Schedule I - Condensed Financial Information of Parent (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets:
Cash and cash equivalents	$ 390	$ 87
Other current assets	249	292
Total current assets	5,491	5,061
Other long-term assets	1,485	860
Total assets	74,745	69,372
Liabilities and equity:
Short-term debt	2,354	2,398
Current portion of long-term debt	1,077	1,029
Other current liabilities	1,667	1,612
Total current liabilities	8,609	10,277
Long-term debt	24,170	19,632
Other long-term liabilities	3,105	2,910
Total equity	17,789	15,949	$ 15,496	$ 12,652
Total liabilities and equity	74,745	69,372
Condensed Statements of Income:
Interest income from affiliates	14,905	13,578	12,347
Operating, interest and other expenses	13,428	12,361	10,572
Operating income	1,477	1,217	1,775
Income before income taxes	789	566	1,127
Income tax (benefit) expense	(136)	(305)	(278)
Net income	925	871	1,405
Preferred stock dividend requirement of Edison International	60
Net income available to common shareholders	759	739	1,284
Condensed Statements of Comprehensive Income
Net income	925	871	1,405
Other comprehensive income, net of tax	15		(9)
Comprehensive income attributable to Edison International	834	739	1,275
Condensed Statements of Cash Flows:
Net cash provided by operating activities	11	1,263	(307)
Cash flows from financing activities:
Long-term debt issued	5,412	3,073	3,696
Long-term debt repaid	(1,037)	(1,099)	(82)
Short-term debt issued	2,654	2,994	1,750
Short-term debt repaid	(2,255)	(1,126)	(1,750)
Common stock issued	32	912	2,391
Preferred stock issued, net	1,977
Commercial paper (repayments) borrowing, net	(254)	304	(172)
Common stock dividends paid	(988)	(928)	(810)
Preferred stock dividends paid	(35)
Net cash provided by financing activities	5,445	3,727	4,903
Net cash used in investing activities	(5,151)	(4,971)	(4,678)
Net increase (decrease) in cash, cash equivalents and restricted cash	305	19	(82)
Cash, cash equivalents and restricted cash at beginning of year	89	70	152
Cash, cash equivalents and restricted cash at end of year	394	89	70
Edison International
Assets:
Cash and cash equivalents	52	3
Other current assets	403	43
Total current assets	455	46
Investments in subsidiaries	18,924	17,706
Deferred income taxes	697	675
Other long-term assets	68	71
Total assets	20,144	18,498
Liabilities and equity:
Short-term debt		129
Current portion of long-term debt	700	0
Other current liabilities	583	636
Total current liabilities	1,283	765
Long-term debt	2,438	3,133
Other long-term liabilities	535	552
Total equity	15,888	14,048
Total liabilities and equity	20,144	18,498
Condensed Statements of Income:
Interest income from affiliates	0	1	5
Operating, interest and other expenses	176	189	150
Operating income	(176)	(188)	(145)
Equity in earnings (loss) of subsidiaries	956	851	1,385
Income before income taxes	780	663	1,240
Income tax (benefit) expense	(39)	(76)	(44)
Net income	819	739	1,284
Preferred stock dividend requirement of Edison International	60	0	0
Net income available to common shareholders	759	739	1,284
Condensed Statements of Comprehensive Income
Net income	819	739	1,284
Other comprehensive income, net of tax	15		(9)
Comprehensive income attributable to Edison International	834	739	1,275
Condensed Statements of Cash Flows:
Net cash provided by operating activities	817	1,171	181
Cash flows from financing activities:
Long-term debt issued	0	400	1,399
Long-term debt issuance costs	0	(3)	(9)
Long-term debt repaid	0	(400)	0
Short-term debt issued	0	800	1,000
Short-term debt repaid	0	(800)	(1,000)
Common stock issued	32	912	2,391
Preferred stock issued, net	1,977	0	0
Payable due to affiliates	(13)	135	5
Commercial paper (repayments) borrowing, net	(130)	129	(1)
Payments for stock-based compensation	(3)	(3)	(27)
Receipts from stock-based compensation	31	21	39
Common stock dividends paid	(988)	(928)	(810)
Preferred stock dividends paid	(35)	0	0
Net cash provided by financing activities	871	263	2,987
Capital contributions to affiliate	(1,639)	(1,446)	(3,258)
Dividends from affiliate	0	0	8
Net cash used in investing activities	(1,639)	(1,446)	(3,250)
Net increase (decrease) in cash, cash equivalents and restricted cash	49	(12)	(82)
Cash, cash equivalents and restricted cash at beginning of year	3	15	97
Cash, cash equivalents and restricted cash at end of year	$ 52	$ 3	$ 15