Schedule I - Condensed Financial Information of Parent (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets:
Cash and cash equivalents	$ 193	$ 345
Other current assets	418	341
Total current assets	7,155	6,811
Other long-term assets	2,403	2,062
Total assets	85,579	81,758
Liabilities and equity:
Short-term debt	998	1,077
Current portion of long-term debt	2,049	2,697
Other current liabilities	1,439	1,538
Total current liabilities	8,439	8,598
Long-term debt (include $1,468 and $1,515 related to a VIE at respective dates)	33,534	30,316
Other long-term liabilities	3,566	3,258
Total equity	17,740	17,944	$ 17,522	$ 17,789
Total liabilities and equity	85,579	81,758
Condensed Statements of Income:
Interest income	17,599	16,338	17,220
Operating, interest and other expenses	14,669	13,711	15,737
Operating income	2,930	2,627	1,483
Income before income taxes	1,563	1,515	662
Income tax expense (benefit)	17	108	(162)
Net income	1,546	1,407	824
Preferred stock dividend requirements of Edison International	87	87	105
Net income available to Edison International common shareholders	1,284	1,197	612
Condensed Statements of Comprehensive Income
Net income	1,546	1,407	824
Other comprehensive income, net of tax	9	2	43
Comprehensive income attributable to Edison International	1,380	1,286	760
Condensed Statements of Cash Flows:
Net cash provided by operating activities	5,014	3,401	3,216
Cash flows from financing activities:
Long-term debt issued	5,256	5,121	5,971
Long-term debt repaid	(2,701)	(2,498)	(1,085)
Short-term debt issued	0	1,076	1,000
Short-term debt repaid	(401)	(2,407)	(1,543)
Common stock repurchased	(200)	0	0
Preferred and preference stock issued, net of issuance cost	345	542	0
Preferred and preference stock repurchased and redeemed	(656)	(289)	0
Commercial paper borrowing (repayments), net	308	1,102	(317)
Common stock dividends paid	(1,198)	(1,112)	(1,050)
Preferred stock dividends paid	(88)	(108)	(99)
Net cash provided by financing activities	674	1,447	2,881
Cash flows from investing activities:
Net cash used in investing activities	(5,536)	(5,233)	(5,574)
Net increase (decrease) in cash, cash equivalents and restricted cash	152	(385)	523
Cash, cash equivalents and restricted cash at beginning of year	532	917	394
Cash, cash equivalents and restricted cash at end of year	684	532	917
Commitment	4,850
Amount available	3,139
Parent Company
Assets:
Cash and cash equivalents	4	1
Other current assets	606	441
Total current assets	610	442
Investments in subsidiaries	20,630	20,026
Deferred income taxes	760	700
Other long-term assets	67	58
Total assets	22,067	21,226
Liabilities and equity:
Short-term debt	445	246
Current portion of long-term debt	800	500
Other current liabilities	639	598
Total current liabilities	1,884	1,344
Long-term debt (include $1,468 and $1,515 related to a VIE at respective dates)	4,268	4,019
Other long-term liabilities	350	362
Total equity	15,565	15,501
Total liabilities and equity	22,067	21,226
Condensed Statements of Income:
Interest income	3	2	3
Operating, interest and other expenses	342	299	209
Operating income	(339)	(297)	(206)
Equity in earnings of subsidiaries	1,610	1,498	867
Income before income taxes	1,271	1,201	661
Income tax expense (benefit)	(100)	(83)	(56)
Net income	1,371	1,284	717
Preferred stock dividend requirements of Edison International	87	87	105
Net income available to Edison International common shareholders	1,284	1,197	612
Condensed Statements of Comprehensive Income
Net income	1,371	1,284	717
Other comprehensive income, net of tax	9	2	43
Comprehensive income attributable to Edison International	1,380	1,286	760
Condensed Statements of Cash Flows:
Net cash provided by operating activities	1,097	1,148	1,133
Cash flows from financing activities:
Long-term debt issued	1,049	1,549	945
Long-term debt issuance costs	(7)	(16)	6
Long-term debt repaid	(500)	(400)	700
Short-term debt issued	0	370	1,000
Short-term debt repaid	(15)	1,356	0
Common stock issued	12	20	13
Preferred and preference stock repurchased and redeemed	(28)	289	0
Payable due to affiliates	0	(3)	(14)
Commercial paper borrowing (repayments), net	214	139	89
Payments for stock-based compensation	(24)	(5)	(8)
Receipts for stock-based compensation	206	71	72
Common stock dividends paid	(1,198)	(1,112)	(1,050)
Preferred stock dividends paid	(88)	(108)	(99)
Net cash provided by financing activities	(579)	(1,140)	242
Cash flows from investing activities:
Capital contributions to affiliate	(516)	(15)	(1,426)
Dividends from affiliate	1	4	3
Net cash used in investing activities	(515)	(11)	(1,423)
Net increase (decrease) in cash, cash equivalents and restricted cash	3	(3)	(48)
Cash, cash equivalents and restricted cash at beginning of year	1	4	52
Cash, cash equivalents and restricted cash at end of year	$ 4	$ 1	$ 4