Leases, Remaining Minimum Lease Payments (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating Leases
2022	$ 351
2023	280
2024	207
2025	142
2026	111
Thereafter	417
Total undiscounted lease payments	1,508
Less: Amount associated with discounting	253
Total lease liabilities	1,255	$ 1,170
Finance Leases
2022	228
2023	230
2024	214
2025	213
2026	190
Thereafter	1,629
Total undiscounted lease payments	2,704
Less: Amount associated with discounting	784
Total lease liabilities	$ 1,920	$ 1,664