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Leases - Future Rental Commitments for Operating Leases (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 396
2020 259
2021 219
2022 164
2023 137
2024 and thereafter 613
Total future minimum payments 1,788
Future minimum sublease rentals $ 29