Leases - Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating Leases
2022	$ 457
2023	355
2024	253
2025	198
2026	149
Thereafter	490
Total lease payments	1,902
Less: interest	(346)
Total	1,556
Less: current portion	(385)	$ (379)
Long-term portion	1,171	1,405
Finance Leases
2022	33
2023	28
2024	28
2025	28
2026	28
Thereafter	223
Total lease payments	368
Less: interest	(98)
Total	270
Less: current portion	(19)	(26)
Long-term portion	$ 251	$ 267