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Debt Obligations - Schedule of Short-term Debt (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Current maturities of long-term liabilities $ 1,474 $ 1,474 $ 1,831
Total short term debt $ 2,106 2,106 2,345
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Weighted average interest rate LIBOR+1.75    
Short-term borrowings $ 117 $ 117  
Convertible senior debentures [Member]      
Debt Instrument [Line Items]      
Weighted average interest rate 0.25% 0.25%  
Maturity   2026  
Short-term borrowings $ 514 $ 514 $ 514