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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Senior secured debt $ 19,875 $ 18,288
Net debt issuance costs (255) (236)
Total debt (average life of 9.7 years, rates averaging 4.9%) 32,572 31,004
Less amounts due within one year 253 209
Long-term debt 32,319 30,795
Senior Secured Asset-Based Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term line of credit 800 0
Senior Secured Term Loan Facilities [Member]    
Debt Instrument [Line Items]    
Senior secured debt 2,000 3,671
Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Senior secured debt 16,200 13,850
Other Senior Secured Debt [Member]    
Debt Instrument [Line Items]    
Other senior secured debt 875 767
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