Financing and Leases - Georgia Power Lease Modification (Details) - USD ($) $ in Millions	Jul. 27, 2022	Jun. 30, 2022	Dec. 31, 2021
Lessor, Lease, Description [Line Items]
Operating lease right-of-use assets, net of amortization		$ 1,623	$ 1,701
Revision of Prior Period, Adjustment | Subsequent Event
Lessor, Lease, Description [Line Items]
Operating lease right-of-use assets, net of amortization	$ (17)
Lease obligations	(18)
Finance lease ROU assets, net	110
Finance lease obligations	$ 111