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Future Minimum Lease Payments Due Under Non-Cancelable Portions Of Leases (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]  
2017 $ 486
2018 369
2019 275
2020 180
2021 104
Thereafter 173
Total before sublease income 1,587
Less sublease income (31)
Total $ 1,556