Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income			$ 607	$ 734
Net income	$ 304	$ 406	599	724
Net Income (Loss) Attributable to Parent	276	379	546	678
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			13,388	12,982
Other comprehensive income (loss)	1	3	3	2
Dividends declared on common stock			(313)	(272)
Dividends to noncontrolling interests			(61)	(56)
Stock-based compensation			(57)	(55)
Non-cash stock-based compensation			12	12
Issuance of preference stock			294
Redemption of preference stock			(125)
Balance, at the end of the period	$ 13,748	$ 13,347	$ 13,748	$ 13,347
Dividends declared per common share (in dollars per share)	$ 0.4800	$ 0.4175	$ 0.96	$ 0.8350
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			$ 2,484	$ 2,445
Stock-based compensation			3	15
Non-cash stock-based compensation			12	12
Balance, at the end of the period	$ 2,499	$ 2,472	2,499	2,472
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			(56)	(58)
Other comprehensive income (loss)			3	2
Balance, at the end of the period	(53)	(56)	(53)	(56)
Retained Earnings
Net income			546	678
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			8,940	8,573
Dividends declared on common stock			(313)	(272)
Stock-based compensation			(60)	(70)
Redemption of preference stock			(2)
Balance, at the end of the period	9,111	8,909	9,111	8,909
Subtotal
Net income			546	678
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			11,368	10,960
Other comprehensive income (loss)			3	2
Dividends declared on common stock			(313)	(272)
Stock-based compensation			(57)	(55)
Non-cash stock-based compensation			12	12
Redemption of preference stock			(2)
Balance, at the end of the period	11,557	11,325	11,557	11,325
Preferred and preference stock
Net income			61	56
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,020	2,022
Dividends to noncontrolling interests			(61)	(56)
Issuance of preference stock			294
Redemption of preference stock			(123)
Balance, at the end of the period	2,191	2,022	2,191	2,022
Southern California Edison
Net income	346	412	662	745
Net Income (Loss) Attributable to Parent	315	384	601	689
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			13,672	13,282
Other comprehensive income (loss)	1	1	2	2
Dividends declared on common stock			(340)	(294)
Dividends declared on preferred and preference stock			(61)	(56)
Stock-based compensation			(38)	(17)
Non-cash stock-based compensation			6	6
Issuance of preference stock			294
Redemption of preference stock			(125)
Balance, at the end of the period	14,072	13,668	14,072	13,668
Southern California Edison | Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,168	2,168
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			652	618
Stock-based compensation			2	6
Non-cash stock-based compensation			6	6
Issuance of preference stock			(6)
Redemption of preference stock			2
Balance, at the end of the period	656	630	656	630
Southern California Edison | Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			(22)	(28)
Other comprehensive income (loss)			2	2
Balance, at the end of the period	(20)	(26)	(20)	(26)
Southern California Edison | Retained Earnings
Net income			662	745
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			8,804	8,454
Dividends declared on common stock			(340)	(294)
Dividends declared on preferred and preference stock			(61)	(56)
Stock-based compensation			(40)	(23)
Redemption of preference stock			(2)
Balance, at the end of the period	9,023	8,826	9,023	8,826
Southern California Edison | Preferred and preference stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period			2,070	2,070
Issuance of preference stock			300
Redemption of preference stock			(125)
Balance, at the end of the period	$ 2,245	$ 2,070	$ 2,245	$ 2,070