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Debt and Capital Leases - Annual Payments Based on the Maturities of Debt and Capital Leases (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018 $ 695
2019 933
2020 805
2021 606
2022 1,854
Thereafter 11,745
Total $ 16,638