v3.20.4
Debt - Principal Amounts of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 0  
2022 1,000  
2023 900  
2024 1,000  
2025 500  
Due after 5 years 4,250  
Amount outstanding 7,650  
Total principal $ 7,650 $ 7,400