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Long-Term Debt - Maturities of Long-term Debt Outstanding (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
2021 $ 7,266  
2022 8,610  
2023 2,870  
2024 5,933  
2025 5,888  
Thereafter 10,730  
Total 41,297 $ 40,167
Parent Company [Member]    
Debt Instrument [Line Items]    
2021 1,509  
2022 3,855  
2024 5,913  
2025 2,283  
Thereafter 7,364  
Total $ 20,924 $ 18,602