Schedule I - Condensed Financial Information of Parent (Notes) (Details) $ / shares in Units, $ in Millions		3 Months Ended	12 Months Ended
	Jan. 01, 2020	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Apr. 30, 2021 USD ($)	May 31, 2019 USD ($)
Debt and Credit Agreements
Commitment		$ 4,850	$ 4,850
Outstanding borrowings		(601)	(601)
Amount available		$ 4,054	4,054
Equity
Equity contribution			$ 900
Series A
Equity
Stock issued (in shares) | shares			1,250,000
Preferred Stock, dividend rate, (as a percent)			5.375%
Margin rate for dividend rate reset (as a percent)		4.698%	4.698%
Series B
Equity
Stock issued (in shares) | shares			750,000
Preferred Stock, dividend rate, (as a percent)			5.00%
Margin rate for dividend rate reset (as a percent)		3.901%	3.901%
Edison International
Basis of Presentation
Cash dividends received from consolidated subsidiaries			$ 975	$ 1,300	$ 400
Debt and Credit Agreements
Covenant debt to total capitalization ratio		0.70	0.70
Actual debt to capitalization ratio		0.61	0.61
Equity
Proceeds received, net of offering costs			$ 2,000
Equity contribution			900
Related Party Transactions
Expenses from services provided by SCE			2	2	2
Interest expense from loans due to affiliates			5	4	$ 5
Current receivables due from affiliates		$ 361	361	43
Current payables due to affiliates		211	211	323
Long-term receivables due from affiliate		52	52	68
Long-term payables due to affiliates		227	227	219
Edison International | 2.40% Senior notes due 2022
Debt and Credit Agreements
Long-term debt		$ 400	$ 400	$ 400
Interest rate on debt (as a percent)		2.40%	2.40%	2.40%
Edison International | 3.125% Senior notes due 2022
Debt and Credit Agreements
Long-term debt		$ 300	$ 300	$ 300
Interest rate on debt (as a percent)		3.125%	3.125%	3.125%
Edison International | 2.95% Senior notes due 2023
Debt and Credit Agreements
Long-term debt		$ 400	$ 400	$ 400
Interest rate on debt (as a percent)		2.95%	2.95%	2.95%
Edison International | 3.55% Senior note due 2024
Debt and Credit Agreements
Long-term debt		$ 500	$ 500	$ 500
Interest rate on debt (as a percent)		3.55%	3.55%	3.55%
Edison International | 4.95% Senior notes due 2025
Debt and Credit Agreements
Long-term debt		$ 400	$ 400	$ 400
Interest rate on debt (as a percent)		4.95%	4.95%	4.95%
Edison International | 5.75% Senior notes due 2027
Debt and Credit Agreements
Long-term debt		$ 600	$ 600	$ 600
Interest rate on debt (as a percent)		5.75%	5.75%	5.75%
Edison International | 4.125% Senior notes due 2028
Debt and Credit Agreements
Long-term debt		$ 550	$ 550	$ 550
Interest rate on debt (as a percent)		4.125%	4.125%	4.125%
Edison International | Multi-year credit facilities
Debt and Credit Agreements
Commitment		$ 1,500	$ 1,500
Outstanding borrowings		0	0
Amount available		$ 1,500	$ 1,500
Contingent maximum available borrowing							$ 2,000
Edison International | Series A
Equity
Stock issued (in shares) | shares			1,250,000
Preferred Stock, dividend rate, (as a percent)			5.375%
Liquidation value (in dollars per share) | $ / shares		$ 1,000	$ 1,000
Margin rate for dividend rate reset (as a percent)		4.698%	4.698%
Edison International | Series B
Equity
Stock issued (in shares) | shares			750,000
Preferred Stock, dividend rate, (as a percent)			5.00%
Margin rate for dividend rate reset (as a percent)		3.901%	3.901%
At-the-market Program (ATM)
Equity
Aggregate sale price								$ 1,500
Aggregate sales price remaining		$ 1,300	$ 1,300
Stock issued (in shares) | shares			0
At-the-market Program (ATM) | Edison International
Equity
Aggregate sale price								$ 1,500
Aggregate sales price remaining		$ 1,300	$ 1,300
Stock issued (in shares) | shares		0	0
401(K)
Equity
Stock issued (in shares) | shares			522,400	1,644,500
Proceeds received, net of offering costs			$ 30	$ 99
401(K) | Edison International
Equity
Stock issued (in shares) | shares			522,400	1,644,500
Proceeds received, net of offering costs			$ 30	$ 99
In lieu of dividend payment
Equity
Stock issued (in shares) | shares			293,031	280,707
Proceeds received, net of offering costs			$ 17	$ 17
In lieu of dividend payment | Edison International
Equity
Stock issued (in shares) | shares			293,031	280,707
Proceeds received, net of offering costs			$ 17	$ 17
Stock compensation awards
Equity
Stock issued (in shares) | shares			629,092	387,425
Proceeds received, net of offering costs			$ 25	$ 16
Stock compensation awards | Edison International
Equity
Stock issued (in shares) | shares			629,092	387,425
Proceeds received, net of offering costs			$ 25	$ 16
Optional cash investments
Equity
Stock issued (in shares) | shares			26,475	35,999
Proceeds received, net of offering costs			$ 2	$ 2
Optional cash investments | Edison International
Equity
Stock issued (in shares) | shares				35,999
Proceeds received, net of offering costs				$ 2
SCE
Basis of Presentation
Weighted-average equity component authorization (as a percent)	52.00%				48.00%	45.20%
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months)					37 months	37 months
Wildfire related charge incurred after tax						$ 1,800
Spot rate equity ratio						47.70%
Waiver threshold percent						47.70%
Weighted-average common equity component of total capitalization percent						48.70%
Debt and Credit Agreements
Commitment		$ 3,350	3,350
Outstanding borrowings		(601)	(601)
Amount available		$ 2,554	$ 2,554
Covenant debt to total capitalization ratio		0.65	0.65
Actual debt to capitalization ratio		0.55	0.55
Related Party Transactions
Current receivables due from affiliates				$ 268
SCE | Multi-year credit facilities
Debt and Credit Agreements
Commitment		$ 3,350	$ 3,350
Outstanding borrowings		(601)	(601)
Amount available		2,554	2,554
Contingent maximum available borrowing		$ 4,000	$ 4,000