Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Southern California Edison Company	Common Stock	Common Stock Southern California Edison Company	Additional Paid-in Capital Southern California Edison Company	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Southern California Edison Company	Retained Earnings	Retained Earnings Southern California Edison Company	Equity Attributable to Common Shareholders	Other	Preferred and Preference Stock	Preferred and Preference Stock Southern California Edison Company
Balance, at the beginning of the period at Dec. 31, 2014	$ 12,982	$ 13,282	$ 2,445	$ 2,168	$ 618	$ (58)	$ (28)	$ 8,573	$ 8,454	$ 10,960	$ 0	$ 2,022	$ 2,070
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,133	1,111						1,020	1,111	1,020		113
Other comprehensive income (loss)	2	6				2	6			2
Dividends declared on common stock	(564)	(611)						(564)	(611)	(564)
Dividends declared on preferred and preference stock		(113)							(113)
Dividends and distributions to noncontrolling interests and other	(113)											(113)
Stock-based compensation and other	(70)	(10)	15		23			(85)	(33)	(70)
Noncash stock-based compensation and other	24	13	24		13				0	24
Issuance of preference stock	319	319			(6)							319	325
Redemption of preference stock	(325)	(325)			4			(4)	(4)	(4)		(321)	(325)
Balance, at the end of the period at Dec. 31, 2015	13,388	13,672	2,484	2,168	652	(56)	(22)	8,940	8,804	11,368	0	2,020	2,070
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,434	1,499						1,311	1,499	1,311		123
Other comprehensive income (loss)	3	2				3	2			3
Dividends declared on common stock	(646)	(701)						(646)	(701)	(646)
Dividends declared on preferred and preference stock		(123)							(123)
Dividends and distributions to noncontrolling interests and other	(123)											(123)
Stock-based compensation and other	(60)	(44)	(1)					(59)	(44)	(60)
Noncash stock-based compensation and other	22	9	22		9					22
Issuance of preference stock	294	294			(6)							294	300
Redemption of preference stock	(125)	(125)			2			(2)	(2)	(2)		(123)	(125)
Balance, at the end of the period at Dec. 31, 2016	14,187	14,483	2,505	2,168	657	(53)	(20)	9,544	9,433	11,996	0	2,191	2,245
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	671	1,136						565	1,136	565	(18)	124
Other comprehensive income (loss)	10	1				10	1			10
Contribution from tax equity investor	20										20
Dividends declared on common stock	(727)	(785)						(727)	(785)	(727)
Dividends declared on preferred and preference stock		(124)							(124)
Dividends and distributions to noncontrolling interests and other	(124)											(124)
Stock-based compensation and other	(179)	(38)						(179)	(38)	(179)
Noncash stock-based compensation and other	21	12	21		12					21
Issuance of preference stock	462	462			(13)							462	475
Redemption of preference stock	(475)	(475)			15			(15)	(15)	(15)		(460)	(475)
Balance, at the end of the period at Dec. 31, 2017	$ 13,866	$ 14,672	$ 2,526	$ 2,168	$ 671	$ (43)	$ (19)	$ 9,188	$ 9,607	$ 11,671	$ 2	$ 2,193	$ 2,245