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, 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 (loss)	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 to noncontrolling interests	(123)											(123)
Stock-based compensation	(60)	(44)	(1)					(59)	(44)	(60)
Noncash stock-based compensation	22	9	22		9				0	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 (loss)	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 to noncontrolling interests	(124)											(124)
Stock-based compensation	(179)	(38)						(179)	(38)	(179)
Noncash stock-based compensation	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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(313)	(189)						(423)	(189)	(423)	(11)	121
Other comprehensive income (loss)	(2)	1				(2)	1			(2)
Other comprehensive income (loss)	(7)	(4)
Contribution from tax equity investor	24										24
Dividends declared on common stock	(791)	(576)						(791)	(576)	(791)
Dividends declared on preferred and preference stock		(121)							(121)
Dividends to noncontrolling interests	(121)											(121)
Stock-based compensation	(20)	(11)						(20)	(11)	(20)
Noncash stock-based compensation	19	9	19		9					19
Deconsolidation of SoCore Energy	(15)										(15)
Balance, at the end of the period at Dec. 31, 2018	$ 12,652	$ 13,785	$ 2,545	$ 2,168	$ 680	$ (50)	$ (23)	$ 7,964	$ 8,715	$ 10,459	$ 0	$ 2,193	$ 2,245