Schedule I - Condensed Financial Information of Parent (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Assets:
Cash and cash equivalents	$ 146,000,000								$ 170,000,000								$ 146,000,000		$ 170,000,000		$ 1,469,000,000
Other current assets	395,000,000								149,000,000								395,000,000		149,000,000
Total current assets	3,312,000,000								2,672,000,000								3,312,000,000		2,672,000,000
Other	686,000,000								708,000,000								686,000,000		708,000,000
Total assets	46,646,000,000								44,394,000,000								46,646,000,000		44,394,000,000
Liabilities and Equity:
Accounts payable	1,407,000,000								1,423,000,000								1,407,000,000		1,423,000,000
Other current liabilities	1,186,000,000								1,166,000,000								1,186,000,000		1,166,000,000
Total current liabilities	4,881,000,000								3,744,000,000								4,881,000,000		3,744,000,000
Long-term debt	9,825,000,000								9,231,000,000								9,825,000,000		9,231,000,000
Common stockholders' equity	11,691,000,000								11,191,000,000								11,691,000,000		11,191,000,000		11,086,000,000	11,494,000,000
Total liabilities and equity	46,646,000,000								44,394,000,000								46,646,000,000		44,394,000,000
Condensed Statements of Income:
Operating revenue and other income	2,943,000,000		3,960,000,000		3,046,000,000		2,632,000,000		3,060,000,000		3,734,000,000		2,653,000,000		2,415,000,000		12,581,000,000		11,862,000,000		10,588,000,000
Operating expenses and interest expense																	10,866,000,000		9,577,000,000		8,527,000,000
Loss before equity in earnings of subsidiaries	505,000,000		789,000,000		(71,000,000)		492,000,000		765,000,000		713,000,000		420,000,000		389,000,000		1,715,000,000		2,285,000,000		2,061,000,000
Income tax expense (benefit)																	242,000,000		267,000,000		568,000,000
Income from continued operations	289,000,000	[1]	488,000,000	[1]	(82,000,000)	[1]	286,000,000	[1]	812,000,000	[2],[3]	382,000,000	[2],[3]	207,000,000	[2],[3]	196,000,000	[2],[3]	979,000,000	[1]	1,594,000,000	[2],[3]	1,100,000,000
Income (loss) from discontinued operations, net of tax	37,000,000		(25,000,000)		12,000,000		12,000,000		(1,326,000,000)	[4]	(167,000,000)	[4]	(109,000,000)	[4]	(84,000,000)	[4]	36,000,000		(1,686,000,000)	[4]	(1,078,000,000)
Net income (loss)																	1,015,000,000		(92,000,000)		22,000,000
Other comprehensive income (loss)																	74,000,000		52,000,000		(63,000,000)
Comprehensive income (loss)																	989,000,000		(131,000,000)		(100,000,000)
Weighted-average shares of common stock outstanding (in shares)																	326		326		326
Basic earnings (loss) per share – continuing operations (in dollars per share)	$ 0.81		$ 1.42		$ (0.33)		$ 0.79		$ 2.42		$ 1.09		$ 0.56		$ 0.54		$ 2.70		$ 4.61		$ 3.20
Basic earnings (loss) per share – discontinued operations (in dollars per share)	$ 0.11		$ (0.08)		$ 0.04		$ 0.04		$ (4.07)		$ (0.51)		$ (0.33)		$ (0.26)		$ 0.11		$ (5.17)		$ (3.31)
Total (in dollars per share)	$ 0.92		$ 1.34		$ (0.29)		$ 0.83		$ (1.65)		$ 0.58		$ 0.23		$ 0.28		$ 2.81		$ (0.56)		$ (0.11)
Diluted earnings (loss) per share – continuing operations (in dollars per share)	$ 0.81		$ 1.41		$ (0.33)		$ 0.78		$ 2.39		$ 1.09		$ 0.55		$ 0.54		$ 2.67		$ 4.55		$ 3.17
Diluted earnings (loss) per share – discontinued operations (in dollars per share)	$ 0.11		$ (0.07)		$ 0.04		$ 0.04		$ (4.03)		$ (0.51)		$ (0.33)		$ (0.26)		$ 0.11		$ (5.11)		$ (3.28)
Total (in dollars per share)	$ 0.92		$ 1.34		$ (0.29)		$ 0.82		$ (1.64)		$ 0.58		$ 0.22		$ 0.28		$ 2.78		$ (0.56)		$ (0.11)
Condensed Statements of Cash Flows:
Net cash provided by operating activities																	3,203,000,000		3,334,000,000		3,906,000,000
Cash flows from financing activities:
Short-term debt financing, net																	32,000,000		(264,000,000)		410,000,000
Settlements of stock-based compensation, net																	(48,000,000)		(68,000,000)		(15,000,000)
Dividends paid																	(440,000,000)		(424,000,000)		(417,000,000)
Net cash provided by financing activities																	581,000,000		650,000,000		1,107,000,000
Net cash provided by investing activities:																	(3,808,000,000)		(5,283,000,000)		(4,933,000,000)
Net increase in cash and cash equivalents																	(24,000,000)		(1,299,000,000)		80,000,000
Cash and cash equivalents at beginning of year							170,000,000								1,469,000,000		170,000,000		1,469,000,000		1,389,000,000
Cash and cash equivalents at end of year	146,000,000								170,000,000								146,000,000		170,000,000		1,469,000,000
Debt and Credit Agreements
Short-term debt	209,000,000								175,000,000								209,000,000		175,000,000
Weighted average interest rate (as a percent)	0.55%																0.55%
Commitment	1,250,000,000																1,250,000,000
Outstanding borrowings	34,000,000																34,000,000
Consolidated debt to total capitalization, ratio	0.45																0.45
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	34,000,000																34,000,000
Amount available	1,216,000,000																1,216,000,000
Consolidated debt to total capitalization, ratio	0.65																0.65
Edison International
Assets:
Cash and cash equivalents	13,000,000								64,000,000								13,000,000		64,000,000		28,000,000
Other current assets	166,000,000								18,000,000								166,000,000		18,000,000
Total current assets	179,000,000								82,000,000								179,000,000		82,000,000
Investments in subsidiaries	10,328,000,000								9,903,000,000								10,328,000,000		9,903,000,000
Deferred income tax	559,000,000								555,000,000								559,000,000		555,000,000
Other	615,000,000								414,000,000								615,000,000		414,000,000
Total assets	11,681,000,000								10,954,000,000								11,681,000,000		10,954,000,000
Liabilities and Equity:
Accounts payable	3,000,000								105,000,000								3,000,000		105,000,000
Other current liabilities	629,000,000								184,000,000								629,000,000		184,000,000
Total current liabilities	632,000,000								289,000,000								632,000,000		289,000,000
Long-term debt	400,000,000								400,000,000								400,000,000		400,000,000
Other	721,000,000								833,000,000								721,000,000		833,000,000
Common stockholders' equity	9,928,000,000								9,432,000,000								9,928,000,000		9,432,000,000
Total liabilities and equity	11,681,000,000								10,954,000,000								11,681,000,000		10,954,000,000
Condensed Statements of Income:
Operating revenue and other income																	0		0		0
Operating expenses and interest expense																	72,000,000		80,000,000		63,000,000
Loss before equity in earnings of subsidiaries																	(72,000,000)		(80,000,000)		(63,000,000)
Equity in earnings (loss) of subsidiaries																	922,000,000		1,590,000,000		1,077,000,000
Income before income taxes																	850,000,000		1,510,000,000		1,014,000,000
Income tax expense (benefit)																	(29,000,000)		7,000,000		(27,000,000)
Income from continued operations																	879,000,000		1,503,000,000		1,041,000,000
Income (loss) from discontinued operations, net of tax																	36,000,000		(1,686,000,000)		(1,078,000,000)
Net income (loss)																	915,000,000		(183,000,000)		(37,000,000)
Other comprehensive income (loss)																			52,000,000		(63,000,000)
Comprehensive income (loss)																	989,000,000		(131,000,000)		(100,000,000)
Weighted-average shares of common stock outstanding (in shares)																	326		326		326
Basic earnings (loss) per share – continuing operations (in dollars per share)																	$ 2.70		$ 4.61		$ 3.20
Basic earnings (loss) per share – discontinued operations (in dollars per share)																	$ 0.11		$ (5.17)		$ (3.31)
Total (in dollars per share)																	$ 2.81		$ (0.56)		$ (0.11)
Diluted earnings (loss) per share – continuing operations (in dollars per share)																	$ 2.67		$ 4.55		$ 3.17
Diluted earnings (loss) per share – discontinued operations (in dollars per share)																	$ 0.11		$ (5.11)		$ (3.28)
Total (in dollars per share)																	$ 2.78		$ (0.56)		$ (0.11)
Condensed Statements of Cash Flows:
Net cash provided by operating activities																	387,000,000		355,000,000		437,000,000
Cash flows from financing activities:
Payable due to consolidated affiliate																	10,000,000		130,000,000		0
Short-term debt financing, net																	33,000,000		(15,000,000)		(9,000,000)
Settlements of stock-based compensation, net																	(6,000,000)		(10,000,000)		(5,000,000)
Dividends paid																	(440,000,000)		(424,000,000)		(417,000,000)
Net cash provided by financing activities																	(403,000,000)		(319,000,000)		(431,000,000)
Net cash provided by investing activities:																	(35,000,000)		0		1,000,000
Net increase in cash and cash equivalents																	(51,000,000)		36,000,000		7,000,000
Cash and cash equivalents at beginning of year							64,000,000								28,000,000		64,000,000		28,000,000		21,000,000
Cash and cash equivalents at end of year	13,000,000								64,000,000								13,000,000		64,000,000		28,000,000
Dividends [Abstract]
Cash dividends received from consolidated subsidiaries																	486,000,000		469,000,000		461,000,000
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	34,000,000								23,000,000								34,000,000		23,000,000
Current payables due to affiliates	69,000,000								146,000,000								69,000,000		146,000,000
Long-term receivables due from affiliate	486,000,000								322,000,000								486,000,000		322,000,000
Long-term payables due to affiliates	135,000,000								112,000,000								135,000,000		112,000,000
Impairment and other charges, after tax									1,300,000,000
Edison International | Senior Notes Due 2017
Debt and Credit Agreements
Senior notes	400,000,000																400,000,000
Edison International | Revolving credit facility maturing in July 2018
Debt and Credit Agreements
Amount available	1,216,000,000																1,216,000,000
Edison International | Debentures and notes
Debt and Credit Agreements
Interest rate on debt (as a percent)	3.75%																3.75%
Southern California Edison
Assets:
Cash and cash equivalents	54,000,000								45,000,000								54,000,000		45,000,000		57,000,000
Other current assets	393,000,000								171,000,000								393,000,000		171,000,000
Total current assets	3,075,000,000								2,562,000,000								3,075,000,000		2,562,000,000
Other	398,000,000								531,000,000								398,000,000		531,000,000
Total assets	46,050,000,000								44,034,000,000								46,050,000,000		44,034,000,000
Liabilities and Equity:
Accounts payable	1,373,000,000								1,297,000,000								1,373,000,000		1,297,000,000
Other current liabilities	1,091,000,000								1,105,000,000								1,091,000,000		1,105,000,000
Total current liabilities	4,398,000,000								3,513,000,000								4,398,000,000		3,513,000,000
Long-term debt	9,422,000,000								8,828,000,000								9,422,000,000		8,828,000,000
Common stockholders' equity	12,138,000,000								11,743,000,000								12,138,000,000		11,743,000,000		9,958,000,000	9,207,000,000
Total liabilities and equity	46,050,000,000								44,034,000,000								46,050,000,000		44,034,000,000
Condensed Statements of Income:
Operating revenue and other income	2,931,000,000		3,957,000,000		3,045,000,000		2,629,000,000		3,057,000,000		3,731,000,000		2,651,000,000		2,412,000,000		12,562,000,000		11,851,000,000		10,577,000,000
Operating expenses and interest expense																	10,811,000,000		9,572,000,000		8,454,000,000
Loss before equity in earnings of subsidiaries	505,000,000		804,000,000		(55,000,000)		498,000,000		792,000,000		659,000,000		430,000,000		397,000,000		1,751,000,000		2,279,000,000		2,123,000,000
Income tax expense (benefit)																	279,000,000		214,000,000		601,000,000
Net income (loss)	283,000,000	[1],[2],[3]	502,000,000	[1],[2],[3]	(67,000,000)	[1],[2],[3]	283,000,000	[1],[2],[3]	858,000,000	[2],[3]	388,000,000	[2],[3]	214,000,000	[2],[3]	201,000,000	[2],[3]	1,000,000,000	[1],[2],[3]	1,660,000,000	[2],[3]	1,144,000,000
Other comprehensive income (loss)																	18,000,000		(5,000,000)		1,000,000
Condensed Statements of Cash Flows:
Net cash provided by operating activities																	3,284,000,000		4,086,000,000		3,261,000,000
Cash flows from financing activities:
Short-term debt financing, net																	(1,000,000)		(250,000,000)		419,000,000
Settlements of stock-based compensation, net																	(43,000,000)		(57,000,000)		(10,000,000)
Dividends paid																	(587,000,000)		(551,000,000)		(520,000,000)
Net cash provided by financing activities																	508,000,000		256,000,000		799,000,000
Net cash provided by investing activities:																	(3,783,000,000)		(4,354,000,000)		(4,260,000,000)
Net increase in cash and cash equivalents																	9,000,000		(12,000,000)		(200,000,000)
Cash and cash equivalents at beginning of year							45,000,000								57,000,000		45,000,000		57,000,000		257,000,000
Cash and cash equivalents at end of year	54,000,000								45,000,000								54,000,000		45,000,000		57,000,000
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)																	49.20%
Capacity to pay additional dividends																	247,000,000
Restriction on net assets	11,900,000,000																11,900,000,000
Debt and Credit Agreements
Short-term debt	175,000,000								175,000,000								175,000,000		175,000,000
Related Party Transactions
Expenses from services provided by SCE																	3,000,000		4,000,000		3,000,000
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	175,000,000																175,000,000
Amount available	2,459,000,000																2,459,000,000
Southern California Edison | Debentures and notes
Debt and Credit Agreements
Long-term Debt, Gross	$ 307,000,000								$ 307,000,000								$ 307,000,000		$ 307,000,000

[1] 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.

[2] During the fourth quarter of 2012, SCE corrected errors, primarily related to deferred taxes, that resulted in a net earnings benefit of $33 million which were not considered material to the current and prior period consolidated financial statements.

[3] During the fourth quarter of 2012, SCE implemented the 2012 GRC Decision which resulted in an earnings impact of approximately $500 million.

[4] During the fourth quarter of 2012, Edison International recorded a full impairment of its investment in EME. See Note 16 for further information.