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Long-term Debt and Other Financing Arrangements - Annual Maturities of Long-Term Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
For October 1, 2019 to December 31, 2019 $ 202  
2020 854  
2021 702  
2022 2,399  
2023 3,693  
Thereafter 499  
Total $ 8,349 $ 8,225