Leases (Components of Lease Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease cost	$ 1,395	$ 1,347
Finance lease cost:
Amortization of right-of-use assets	57	45
Interest on lease obligation	46	37
Total finance lease cost	$ 103	$ 82