Commitments and Contingencies (Recovery of Wildfire-Related Costs) (Details) - USD ($) $ in Millions				1 Months Ended			9 Months Ended	12 Months Ended	13 Months Ended	14 Months Ended
	Jul. 01, 2020	Aug. 01, 2019	Jul. 12, 2019	Jul. 28, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Nov. 30, 2018	Jun. 30, 2020	Sep. 30, 2020
Loss Contingencies [Line Items]
Anticipated raise from issuance of equity						$ 1,200
Southern California Edison
Loss Contingencies [Line Items]
Wildfire-specific insurance coverage								$ 1,000	$ 1,200
Initial contribution						2,400
Expected annual contribution			$ 95
Expected future contribution from ratepayers			$ 6,100
Anticipated issuance of long-term debt						1,200
Maximum aggregate requirement to reimburse the insurance fund percent			20.00%
Initial Liability Cap			$ 3,000
Excluded wildfire risk mitigation capital expenditures		$ 1,600			$ 1,600
AB 1054 Excluded Capital Expenditures										$ 1,100
Southern California Edison | CPUC
Loss Contingencies [Line Items]
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)							52.00%
Requested irrevocable order				$ 337
SCE and SDG&E
Loss Contingencies [Line Items]
Initial contribution						$ 2,700
PG&E
Loss Contingencies [Line Items]
Initial contribution	$ 4,800
Expected future contribution from ratepayers			6,100
SCE, SDG&E and PG&E
Loss Contingencies [Line Items]
Initial contribution							$ 300
Expected annual contribution			3,000
SDG&E
Loss Contingencies [Line Items]
Expected future contribution from ratepayers			$ 1,300