Leases (Future Minimum Maturities of Lease Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Operating Leases
Remainder of 2023	$ 1,182
2024	4,544
2025	3,943
2026	3,290
2027	2,662
Thereafter	9,866
Total lease payments	25,487
Less: imputed interest	(4,219)
Total	21,268	$ 22,206
Finance Leases
Remainder of 2023	82
2024	326
2025	332
2026	325
2027	323
Thereafter	1,147
Total lease payments	2,535
Less: imputed interest	(694)
Total	$ 1,841	$ 1,817