Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended					3 Months Ended																12 Months Ended					6 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, 2013 Southern California Edison		Sep. 30, 2013 Southern California Edison		Jun. 30, 2013 Southern California Edison		Mar. 31, 2013 Southern California Edison		Dec. 31, 2012 Southern California Edison		Sep. 30, 2012 Southern California Edison		Jun. 30, 2012 Southern California Edison		Mar. 31, 2012 Southern California Edison		Dec. 31, 2013 Southern California Edison		Dec. 31, 2012 Southern California Edison		Dec. 31, 2011 Southern California Edison	Jun. 30, 2013 San Onofre [Member] Southern California Edison
Quarterly Financial Data [Line Items]
Asset impairment and other charges																																											$ 575
Asset impairment net of tax																																											365
Earnings benefit from implementation of 2012 GRC Decision																														500
Immaterial error correction																														33
Total operating revenue	2,943		3,960		3,046		2,632		3,060		3,734		2,653		2,415		12,581		11,862		10,588	2,931		3,957		3,045		2,629		3,057		3,731		2,651		2,412		12,562		11,851		10,577
Operating income	505		789		(71)		492		765		713		420		389		1,715		2,285		2,061	505		804		(55)		498		792		659		430		397		1,751		2,279		2,123
Net income (loss)																	1,015		(92)		22	283	[1],[2],[3]	502	[1],[2],[3]	(67)	[1],[2],[3]	283	[1],[2],[3]	858	[1],[2]	388	[1],[2]	214	[1],[2]	201	[1],[2]	1,000	[1],[2],[3]	1,660	[1],[2]	1,144
Income from continuing operations	289	[3]	488	[3]	(82)	[3]	286	[3]	812	[1],[2]	382	[1],[2]	207	[1],[2]	196	[1],[2]	979	[3]	1,594	[1],[2]	1,100
Income (loss) from discontinued operations, net of tax	37		(25)		12		12		(1,326)	[4]	(167)	[4]	(109)	[4]	(84)	[4]	36		(1,686)	[4]	(1,078)
Net income attributable to common shareholders	301		438		(94)		271		(539)		190		74		93		915		(183)		(37)	258		477		(91)		256		833		363		191		182		900		1,569		1,085
Basic earnings (loss) per share:
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 basic earnings (loss) per share (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:
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 diluted earnings (loss) per share (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)
Dividends declared per share (in dollars per share)	$ 0.3550		$ 0.3375		$ 0.3375		$ 0.3375		$ 0.3375		$ 0.325		$ 0.325		$ 0.325		$ 1.3675		$ 1.3125		$ 1.285
Common dividends declared																						$ 126		$ 120		$ 120		$ 120		$ 120		$ 116		$ 116		$ 116		$ 486		$ 469
Common stock prices:
High	$ 49.95		$ 50.34		$ 54.19		$ 51.24		$ 47.96		$ 46.94		$ 46.55		$ 44.50		$ 54.19		$ 47.96
Low	$ 44.97		$ 44.26		$ 44.86		$ 44.92		$ 42.57		$ 43.10		$ 41.42		$ 39.60		$ 44.26		$ 39.60
Close	$ 46.30		$ 46.06		$ 48.16		$ 50.32		$ 45.19		$ 45.69		$ 46.20		$ 42.51		$ 46.30		$ 45.19

[1] 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.

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

[3] 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.

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