Quarterly Financial Data (Unaudited) (Details) - USD ($)	3 Months Ended																	12 Months Ended					24 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Jun. 30, 2013	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2014
Quarterly Financial Data [Line Items]
Total operating revenue	$ 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 income	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 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 (loss) from discontinued operations, net	(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
Net income																		1,117,000,000		1,721,000,000		1,015,000,000
Net income (loss) attributable to common shareholders	$ (79,000,000)		$ 421,000,000		$ 379,000,000		$ 299,000,000		$ 420,000,000		$ 480,000,000		$ 536,000,000		$ 176,000,000			$ 1,020,000,000		$ 1,612,000,000		$ 915,000,000
Basic earnings (loss) per share:
Basic earnings (loss) per share – continuing operations (in dollars per share)	$ (0.22)		$ 1.16		$ 1.16		$ 0.92		$ 1.17		$ 1.52		$ 1.08		$ 0.61			$ 3.02		$ 4.38		$ 2.70
Basic earnings (loss) per share – discontinued operations (in dollars per share)	(0.02)		0.13		0.00		0.00		0.12		(0.05)		0.56		(0.07)			0.11		0.57		0.11
Total (in dollars per share)	(0.24)		1.29		1.16		0.92		1.29		1.47		1.64		0.54			3.13		4.95		2.81
Diluted earnings (loss) per share:
Diluted earnings (loss) per share – continuing operations (in dollars per share)	(0.22)		1.15		1.15		0.91		1.15		1.51		1.07		0.61			2.99		4.33		2.67
Diluted earnings (loss) per share – discontinued operations (in dollars per share)	(0.02)		0.13		0.00		0.00		0.12		(0.05)		0.56		(0.07)			0.11		0.56		0.11
Total (in dollars per share)	(0.24)		1.28		1.15		0.91		1.27		1.46		1.63		0.54			3.10		4.89		2.78
Dividends declared per share (in dollars per share)	0.48		0.4175		0.4175		0.4175		0.4175		0.3550		0.3550		0.3550			1.7325		1.4825		$ 1.3675
Common stock prices:
High (in dollars per share)	66.29		63.18		64.55		69.59		68.74		59.54		58.24		56.61			69.59		68.74
Low (in dollars per share)	57.51		55.52		55.18		61.02		55.88		54.12		53.63		44.74			55.18		44.74
Close (in dollars per share)	$ 59.21		$ 63.07		$ 55.58		$ 62.47		$ 65.48		$ 55.92		$ 58.11		$ 56.61			$ 59.21		$ 65.48			$ 65.48
Impairment and other charges	$ 382,000,000																	$ 5,000,000		$ 157,000,000		$ 571,000,000
Southern California Edison
Quarterly Financial Data [Line Items]
Total operating revenue	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 income	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
Net income	(51,000,000)	[3]	417,000,000	[3]	412,000,000	[3]	333,000,000	[3]	408,000,000	[4]	531,000,000	[4]	392,000,000	[4]	234,000,000	[4]		1,111,000,000	[3]	1,565,000,000	[4]	1,000,000,000
Net income (loss) attributable to common shareholders	(80,000,000)		389,000,000		384,000,000		305,000,000		380,000,000		503,000,000		362,000,000		208,000,000			998,000,000		1,453,000,000		900,000,000
Common stock prices:
Common dividends declared	$ 170,000,000		$ 147,000,000		$ 147,000,000		$ 147,000,000		147,000,000		$ 126,000,000		126,000,000		$ 126,000,000			611,000,000		525,000,000
Impairment and other charges																		$ 0		163,000,000		$ 575,000,000
San Onofre | Southern California Edison
Common stock prices:
Impairment and other charges									68,000,000				231,000,000				$ 575,000,000			163,000,000			$ 738,000,000
Asset impairment net of tax									$ 24,000,000				$ 96,000,000				$ 365,000,000			$ 72,000,000			$ 437,000,000

[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.

[3] 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)Total Fourth Third Second FirstOperating revenue$13,380 $3,104 $4,338 $3,014 $2,924Operating income2,529 715 881 593 342Net income11,565 408 531 392 234Net income available for common stock1,453 380 503 362 208Common dividends declared525 147 126 126 126

[4] 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.