Commitments and Contingencies (Wildfire Legislation) (Details) - USD ($) $ in Millions			1 Months Ended				9 Months Ended	12 Months Ended
	Jan. 01, 2021	Aug. 01, 2019	Jun. 30, 2021	Nov. 30, 2020	Sep. 30, 2019	Jul. 31, 2019	Sep. 30, 2021	Dec. 31, 2020	Mar. 31, 2021	Feb. 28, 2021	Jul. 31, 2020
SCE, SDG&A and PG&E | Wildfire Insurance Fund
Other Commitments [Line Items]
Total annual commitment					$ 3,000.0
Insurance fund contribution amortization period					10 years
Aggregate annual contributions							$ 600.0
Revenue collected to support bond issuance					$ 10,500.0
SCE and SDG&E | Wildfire Insurance Fund
Other Commitments [Line Items]
Initial Wildfire Insurance Fund contributions					2,700.0
SCE
Other Commitments [Line Items]
Revenue recovery period						2 years
Capital expenditures excluded		$ 1,600.0	$ 518.0
AB 1054 excluded capital expenditures spent							1,600.0
Requested irrevocable order to finance			1,000.0	$ 340.0
SCE | Track One
Other Commitments [Line Items]
Capital expenditures excluded			219.0
SCE | Track Two
Other Commitments [Line Items]
Capital expenditures excluded			$ 299.0
SCE | Recovery Bonds
Other Commitments [Line Items]
Debt									$ 338.0	$ 338.0
SCE | Wildfire Insurance Fund
Other Commitments [Line Items]
Initial Wildfire Insurance Fund contributions					2,400.0		$ 2,600.0
Insurance fund contribution amortization period	15 years							10 years
Amount to be collected from ratepayers					$ 6,100.0
Revenue recovery period					15 years
Expected annual contribution					$ 95.0
Maximum aggregate requirement to reimburse the insurance fund percent					0.20%
Minimum weighted-average equity component authorization (as a percent)							52.00%
Initial liability cap							$ 3,200.0
SDG&E | Wildfire Insurance Fund
Other Commitments [Line Items]
Amount to be collected from ratepayers					$ 1,300.0
PG&E | Wildfire Insurance Fund
Other Commitments [Line Items]
Initial Wildfire Insurance Fund contributions											$ 4,800.0
Amount to be collected from ratepayers					$ 6,100.0