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Long-Term Debt - Maturities of Long-term Debt Outstanding (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
2017 $ 5,461  
2018 7,282  
2019 6,019  
2020 43  
2021 2,221  
Thereafter 12,297  
Total 33,323 $ 32,078
Parent Company [Member]    
Debt Instrument [Line Items]    
2017 1,250  
2018 1,498  
2019 1,503  
2021 2,195  
Thereafter 6,599  
Total $ 13,045 $ 11,453