Leases Maturity (Details) $ in Millions	Dec. 31, 2020 USD ($)
Leases [Abstract]
2020 - Operating Leases	$ 287
2020 - Financing Leases	63
2021 - Operating Leases	233
2021 - Financing Leases	63
2022 - Operating Leases	146
2022 - Financing Leases	62
2023 - Operating Leases	94
2023 - Financing Leases	49
2024 - Operating Leases	70
2024 - Financing Leases	38
Thereafter - Operating Leases	428
Thereafter - Financing Leases	55
Total lease payments - Operating Leases	1,258
Total lease payments - Financing Leases	330
Imputed interest - Operating Leases	(249)
Imputed interest - Financing Leases	(188)
Total - Operating Leases	1,009
Total - Financing Leases	$ 142