Leases (Components of Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finance lease cost:
Amortization of right of use assets	$ 81	$ 78	$ 72
Interest on lease liabilities	29	31	35
Operating lease cost	490	565	658
Variable lease cost	59	62	60
Short-term lease cost	772	446	649
Total lease cost	$ 1,431	$ 1,182	$ 1,474