Equity (Issuances) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	May 31, 2019
Class of Stock [Line Items]
Equity contribution	$ 900
Preferred stock
Class of Stock [Line Items]
Proceeds received, net of offering costs	$ 2,000
Liquidation value (in dollars per share)	$ 1,000
Redemption amount (in dollars per share)	1,000
Redemption amount following change in criteria (in dollars per share)	$ 1,020
Preferred stock | SCE
Class of Stock [Line Items]
Stock issued (in shares)	0
Offering expenses	$ 44	$ 44
Series A
Class of Stock [Line Items]
Stock issued (in shares)	1,250,000
Preferred Stock, dividend rate, (as a percent)	5.375%
Dividend reset period	5 years
Margin rate for dividend rate reset (as a percent)	4.698%
Series B
Class of Stock [Line Items]
Stock issued (in shares)	750,000
Preferred Stock, dividend rate, (as a percent)	5.00%
Dividend reset period	5 years
Margin rate for dividend rate reset (as a percent)	3.901%
At-the-market Program (ATM)
Class of Stock [Line Items]
Stock issued (in shares)	0
Aggregate sale price			$ 1,500
Aggregate sales price remaining	$ 1,300
401(K)
Class of Stock [Line Items]
Stock issued (in shares)	522,400	1,644,500
Proceeds received, net of offering costs	$ 30	$ 99
Stock compensation awards
Class of Stock [Line Items]
Stock issued (in shares)	629,092	387,425
Proceeds received, net of offering costs	$ 25	$ 16
In lieu of dividend payment
Class of Stock [Line Items]
Stock issued (in shares)	293,031	280,707
Proceeds received, net of offering costs	$ 17	$ 17
Optional cash investments
Class of Stock [Line Items]
Stock issued (in shares)	26,475	35,999
Proceeds received, net of offering costs	$ 2	$ 2