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Long-term Debt and Other Financing Arrangements - Annual Maturities of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
2017 $ 143  
2018 278  
2019 1,397  
2020 814  
2021 1,021  
Thereafter 4,110  
Total $ 7,763 $ 7,196