Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	SCE	Cumulative effect of accounting changes	Cumulative effect of accounting changes SCE	Common Stock	Preference stock SCE	Common Stock SCE	Additional Paid-in Capital SCE	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss SCE	Accumulated Other Comprehensive Loss Cumulative effect of accounting changes	Accumulated Other Comprehensive Loss Cumulative effect of accounting changes SCE	Retained Earnings	Retained Earnings SCE	Retained Earnings Cumulative effect of accounting changes	Retained Earnings Cumulative effect of accounting changes SCE	Equity Attributable to Common Shareholders	Equity Attributable to Common Shareholders Cumulative effect of accounting changes	Other	Noncontrolling Interest, Preferred and Preference Stock
Beginning balance at Dec. 31, 2017	$ 13,866	$ 14,672	$ 5	$ 0	$ 2,526	$ 2,245	$ 2,168	$ 671	$ (43)	$ (19)	$ (5)	$ (5)	$ 9,188	$ 9,607	$ 10	$ 5	$ 11,671	$ 5	$ 2	$ 2,193
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(189)												(189)
Net loss (income)	(313)												(423)				(423)		(11)	121
Other comprehensive income (loss)	(2)	1							(2)	1							(2)
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)
Ending balance at Dec. 31, 2018	12,652	13,785	$ 0	$ 0	2,545	2,245	2,168	680	(50)	(23)	$ (10)	$ (5)	7,964	8,715	$ 10	$ 5	10,459		0	2,193
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		1,530												1,530
Net loss (income)	1,405												1,284				1,284			121
Other comprehensive income (loss)	(9)	(11)							(9)	(11)							(9)
Capital contribution from Edison International Parent		3,250						3,250
Issuance of preference or common stock	2,421				2,421												2,421
Dividends declared on common stock	(849)	(600)											(849)	(600)			(849)
Dividends declared on preferred and preference stock		(121)												(121)
Dividends to noncontrolling interests	(121)																			(121)
Stock-based compensation	(27)	(18)						(3)					(27)	(15)			(27)
Noncash stock-based compensation	24	12			24			12									24
Ending balance at Dec. 31, 2019	15,496	17,827			4,990	2,245	2,168	3,939	(69)	(39)			8,382	9,514			13,303		0	2,193
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		942												942
Net loss (income)	871												739				739			132
Other comprehensive income (loss)		(2)								(2)
Capital contribution from Edison International Parent		1,432						1,432
Issuance of preference or common stock	942				942												942
Dividends declared on common stock	(965)	(1,132)											(965)	(1,132)			(965)
Dividends declared on preferred and preference stock		(117)												(117)
Dividends to noncontrolling interests	(117)																			(117)
Stock-based compensation		(5)						(5)
Noncash stock-based compensation	30	13			30			14					(1)	(1)			29			1
Redemption of preference stock	(308)	(308)				(300)		7						(15)						(308)
Ending balance at Dec. 31, 2020	$ 15,949	$ 18,650			$ 5,962	$ 1,945	$ 2,168	$ 5,387	$ (69)	$ (41)			$ 8,155	$ 9,191			$ 14,048		$ 0	$ 1,901