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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Senior secured debt $ 21,226 $ 23,470
Net debt issuance costs (157) (164)
Total debt (average life of 6.4 years, rates averaging 5.5%) 32,821 33,058
Less amounts due within one year 788 200
Long-term debt 32,033 32,858
Senior Secured Asset-Based Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit 3,040 3,680
Senior Secured Term Loan Facilities [Member]    
Debt Instrument [Line Items]    
Senior secured debt 3,801 3,891
Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Senior secured debt 13,800 15,300
Other Senior Secured Debt [Member]    
Debt Instrument [Line Items]    
Other senior secured debt 585 599
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Senior unsecured notes $ 11,752 $ 9,752