Variable Interest Entities (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) MW	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Variable Interest Entity [Line Items]
Investments | $	$ 76	$ 71	$ 71
Newport Solar Holdings
Variable Interest Entity [Line Items]
Sale of membership interest in VIE to tax equity investor | $	$ 86
Nameplate capacity (in MW) | MW	180
NWO Holdco, L.L.C
Variable Interest Entity [Line Items]
Nameplate capacity (in MW) | MW	100
Variable Interest Entity, Primary Beneficiary | Aviator Wind
Variable Interest Entity [Line Items]
Nameplate capacity (in MW) | MW	525
Ownership interest	51.00%
Variable Interest Entity, Primary Beneficiary | Aviator Wind Class B Membership
Variable Interest Entity [Line Items]
Noncontrolling ownership interest	49.00%
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Investments | $	$ 74	$ 71
Variable Interest Entity, Not Primary Beneficiary | T.E.S. Filer City
Variable Interest Entity [Line Items]
Ownership interest	50.00%
Variable Interest Entity, Not Primary Beneficiary | Grayling
Variable Interest Entity [Line Items]
Ownership interest	50.00%
Variable Interest Entity, Not Primary Beneficiary | Genesee
Variable Interest Entity [Line Items]
Ownership interest	50.00%
Variable Interest Entity, Not Primary Beneficiary | Craven
Variable Interest Entity [Line Items]
Ownership interest	50.00%