Financing and Leases - Georgia Power Lease Modification (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jul. 31, 2022	Dec. 31, 2021
Lessor, Lease, Description [Line Items]
Operating lease right-of-use assets, net of amortization	$ 1,560		$ 1,701
Revision of Prior Period, Adjustment
Lessor, Lease, Description [Line Items]
Operating lease right-of-use assets, net of amortization		$ (17)
Lease obligations		(18)
Finance lease ROU assets, net		112
Finance lease obligations		$ 113