Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended					6 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	Jun. 30, 2013
Quarterly Financial Data [Line Items]
Total operating revenue	$ 3,114		$ 4,356		$ 3,016		$ 2,926		$ 2,943		$ 3,960		$ 3,046		$ 2,632		$ 13,413		$ 12,581		$ 11,862
Operating income (loss)	693		874		575		331		505		789		(71)		492		2,472		1,715		2,285
Income from continuing operations	406	[1]	524	[1]	382	[1]	224	[1]	289	[2]	488	[2]	(82)	[2]	286	[2]	1,536	[1]	979	[2]	1,594
Income (loss) from discontinued operations, net	39		(16)		184		(22)		37		(25)		12		12		185		36		(1,686)
Net income (loss)																	1,721		1,015		(92)
Net income (loss) attributable to common shareholders	420		480		536		176		301		438		(94)		271		1,612		915		(183)
Basic earnings (loss) per share:
Basic earnings (loss) per share – continuing operations (in dollars per share)	$ 1.17		$ 1.52		$ 1.08		$ 0.61		$ 0.81		$ 1.42		$ (0.33)		$ 0.79		$ 4.38		$ 2.70		$ 4.61
Basic earnings (loss) per share – discontinued operations (in dollars per share)	$ 0.12		$ (0.05)		$ 0.56		$ (0.07)		$ 0.11		$ (0.08)		$ 0.04		$ 0.04		$ 0.57		$ 0.11		$ (5.17)
Total (in dollars per share)	$ 1.29		$ 1.47		$ 1.64		$ 0.54		$ 0.92		$ 1.34		$ (0.29)		$ 0.83		$ 4.95		$ 2.81		$ (0.56)
Diluted earnings (loss) per share:
Diluted earnings (loss) per share – continuing operations (in dollars per share)	$ 1.15		$ 1.51		$ 1.07		$ 0.61		$ 0.81		$ 1.41		$ (0.33)		$ 0.78		$ 4.33		$ 2.67		$ 4.55
Diluted earnings (loss) per share – discontinued operations (in dollars per share)	$ 0.12		$ (0.05)		$ 0.56		$ (0.07)		$ 0.11		$ (0.07)		$ 0.04		$ 0.04		$ 0.56		$ 0.11		$ (5.11)
Total (in dollars per share)	$ 1.27		$ 1.46		$ 1.63		$ 0.54		$ 0.92		$ 1.34		$ (0.29)		$ 0.82		$ 4.89		$ 2.78		$ (0.56)
Dividends declared per share (in dollars per share)	$ 0.4175		$ 0.3550		$ 0.3550		$ 0.3550		$ 0.3550		$ 0.3375		$ 0.3375		$ 0.3375		$ 1.4825		$ 1.3675		$ 1.3125
Common stock prices:
High ($ per share)	$ 68.74		$ 59.54		$ 58.24		$ 56.61		$ 49.95		$ 50.34		$ 54.19		$ 51.24		$ 68.74		$ 54.19
Low ($ per share)	$ 55.88		$ 54.12		$ 53.63		$ 44.74		$ 44.97		$ 44.26		$ 44.86		$ 44.92		$ 44.74		$ 44.26
Close ($ per share)	$ 65.48		$ 55.92		$ 58.11		$ 56.61		$ 46.30		$ 46.06		$ 48.16		$ 50.32		$ 65.48		$ 46.30			$ 48.16
Southern California Edison
Quarterly Financial Data [Line Items]
Total operating revenue	3,104		4,338		3,014		2,924		2,931		3,957		3,045		2,629		13,380		12,562		11,851
Operating income (loss)	715		881		593		342		505		804		(55)		498		2,529		1,751		2,279
Net income (loss)	408	[3]	531	[3]	392	[3]	234	[3]	283	[4]	502	[4]	(67)	[4]	283	[4]	1,565	[3]	1,000	[4]	1,660
Net income (loss) attributable to common shareholders	380		503		362		208		258		477		(91)		256		1,453		900		1,569
Common stock prices:
Common dividends declared	147		126		126		126		126		120		120		120		525		486
San Onofre | Southern California Edison
Common stock prices:
Asset impairment and other charges							231						575				163					575
Asset impairment net of tax							96						365				72					365
Asset Impairment and Other Charges, Impact of Revision of Estimate	68
Asset Impairment and Other Charges, Net of Tax, Impact of Revision of Estimate	$ 24

[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.

[3] In 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 filing for reimbursement of recorded costs.

[4] 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