Variable Interest Entities (Narrative) (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) MW	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items]
Investments		$ 71	$ 71	$ 70
NWO Holdco, L.L.C
Variable Interest Entity [Line Items]
Sale of noncontrolling interest	$ 49
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		$ 71	$ 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%