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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Senior secured debt $ 18,257 $ 20,709
Net debt issuance costs (245) (239)
Total debt (average life of 9.1 years, rates averaging 5.0%) 30,964 33,722
Less amounts due within one year 172 145
Long-term debt 30,792 33,577
Senior Secured Asset-Based Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit 0 2,480
Senior secured 364-day term loan facility [Member]    
Debt Instrument [Line Items]    
Senior secured debt 0 0
Senior Secured Term Loan Facilities [Member]    
Debt Instrument [Line Items]    
Senior secured debt 3,684 3,725
Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Senior secured debt 13,850 13,850
Other Senior Secured Debt [Member]    
Debt Instrument [Line Items]    
Other senior secured debt 723 654
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Senior unsecured notes 12,952 13,252
Senior Secured Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit $ 0 $ 0