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Leases - Capital Lease Maturities Under Topic 840 (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 51
2020 36
2021 23
2022 21
2023 20
2024 and thereafter 183
Total minimum payments 334
Less: amount representing interest and executory costs (100)
Present value of minimum payments 234
Less: current portion (38)
Long-term portion $ 196