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Debt Obligations - Schedule of Short-term Debt (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Current maturities of long-term liabilities $ 2,386 $ 2,674
Total short term debt $ 2,709 3,188
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Weighted average interest rate [1] LIBOR+1.75  
Short-term borrowings [1] $ 300 0
Convertible senior debentures [Member]    
Debt Instrument [Line Items]    
Weighted average interest rate 0.25%  
Maturity 2026  
Short-term borrowings $ 23 $ 514
[1] As of the date of this Quarterly Report on Form 10-Q, no amounts were outstanding under the RCF.