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Long-Term Debt - Maturities of Long-term Debt Outstanding (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2020 $ 3,772  
2021 9,430  
2022 6,298  
2023 2,799  
2024 5,663  
Thereafter 12,205  
Total 40,167 $ 41,340
Parent Company [Member]    
Debt Instrument [Line Items]    
2021 2,696  
2022 3,790  
2024 5,657  
Thereafter 6,459  
Total $ 18,602 $ 16,291