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Long-term Debt and Other Financing Arrangements - Annual Maturities of Long-Term Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
For October 1, 2017 to December 31, 2017 $ 3  
2018 28  
2019 1,401  
2020 818  
2021 1,071  
2022 2,325  
Thereafter 2,625  
Total $ 8,271 $ 7,763