Consolidated Statements of Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 17,313	$ 17,223	$ 15,949	$ 16,446	$ 15,544	$ 15,496
Net (loss) income	(297)	361	290	(242)	348	213
Other comprehensive income	2	2	2	2	2	2
Common stock issued, net of issuance cost	10	14	21	15	815	88
Preferred stock issued, net of issuance cost		(2)	1,237
Common stock dividends declared	(252)	(252)	(251)	(241)	(241)	(232)
Preferred stock dividend accrued	(17)	(17)	(4)
Dividends to noncontrolling interests	(27)	(26)	(27)	(31)	(30)	(30)
Noncash stock-based compensation	10	10	6	8	8	7
Redemption of preferred and preference stock				(308)
Ending balance	$ 16,742	$ 17,313	$ 17,223	$ 15,649	$ 16,446	$ 15,544
Dividends declared per common share (in dollars per share)	$ 0.6625	$ 0.6625	$ 0.6625	$ 0.6375	$ 0.6375	$ 0.6375
Preferred stock dividends (in dollars per share)	13.4375	13.2882	3.434
Minimum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock dividends (in dollars per share)				0.247	0.255	0.255
Preference stock dividends (in dollars per share)	15.625	15.625	15.625	15.625	15.625	15.625
Maximum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock dividends (in dollars per share)				0.289	0.299	0.299
Preference stock dividends (in dollars per share)	$ 35.936	$ 35.936	$ 35.936	$ 35.936	$ 35.936	$ 35.936
Preferred and preference stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,235	$ 1,237
Preferred stock issued, net of issuance cost		(2)	$ 1,237
Ending balance	1,235	1,235	1,237
Common Stock, Including APIC
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	6,013	5,989	5,962	$ 5,908	$ 5,085	$ 4,990
Common stock issued, net of issuance cost	10	14	21	15	815	88
Noncash stock-based compensation	10	10	6	7	8	7
Ending balance	6,033	6,013	5,989	5,930	5,908	5,085
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(65)	(67)	(69)	(65)	(67)	(69)
Other comprehensive income	2	2	2	2	2	2
Ending balance	(63)	(65)	(67)	(63)	(65)	(67)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	8,229	8,163	8,155	8,410	8,333	8,382
Net (loss) income	(324)	335	263	(288)	318	183
Common stock dividends declared	(252)	(252)	(251)	(241)	(241)	(232)
Preferred stock dividend accrued	(17)	(17)	(4)
Ending balance	7,636	8,229	8,163	7,881	8,410	8,333
Equity Attributable to Common Shareholders
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	15,412	15,322	14,048	14,253	13,351	13,303
Net (loss) income	(324)	335	263	(288)	318	183
Other comprehensive income	2	2	2	2	2	2
Common stock issued, net of issuance cost	10	14	21	15	815	88
Preferred stock issued, net of issuance cost		(2)	1,237
Common stock dividends declared	(252)	(252)	(251)	(241)	(241)	(232)
Preferred stock dividend accrued	(17)	(17)	(4)
Noncash stock-based compensation	10	10	6	7	8	7
Ending balance	14,841	15,412	15,322	13,748	14,253	13,351
Noncontrolling Interest, Preferred and Preference Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,901	1,901	1,901	2,193	2,193	2,193
Net (loss) income	27	26	27	46	30	30
Dividends to noncontrolling interests	(27)	(26)	(27)	(31)	(30)	(30)
Noncash stock-based compensation				1
Redemption of preferred and preference stock				(308)
Ending balance	1,901	1,901	1,901	1,901	2,193	2,193
SCE
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	19,887	19,522	18,650	18,781	18,046	17,827
Net (loss) income	(257)
Net (loss) income		385	323	(218)	411	249
Other comprehensive income	2	1	2	1	1	2
Capital contribution from Edison International Parent	83	325	900	219	619	269
Common stock dividends declared	(325)	(325)	(325)	(269)	(269)	(269)
Dividends declared on preferred and preference stock	(27)	(26)	(27)	(31)	(30)	(30)
Stock-based compensation			(4)			(5)
Noncash stock-based compensation	5	5	3	4	3	3
Redemption of preferred and preference stock				(308)
Ending balance	$ 19,368	$ 19,887	$ 19,522	$ 18,179	$ 18,781	$ 18,046
Dividends declared per common share (in dollars per share)	$ 0.7473	$ 0.7473	$ 0.7473	$ 0.6185	$ 0.6185	$ 0.6185
SCE \| Minimum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock dividends (in dollars per share)				0.247	0.255	0.255
Preference stock dividends (in dollars per share)	15.625	15.625	15.625	15.625	15.625	15.625
SCE \| Maximum
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock dividends (in dollars per share)				0.289	0.299	0.299
Preference stock dividends (in dollars per share)	$ 35.936	$ 35.936	$ 35.936	$ 35.936	$ 35.936	$ 35.936
SCE \| Preferred and preference stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,945	$ 1,945	$ 1,945	$ 2,245	$ 2,245	$ 2,245
Redemption of preferred and preference stock				(300)
Ending balance	1,945	1,945	1,945	1,945	2,245	2,245
SCE \| Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,168	2,168	2,168	2,168	2,168	2,168
Ending balance	2,168	2,168	2,168	2,168	2,168	2,168
SCE \| Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	6,616	6,286	5,387	4,829	4,207	3,939
Capital contribution from Edison International Parent	83	325	900	219	619	269
Stock-based compensation			(4)			(5)
Noncash stock-based compensation	5	5	3	3	3	4
Redemption of preferred and preference stock				7
Ending balance	6,704	6,616	6,286	5,058	4,829	4,207
SCE \| Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(38)	(39)	(41)	(36)	(37)	(39)
Other comprehensive income	2	1	2	1	1	2
Ending balance	(36)	(38)	(39)	(35)	(36)	(37)
SCE \| Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	9,196	9,162	9,191	9,575	9,463	9,514
Net (loss) income	(257)
Net (loss) income		385	323	(218)	411	249
Common stock dividends declared	(325)	(325)	(325)	(269)	(269)	(269)
Dividends declared on preferred and preference stock	(27)	(26)	(27)	(31)	(30)	(30)
Noncash stock-based compensation				1		(1)
Redemption of preferred and preference stock				(15)
Ending balance	$ 8,587	$ 9,196	$ 9,162	$ 9,043	$ 9,575	$ 9,463

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