Leases (Maturity of Lease Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Operating leases
2022	$ 226
2023	196
2024	162
2025	124
2026	84
Thereafter	101
Total	893
Less amount representing interest	(70)
Present value of lease liabilities	823
Finance leases
2022	56
2023	44
2024	26
2025	12
2026	2
Thereafter	4
Total	144
Less amount representing interest	(9)
Present value of lease liabilities	$ 135	$ 135