Schedule I - Condensed Financial Information of Parent (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets:
Cash and cash equivalents	$ 345	$ 914
Other current assets	341	397
Total current assets	6,811	7,070
Other long-term assets	2,066	1,239
Total assets	81,758	78,041
Liabilities and equity:
Short-term debt	1,077	2,015
Current portion of long-term debt	2,697	2,614
Other current liabilities	1,751	1,601
Total current liabilities	8,598	10,347
Long-term debt	30,316	27,025
Other long-term liabilities	3,258	2,988
Total equity	17,944	17,522	$ 17,789	$ 15,949
Total liabilities and equity	81,758	78,041
Condensed Statements of Income:
Interest income from affiliates	16,338	17,220	14,905
Operating, interest and other expenses	13,711	15,737	13,428
Operating income	2,627	1,483	1,477
Income before income taxes	1,515	662	789
Income tax expense (benefit)	108	(162)	(136)
Net income	1,407	824	925
Preferred stock dividend requirements of Edison International	87	105	60
Net income available for common stock	1,197	612	759
Condensed Statements of Comprehensive Income
Net income	1,407	824	925
Other comprehensive income, net of tax	2	43	15
Comprehensive income attributable to Edison International	1,286	760	834
Condensed Statements of Cash Flows:
Net cash provided by operating activities	3,401	3,216	11
Cash flows from financing activities:
Long-term debt issued	5,121	5,971	5,412
Long-term debt repaid	(2,498)	(1,085)	(1,037)
Short-term debt issued	1,076	1,000	2,654
Short-term debt repaid	(2,407)	(1,543)	(2,255)
Common stock issued	20	13	32
Preferred and preference stock issued, net of issuance cost	542		1,977
Preferred stock repurchased	(289)
Commercial paper borrowing (repayments), net	1,102	(317)	(254)
Common stock dividends paid	(1,112)	(1,050)	(988)
Preferred stock dividends paid	(108)	(99)	(35)
Net cash provided by financing activities	1,447	2,881	5,445
Cash flows from investing activities:
Net cash used in investing activities	(5,233)	(5,574)	(5,151)
Net (decrease) increase in cash, cash equivalents and restricted cash	(385)	523	305
Cash, cash equivalents and restricted cash at beginning of year	917	394	89
Cash, cash equivalents and restricted cash at end of year	532	917	394
Edison International
Assets:
Cash and cash equivalents	1	4
Other current assets	441	447
Total current assets	442	451
Investments in subsidiaries	20,026	19,922
Deferred income taxes	700	626
Other long-term assets	58	62
Total assets	21,226	21,061
Liabilities and equity:
Short-term debt	246	1,090
Current portion of long-term debt	500	400
Other current liabilities	598	575
Total current liabilities	1,344	2,065
Long-term debt	4,019	2,981
Other long-term liabilities	362	394
Total equity	15,501	15,621
Total liabilities and equity	21,226	21,061
Condensed Statements of Income:
Interest income from affiliates	2	3	0
Operating, interest and other expenses	299	209	176
Operating income	(297)	(206)	(176)
Equity in earnings of subsidiaries	1,498	867	956
Income before income taxes	1,201	661	780
Income tax expense (benefit)	(83)	(56)	(39)
Net income	1,284	717	819
Preferred stock dividend requirements of Edison International	87	105	60
Net income available for common stock	1,197	612	759
Condensed Statements of Comprehensive Income
Net income	1,284	717	819
Other comprehensive income, net of tax	2	43	15
Comprehensive income attributable to Edison International	1,286	760	834
Condensed Statements of Cash Flows:
Net cash provided by operating activities	1,148	1,133	817
Cash flows from financing activities:
Long-term debt issued	1,549	945	0
Long-term debt issuance costs	(16)	(6)	0
Long-term debt repaid	(400)	(700)	0
Short-term debt issued	370	1,000	0
Short-term debt repaid	(1,356)	0	0
Common stock issued	20	13	32
Preferred and preference stock issued, net of issuance cost	0	0	1,977
Preferred stock repurchased	(289)	0	0
Payable due to affiliates	(3)	(14)	(13)
Commercial paper borrowing (repayments), net	139	89	(130)
Payments for stock-based compensation	(5)	(8)	(3)
Receipts from stock-based compensation	71	72	31
Common stock dividends paid	(1,112)	(1,050)	(988)
Preferred stock dividends paid	(108)	(99)	(35)
Net cash provided by financing activities	(1,140)	242	871
Cash flows from investing activities:
Capital contributions to affiliate	(15)	(1,426)	(1,639)
Dividends from affiliate	4	3	0
Net cash used in investing activities	(11)	(1,423)	(1,639)
Net (decrease) increase in cash, cash equivalents and restricted cash	(3)	(48)	49
Cash, cash equivalents and restricted cash at beginning of year	4	52	3
Cash, cash equivalents and restricted cash at end of year	$ 1	$ 4	$ 52