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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Senior secured debt $ 21,733 $ 21,226
Net debt issuance costs (170) (157)
Total debt (average life of 6.4 years, rates averaging 5.5%) 34,815 32,821
Less amounts due within one year 3,796 788
Long-term debt 31,019 32,033
Senior Secured Asset-Based Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit 3,500 3,040
Senior Secured Term Loan Facilities [Member]    
Debt Instrument [Line Items]    
Senior secured debt 3,776 3,801
Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Senior secured debt 13,800 13,800
Other Senior Secured Debt [Member]    
Debt Instrument [Line Items]    
Other senior secured debt 657 585
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Senior unsecured notes $ 13,252 $ 11,752