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Aggregate Maturities of Debt and Capital Leases Based on Stated Contractual Maturities (Detail)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2018 $ 1,163
2019 2,651
2020 896
2021 3,373
2022 754
Thereafter 5,362
Total $ 14,199