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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Senior secured debt $ 18,349 $ 18,288
Net debt issuance costs (229) (236)
Total debt (average life of [9.4 years, rates averaging 5.4]%) 31,072 31,004
Less amounts due within one year 234 209
Long-term debt 30,838 30,795
Senior Secured Asset-Based Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit 80 0
Senior Secured Term Loan Facilities [Member]    
Debt Instrument [Line Items]    
Senior secured debt 3,657 3,671
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 762 767
Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Senior unsecured notes 12,952 12,952
Senior Secured Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit $ 0 $ 0