operations, net36 37 (25) 12 12Net income (loss) attributable to common shareholders915 301 438 (94) 271Basic earnings (loss) per share: Continuing operations2.70 0.81 1.42 (0.33) 0.79 Discontinued operations0.11 0.11 (0.08) 0.04 0.04Total2.81 0.92 1.34 (0.29) 0.83Diluted earnings (loss) per share: Continuing operations2.67 0.81 1.41 (0.33) 0.78 Discontinued operations0.11 0.11 (0.07) 0.04 0.04Total2.78 0.92 1.34 (0.29) 0.82Dividends declared per share1.3675 0.3550 0.3375 0.3375 0.3375Common stock prices: High54.19 49.95 50.34 54.19 51.24Low44.26 44.97 44.26 44.86 44.92Close46.30 46.30 46.06 48.16 50.32

[2] During the second quarter of 2013, SCE recorded an impairment charge of $575 million ($365 million after-tax) related to the permanent retirement of San Onofre Units 2 and 3.