Variable Interest Entities - Net Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Noncontrolling interest	$ 299	$ 218
Great Valley Solar
Business Acquisition [Line Items]
Non-utility property, less accumulated depreciation	275	284
Other assets	37	39
Total assets	312	323
Other liabilities	14	13
Total liabilities	14	13
Accumulated depreciation	26	18
Copper Mountain Solar - Mesquite Solar
Business Acquisition [Line Items]
Non-utility property, less accumulated depreciation	431	446
Other assets	167	176
Total assets	598	622
Other liabilities	74	71
Total liabilities	74	71
Accumulated depreciation	44	30
CED Nevada Virginia
Business Acquisition [Line Items]
Non-utility property, less accumulated depreciation	643
Other assets	55
Total assets	698
Other liabilities	315
Total liabilities	315
Accumulated depreciation	10
Tax Equity Investors
Business Acquisition [Line Items]
Noncontrolling interest	95
Tax Equity Investors | Great Valley Solar
Business Acquisition [Line Items]
Noncontrolling interest	84	82
Tax Equity Investors | Copper Mountain Solar - Mesquite Solar
Business Acquisition [Line Items]
Noncontrolling interest	$ 118	$ 134