Summary of Significant Accounting Policies (SCE Dividends) (Details) - SCE - USD ($) $ in Millions			12 Months Ended		24 Months Ended
	Feb. 27, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)			48.00%	45.20%
Spot rate equity ratio				47.00%
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months)			37 months
Waiver threshold percent			47.00%
Weighted-average common equity component of total capitalization percent (below)			48.50%
Wildfire related charge incurred after tax					$ 2,000
Capacity to pay additional dividends			$ 179
Restriction on net assets			$ 17,600		$ 17,600
Weighted-average common equity component of total capitalization percent with CPUC waiver			49.60%
Subsequent event
Significant Accounting Policies [Line Items]
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent)		52.00%
Dividends	$ 269