Commitments and Contingencies (Recovery of Wildfire-Related Costs) (Details) - USD ($) $ in Millions			1 Months Ended	8 Months Ended	12 Months Ended
	Aug. 01, 2019	Jul. 12, 2019	Sep. 30, 2019	Mar. 31, 2020	Dec. 31, 2020
Loss Contingencies [Line Items]
Anticipated raise from issuance of equity			$ 1,200
SCE and SDG&E
Loss Contingencies [Line Items]
Initial contribution		$ 2,700
Expected annual contribution		1,100
Annual contributions		107
SCE, SDG&E and PG&E
Loss Contingencies [Line Items]
Expected annual contribution		1,900
PG&E
Loss Contingencies [Line Items]
Expected initial contribution		4,800
Expected future contribution from ratepayers		6,100
Southern California Edison
Loss Contingencies [Line Items]
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
AB 1054 Excluded Capital Expenditures				$ 601
SDG&E
Loss Contingencies [Line Items]
Expected future contribution from ratepayers		$ 1,300
Subsequent event | Southern California Edison
Loss Contingencies [Line Items]
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)					52.00%