Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	$ 15,544	$ 15,496	$ 12,719	$ 12,652
Net income	348	213	422	308
Other comprehensive income	2	2	1	2
Common stock issued, net of issuance cost	815	88
Common stock dividends declared	(241)	(232)	(200)	(200)
Dividends to noncontrolling interests	(30)	(30)	(30)	(30)
Stock-based compensation			(4)	(18)
Noncash stock-based compensation	8	7	5	5
Balance, at the end of the period	$ 16,446	$ 15,544	$ 12,913	$ 12,719
Dividends declared per common share (in dollars per share)	$ 0.6375	$ 0.6375	$ 0.6125	$ 0.6125
Accounting Standards Update [Extensible List]				us-gaap:AccountingStandardsUpdate201802Member
Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period				$ 0
Minimum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock, dividends per share, declared (in dollars per share)	0.255	0.255	0.255	$ 0.255
Preference stock, dividends per share, declared (in dollars per share)	15.625	15.625	15.625	15.625
Maximum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock, dividends per share, declared (in dollars per share)	0.299	0.299	0.299	0.299
Preference stock, dividends per share, declared (in dollars per share)	$ 35.936	$ 35.936	$ 35.936	$ 35.936
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	$ 5,085	$ 4,990	$ 2,550	$ 2,545
Common stock issued, net of issuance cost	815	88
Noncash stock-based compensation	8	7	5	5
Balance, at the end of the period	5,908	5,085	2,555	2,550
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	(67)	(69)	(58)	(50)
Other comprehensive income	2	2	1	2
Balance, at the end of the period	(65)	(67)	(57)	(58)
Accumulated Other Comprehensive Loss | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period				(10)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	8,333	8,382	8,034	7,964
Net income	318	183	392	278
Common stock dividends declared	(241)	(232)	(200)	(200)
Stock-based compensation			(4)	(18)
Balance, at the end of the period	8,410	8,333	8,222	8,034
Retained Earnings | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period				10
Subtotal
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	13,351	13,303	10,526	10,459
Net income	318	183	392	278
Other comprehensive income	2	2	1	2
Common stock issued, net of issuance cost	815	88
Common stock dividends declared	(241)	(232)	(200)	(200)
Stock-based compensation			(4)	(18)
Noncash stock-based compensation	8	7	5	5
Balance, at the end of the period	14,253	13,351	10,720	10,526
Noncontrolling Interests, Preferred and Preference Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	2,193	2,193	2,193	2,193
Net income	30	30	30	30
Dividends to noncontrolling interests	(30)	(30)	(30)	(30)
Balance, at the end of the period	2,193	2,193	2,193	2,193
Southern California Edison
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	18,046	17,827	13,870	13,785
Net income	411	249	449	323
Other comprehensive income	1	2	1	1
Capital contribution from Edison International Parent	619	269	1,200
Common stock dividends declared	(269)	(269)		(200)
Dividends declared on preferred and preference stock	(30)	(30)	(30)	(30)
Stock-based compensation		(5)	(1)	(12)
Noncash stock-based compensation	3	3	3	3
Balance, at the end of the period	$ 18,781	$ 18,046	$ 15,492	$ 13,870
Dividends declared per common share (in dollars per share)	$ 0.6185	$ 0.6185		$ 0.4599
Accounting Standards Update [Extensible List]				us-gaap:AccountingStandardsUpdate201802Member
Southern California Edison | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period				$ 0
Southern California Edison | Minimum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock, dividends per share, declared (in dollars per share)	0.255	0.255	$ 0.255	$ 0.255
Preference stock, dividends per share, declared (in dollars per share)	15.625	15.625	15.625	15.625
Southern California Edison | Maximum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock, dividends per share, declared (in dollars per share)	0.299	0.299	0.299	0.299
Preference stock, dividends per share, declared (in dollars per share)	$ 35.936	$ 35.936	$ 35.936	$ 35.936
Southern California Edison | Preferred and Preference Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	$ 2,245	$ 2,245	$ 2,245	$ 2,245
Balance, at the end of the period	2,245	2,245	2,245	2,245
Southern California Edison | Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	2,168	2,168	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	4,207	3,939	683	680
Capital contribution from Edison International Parent	619	269	1,200
Stock-based compensation		(5)
Noncash stock-based compensation	3	4	3	3
Balance, at the end of the period	4,829	4,207	1,886	683
Southern California Edison | Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	(37)	(39)	(27)	(23)
Other comprehensive income	1	2	1	1
Balance, at the end of the period	(36)	(37)	(26)	(27)
Southern California Edison | Accumulated Other Comprehensive Loss | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period				(5)
Southern California Edison | Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period	9,463	9,514	8,801	8,715
Net income	411	249	449	323
Common stock dividends declared	(269)	(269)		(200)
Dividends declared on preferred and preference stock	(30)	(30)	(30)	(30)
Stock-based compensation			(1)	(12)
Noncash stock-based compensation		(1)
Balance, at the end of the period	$ 9,575	$ 9,463	$ 9,219	8,801
Southern California Edison | Retained Earnings | Cumulative effect adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, at the beginning of the period				$ 5