Variable Interest Entities - Net Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Noncontrolling interest	$ 245	$ 299
Great Valley Solar
Variable Interest Entity [Line Items]
Non-utility property, less accumulated depreciation	273	275
Other assets	41	37
Total assets	314	312
Other liabilities	15	14
Total liabilities	15	14
Accumulated depreciation	29	26
Great Valley Solar | Tax Equity Investors
Variable Interest Entity [Line Items]
Noncontrolling interest	80	84
Copper Mountain - Mesquite Solar
Variable Interest Entity [Line Items]
Non-utility property, less accumulated depreciation	428	431
Other assets	169	167
Total assets	597	598
Other liabilities	77	74
Total liabilities	77	74
Accumulated depreciation	48	44
Copper Mountain - Mesquite Solar | Tax Equity Investors
Variable Interest Entity [Line Items]
Noncontrolling interest	112	118
CED Nevada Virginia
Variable Interest Entity [Line Items]
Non-utility property, less accumulated depreciation	636	643
Other assets	57	55
Total assets	693	698
Other liabilities	327	315
Total liabilities	327	315
Noncontrolling interest	51	95
Accumulated depreciation	$ 15	$ 10