Leases (Components of Lease Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease cost	$ 1,412	$ 1,368	$ 4,169	$ 4,072
Finance lease cost:
Amortization of leased assets in property, plant and equipment	59	55	178	149
Interest on lease obligation	47	39	140	120
Total finance lease cost	$ 106	$ 94	$ 318	$ 269