Income Taxes, Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unrecognized Tax Benefits
Unrecognized tax benefits	$ 284	$ 816	$ 847	$ 897
Tax refund claims not yet filed but that we intend to file	0	(28)
Interest and penalties	105	86
Liability for unrecognized tax benefits presented in our balance sheets	$ 389	$ 874