Consolidated Statements of Changes in Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			$ 11,691	$ 11,191
Net income	508	463	1,276	689
Other comprehensive income (loss)	(10)	3	(10)	8
Common stock dividends declared			(347)	(330)
Dividends, distributions to noncontrolling interests and other			(84)	(75)
Stock-based compensation and other			(57)	(40)
Noncash stock-based compensation and other			20	12
Issuance of preference stock			269	387
Redemption of preference stock				(400)
Balance, at the end of the period	12,758	11,442	12,758	11,442
Dividends declared per common share (in dollars per share)	$ 0.3550	$ 0.3375	$ 1.065	$ 1.0125
Common Stock Including Additional Paid in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,403	2,373
Net income			0	0
Other comprehensive income (loss)			0	0
Common stock dividends declared			0	0
Dividends, distributions to noncontrolling interests and other			0	0
Stock-based compensation and other			22	5
Noncash stock-based compensation and other			20	19
Issuance of preference stock			0	0
Redemption of preference stock				0
Balance, at the end of the period	2,445	2,397	2,445	2,397
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			(13)	(87)
Net income			0	0
Other comprehensive income (loss)			(10)	8
Common stock dividends declared			0	0
Dividends, distributions to noncontrolling interests and other			0	0
Stock-based compensation and other			0	0
Noncash stock-based compensation and other			0	0
Issuance of preference stock			0	0
Redemption of preference stock				0
Balance, at the end of the period	(23)	(79)	(23)	(79)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			7,548	7,146
Net income			1,192	614
Other comprehensive income (loss)			0	0
Common stock dividends declared			(347)	(330)
Dividends, distributions to noncontrolling interests and other			0	0
Stock-based compensation and other			(79)	(45)
Noncash stock-based compensation and other			0	(6)
Issuance of preference stock			0	0
Redemption of preference stock				(8)
Balance, at the end of the period	8,314	7,371	8,314	7,371
Subtotal
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			9,938	9,432
Net income			1,192	614
Other comprehensive income (loss)			(10)	8
Common stock dividends declared			(347)	(330)
Dividends, distributions to noncontrolling interests and other			0	0
Stock-based compensation and other			(57)	(40)
Noncash stock-based compensation and other			20	13
Issuance of preference stock			0	0
Redemption of preference stock				(8)
Balance, at the end of the period	10,736	9,689	10,736	9,689
Preferred Stock and Preference Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			1,753	1,759
Net income			84	75
Other comprehensive income (loss)			0	0
Common stock dividends declared			0	0
Dividends, distributions to noncontrolling interests and other			(84)	(75)
Stock-based compensation and other			0	0
Noncash stock-based compensation and other			0	(1)
Issuance of preference stock			269	387
Redemption of preference stock				(392)
Balance, at the end of the period	2,022	1,753	2,022	1,753
Southern California Edison
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			12,138	11,743
Net income	531	502	1,156	717
Other comprehensive income (loss)	0	2	3	1
Common stock dividends declared			(378)	(360)
Dividends on preferred and preference stock			(84)	(75)
Stock-based compensation and other			(34)	(36)
Noncash stock-based compensation and other			5	14
Issuance of preference stock			269	387
Redemption of preference stock				(400)
Balance, at the end of the period	13,075	11,991	13,075	11,991
Southern California Edison | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,168	2,168
Net income			0	0
Other comprehensive income (loss)			0	0
Common stock dividends declared			0	0
Dividends on preferred and preference stock			0	0
Stock-based compensation and other			0	0
Noncash stock-based compensation and other			0	0
Issuance of preference stock			0	0
Redemption of preference stock				0
Balance, at the end of the period	2,168	2,168	2,168	2,168
Southern California Edison | Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			592	581
Net income			0	0
Other comprehensive income (loss)			0	0
Common stock dividends declared			0	0
Dividends on preferred and preference stock			0	0
Stock-based compensation and other			13	3
Noncash stock-based compensation and other			9	10
Issuance of preference stock			(6)	(13)
Redemption of preference stock				8
Balance, at the end of the period	608	589	608	589
Southern California Edison | Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			(11)	(29)
Net income			0	0
Other comprehensive income (loss)			3	1
Common stock dividends declared			0	0
Dividends on preferred and preference stock			0	0
Stock-based compensation and other			0	0
Noncash stock-based compensation and other			0	0
Issuance of preference stock			0	0
Redemption of preference stock				0
Balance, at the end of the period	(8)	(28)	(8)	(28)
Southern California Edison | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			7,594	7,228
Net income			1,156	717
Other comprehensive income (loss)			0	0
Common stock dividends declared			(378)	(360)
Dividends on preferred and preference stock			(84)	(75)
Stock-based compensation and other			(47)	(39)
Noncash stock-based compensation and other			(4)	4
Issuance of preference stock			0	0
Redemption of preference stock				(8)
Balance, at the end of the period	8,237	7,467	8,237	7,467
Southern California Edison | Preferred Stock and Preference Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			1,795	1,795
Net income			0	0
Other comprehensive income (loss)			0	0
Common stock dividends declared			0	0
Dividends on preferred and preference stock			0	0
Stock-based compensation and other			0	0
Noncash stock-based compensation and other			0	0
Issuance of preference stock			275	400
Redemption of preference stock				(400)
Balance, at the end of the period	$ 2,070	$ 1,795	$ 2,070	$ 1,795