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Long-term Debt and Other Financing Arrangements - Annual Maturities of Long-Term Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
For April 1, 2021 to December 31, 2021 $ 824  
2023 2,580  
2025 1,529  
Thereafter 1,725  
Total $ 6,658 $ 6,862