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Debt Obligations - Schedule of Short-term Debt (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Current maturities of long-term liabilities $ 2,674 $ 1,831
Total short term debt $ 3,188 2,345
Convertible senior debentures [Member]    
Debt Instrument [Line Items]    
Weighted average interest rate 0.25%  
Maturity 2026  
Short-term borrowings $ 514 $ 514