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Debt Obligations - Schedule of Short-term Debt (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Current maturities of long-term liabilities $ 2,256 $ 1,700
Total short term debt $ 2,771 2,216
Banks And Financial Institutions [Member]    
Debt Instrument [Line Items]    
Weighted average interest rate 4.25%  
Short-term borrowings $ 1 2
Convertible debentures [Member]    
Debt Instrument [Line Items]    
Weighted average interest rate 0.25%  
Maturity 2026  
Short-term borrowings $ 514 $ 514