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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Senior secured debt $ 23,591 $ 23,470
Net debt issuance costs (151) (164)
Total debt (average life of 6.6 years, rates averaging 5.2%) 33,192 33,058
Less amounts due within one year 1,692 200
Long-term debt 31,500 32,858
Senior Secured Asset-Based Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit 3,750 3,680
Senior Secured Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit 140  
Senior Secured Term Loan Facilities [Member]    
Debt Instrument [Line Items]    
Senior secured debt 3,849 3,891
Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Senior secured debt 15,300 15,300
Other Senior Secured Debt [Member]    
Debt Instrument [Line Items]    
Other senior secured debt 552 599
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Senior unsecured notes $ 9,752 $ 9,752