Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			$ 12,982	$ 11,691
Net income			734	768
Other comprehensive income (loss)	$ 3	$ (2)	2	0
Common stock dividends declared			(272)	(231)
Dividends to noncontrolling interests			(56)	(57)
Stock-based compensation			(55)	(51)
Non-cash stock-based compensation			12	14
Issuance of preference stock				269
Balance, at the end of the period	$ 13,347	$ 12,403	$ 13,347	$ 12,403
Dividends declared per common share (in dollars per share)	$ 0.4175	$ 0.3550	$ 0.8350	$ 0.7100
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			$ 2,445	$ 2,403
Net income			0	0
Other comprehensive income (loss)			0
Common stock dividends declared			0	0
Dividends to noncontrolling interests			0	0
Stock-based compensation			15	17
Non-cash stock-based compensation			12	14
Issuance of preference stock				0
Balance, at the end of the period	$ 2,472	$ 2,434	2,472	2,434
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			(58)	(13)
Net income			0	0
Other comprehensive income (loss)			2
Common stock dividends declared			0	0
Dividends to noncontrolling interests			0	0
Stock-based compensation			0	0
Non-cash stock-based compensation			0	0
Issuance of preference stock				0
Balance, at the end of the period	(56)	(13)	(56)	(13)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			8,573	7,548
Net income			678	712
Other comprehensive income (loss)			0
Common stock dividends declared			(272)	(231)
Dividends to noncontrolling interests			0	0
Stock-based compensation			(70)	(68)
Non-cash stock-based compensation			0	(1)
Issuance of preference stock				0
Balance, at the end of the period	8,909	7,960	8,909	7,960
Subtotal
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			10,960	9,938
Net income			678	712
Other comprehensive income (loss)			2
Common stock dividends declared			(272)	(231)
Dividends to noncontrolling interests			0	0
Stock-based compensation			(55)	(51)
Non-cash stock-based compensation			12	13
Issuance of preference stock				0
Balance, at the end of the period	11,325	10,381	11,325	10,381
Preferred and preference stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,022	1,753
Net income			56	56
Other comprehensive income (loss)			0
Common stock dividends declared			0	0
Dividends to noncontrolling interests			(56)	(57)
Stock-based compensation			0	0
Non-cash stock-based compensation			0	1
Issuance of preference stock				269
Balance, at the end of the period	2,022	2,022	2,022	2,022
Southern California Edison
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			13,282	12,138
Net income			745	626
Other comprehensive income (loss)	1	2	2	3
Common stock dividends declared			(294)	(252)
Dividends declared on preferred and preference stock			(56)	(57)
Stock-based compensation			(17)	(30)
Non-cash stock-based compensation			6	3
Issuance of preference stock				269
Balance, at the end of the period	13,668	12,700	13,668	12,700
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 declared on preferred and preference stock			0	0
Stock-based compensation			0	0
Non-cash stock-based compensation			0	0
Issuance 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			618	592
Net income			0	0
Other comprehensive income (loss)			0	0
Common stock dividends declared			0	0
Dividends declared on preferred and preference stock			0	0
Stock-based compensation			6	12
Non-cash stock-based compensation			6	5
Issuance of preference stock				(6)
Balance, at the end of the period	630	603	630	603
Southern California Edison | Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			(28)	(11)
Net income			0	0
Other comprehensive income (loss)			2	3
Common stock dividends declared			0	0
Dividends declared on preferred and preference stock			0	0
Stock-based compensation			0	0
Non-cash stock-based compensation			0	0
Issuance of preference stock				0
Balance, at the end of the period	(26)	(8)	(26)	(8)
Southern California Edison | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			8,454	7,594
Net income			745	626
Other comprehensive income (loss)			0	0
Common stock dividends declared			(294)	(252)
Dividends declared on preferred and preference stock			(56)	(57)
Stock-based compensation			(23)	(42)
Non-cash stock-based compensation			0	(2)
Issuance of preference stock				0
Balance, at the end of the period	8,826	7,867	8,826	7,867
Southern California Edison | Preferred and preference stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,070	1,795
Other comprehensive income (loss)			0	0
Common stock dividends declared			0	0
Dividends declared on preferred and preference stock			0	0
Stock-based compensation			0	0
Non-cash stock-based compensation			0	0
Issuance of preference stock				275
Balance, at the end of the period	$ 2,070	$ 2,070	$ 2,070	$ 2,070