Commitments and Contingencies (Recovery of Wildfire-Related Costs ) (Details) - USD ($) $ in Millions					1 Months Ended		3 Months Ended	12 Months Ended
	Jan. 01, 2021	Jul. 01, 2020	Jan. 01, 2020	Jul. 12, 2019	Nov. 30, 2020	Sep. 30, 2019	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 25, 2021
Other Commitments [Line Items]
Amortization period								10 years
Subsequent event
Other Commitments [Line Items]
Amortization period							15 years
SCE and SDG&E
Other Commitments [Line Items]
Initial contributions						$ 2,700
Two annual contributions								$ 600
PG&E
Other Commitments [Line Items]
Expected initial contribution		$ 4,800
Initial contribution from ratepayers				$ 6,100
PG&E, SCE and SDG&E
Other Commitments [Line Items]
Expected annual contribution				3,000
SCE
Other Commitments [Line Items]
Initial contributions						$ 2,400
Expected annual contribution				95
Initial contribution from ratepayers				$ 6,100
Annual contributions								$ 2,600
Amortization period								10 years
Fund expected life								15 years
Maximum aggregate requirement to reimburse the insurance fund percent				20.00%
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)			52.00%						48.00%	45.20%
Capital expenditures				$ 1,600
AB 1054 excluded capital expenditures								$ 1,300
SCE | Subsequent event | Securitized bonds | Securitized bonds
Other Commitments [Line Items]
Debt, face amount											$ 338
SCE | CPUC
Other Commitments [Line Items]
Requested irrevocable order					$ 340
SCE | Forecast
Other Commitments [Line Items]
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)	52.00%
Initial liability cap	$ 3,200
SDG&E
Other Commitments [Line Items]
Initial contribution from ratepayers				$ 1,300