Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			$ 12,982	$ 11,691
Net income			1,183	1,276
Other comprehensive income (loss)	$ 1	$ (10)	3	(10)
Common stock dividends declared			(408)	(347)
Dividends to noncontrolling interests			(84)	(84)
Stock-based compensation			(67)	(57)
Non-cash stock-based compensation			17	20
Issuance of preference stock			319	269
Redemption of preference stock			(325)
Balance, at the end of the period	$ 13,620	$ 12,758	$ 13,620	$ 12,758
Dividends declared per common share (in dollars per share)	$ 0.4175	$ 0.3550	$ 1.2525	$ 1.065
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	0
Common stock dividends declared			0	0
Dividends to noncontrolling interests			0	0
Stock-based compensation			13	22
Non-cash stock-based compensation			17	20
Issuance of preference stock			0	0
Redemption of preference stock			0
Balance, at the end of the period	$ 2,475	$ 2,445	2,475	2,445
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)			3	(10)
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	0
Redemption of preference stock			0
Balance, at the end of the period	(55)	(23)	(55)	(23)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			8,573	7,548
Net income			1,099	1,192
Other comprehensive income (loss)			0	0
Common stock dividends declared			(408)	(347)
Dividends to noncontrolling interests			0	0
Stock-based compensation			(80)	(79)
Non-cash stock-based compensation			0	0
Issuance of preference stock			0	0
Redemption of preference stock			(4)
Balance, at the end of the period	9,180	8,314	9,180	8,314
Subtotal
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			10,960	9,938
Net income			1,099	1,192
Other comprehensive income (loss)			3	(10)
Common stock dividends declared			(408)	(347)
Dividends to noncontrolling interests			0	0
Stock-based compensation			(67)	(57)
Non-cash stock-based compensation			17	20
Issuance of preference stock			0	0
Redemption of preference stock			(4)
Balance, at the end of the period	11,600	10,736	11,600	10,736
Preferred and preference stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,022	1,753
Net income			84	84
Other comprehensive income (loss)			0	0
Common stock dividends declared			0	0
Dividends to noncontrolling interests			(84)	(84)
Stock-based compensation			0	0
Non-cash stock-based compensation			0	0
Issuance of preference stock			319	269
Redemption of preference stock			(321)
Balance, at the end of the period	2,020	2,022	2,020	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			1,163	1,156
Other comprehensive income (loss)	1	0	3	3
Common stock dividends declared			(441)	(378)
Dividends declared on preferred and preference stock			(84)	(84)
Stock-based compensation			(3)	(34)
Non-cash stock-based compensation			10	5
Issuance of preference stock			319	269
Redemption of preference stock			(325)
Balance, at the end of the period	13,924	13,075	13,924	13,075
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	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			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			28	13
Non-cash stock-based compensation			10	9
Issuance of preference stock			(6)	(6)
Redemption of preference stock			4
Balance, at the end of the period	654	608	654	608
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)			3	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	0
Redemption of preference stock			0
Balance, at the end of the period	(25)	(8)	(25)	(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			1,163	1,156
Other comprehensive income (loss)			0	0
Common stock dividends declared			(441)	(378)
Dividends declared on preferred and preference stock			(84)	(84)
Stock-based compensation			(31)	(47)
Non-cash stock-based compensation			0	(4)
Issuance of preference stock			0	0
Redemption of preference stock			(4)
Balance, at the end of the period	9,057	8,237	9,057	8,237
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			325	275
Redemption of preference stock			(325)
Balance, at the end of the period	$ 2,070	$ 2,070	$ 2,070	$ 2,070