Commitments and Contingencies (Wildfire Legislation) (Details) - USD ($) $ in Millions				1 Months Ended	12 Months Ended
	Jan. 01, 2020	Jul. 12, 2019	Jan. 01, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Other Commitments [Line Items]
Consideration received per transaction					$ 1,200
Southern California Edison Company and San Diego Gas & Electric
Other Commitments [Line Items]
Initial contributions		$ 2,700
Expected annual contribution		1,000
Annual contributions		107
Pacific Gas & Electric Company
Other Commitments [Line Items]
Expected initial contribution		4,800
Southern California Edison Company and San Diego Gas & Electric and Pacific Gas & Electric
Other Commitments [Line Items]
Expected annual contribution		3,000
Initial contribution from ratepayers		$ 13,500
Southern California Edison Company
Other Commitments [Line Items]
Initial contributions				$ 2,400
Expected annual contribution			$ 95
Issuance of long-term debt					$ 1,200
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)					48.00%	45.20%
Initial liability cap		$ 3,000
Capital expenditures		$ 1,600
Subsequent event | Southern California Edison Company
Other Commitments [Line Items]
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)	52.00%