Consolidated Statements of Changes in Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	$ 11,691	$ 11,191
Net income	202	298
Other comprehensive income (loss)	2	0
Common stock dividends declared	(116)	(110)
Dividends, distributions to noncontrolling interests and other	(26)	(27)
Stock-based compensation and other	(41)	(32)
Noncash stock-based compensation and other	20	2
Issuance of preference stock	270	387
Redemption of preference stock		(400)
Balance, at the end of the period	12,002	11,309
Dividends declared per common share (in dollars per share)	$ 0.355	$ 0.3375
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
Common stock dividends declared	0	0
Dividends, distributions to noncontrolling interests and other	0	0
Stock-based compensation and other	9	1
Noncash stock-based compensation and other	5	6
Issuance of preference stock	0	0
Redemption of preference stock		0
Balance, at the end of the period	2,417	2,380
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)	2
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	(11)	(87)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	7,548	7,146
Net income	176	271
Other comprehensive income (loss)	0
Common stock dividends declared	(116)	(110)
Dividends, distributions to noncontrolling interests and other	0	0
Stock-based compensation and other	(50)	(33)
Noncash stock-based compensation and other	15	(4)
Issuance of preference stock	0	0
Redemption of preference stock		(8)
Balance, at the end of the period	7,573	7,262
Subtotal
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	9,938	9,432
Net income	176	271
Other comprehensive income (loss)	2
Common stock dividends declared	(116)	(110)
Dividends, distributions to noncontrolling interests and other	0	0
Stock-based compensation and other	(41)	(32)
Noncash stock-based compensation and other	20	2
Issuance of preference stock	0	0
Redemption of preference stock		(8)
Balance, at the end of the period	9,979	9,555
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	26	27
Other comprehensive income (loss)	0
Common stock dividends declared	0	0
Dividends, distributions to noncontrolling interests and other	(26)	(27)
Stock-based compensation and other	0	0
Noncash stock-based compensation and other	0	0
Issuance of preference stock	270	387
Redemption of preference stock		(392)
Balance, at the end of the period	2,023	1,754
Southern California Edison
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	12,138	11,743
Net income	234	283
Other comprehensive income (loss)	1	(3)
Common stock dividends declared	(126)	(120)
Dividends on preferred and preference stock	(26)	(27)
Stock-based compensation and other	(22)	(29)
Noncash stock-based compensation and other	12	8
Issuance of preference stock	270	387
Redemption of preference stock		(400)
Balance, at the end of the period	12,481	11,842
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
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	9	0
Noncash stock-based compensation and other	2	3
Issuance of preference stock	(5)	(13)
Redemption of preference stock		8
Balance, at the end of the period	598	579
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)	1	(3)
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	(10)	(32)
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	234	283
Other comprehensive income (loss)	0	0
Common stock dividends declared	(126)	(120)
Dividends on preferred and preference stock	(26)	(27)
Stock-based compensation and other	(31)	(29)
Noncash stock-based compensation and other	10	5
Issuance of preference stock	0	0
Redemption of preference stock		(8)
Balance, at the end of the period	7,655	7,332
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