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Long-Term Debt - Maturities of Long-term Debt Outstanding (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
2022 $ 4,834  
2023 3,847  
2024 5,768  
2025 5,804  
2026 4,200  
Thereafter 7,672  
Total 32,125 $ 41,297
Parent Company [Member]    
Debt Instrument [Line Items]    
2022 2,311  
2023  
2024 5,740  
2025 2,240  
2026 2,685  
Thereafter 5,926  
Total $ 18,902 $ 20,924