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Long-Term Debt - Maturities of Long-term Debt Outstanding (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
2019 $ 8,080  
2020 6,407  
2021 6,719  
2022 4,082  
2023 2,004  
Thereafter 14,048  
Total 41,340 $ 32,259
Parent Company [Member]    
Debt Instrument [Line Items]    
2019 1,497  
2021 2,696  
2022 3,793  
Thereafter 8,305  
Total $ 16,291 $ 15,769