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Unsecured Debt (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 28, 2019
Dec. 31, 2018
Feb. 28, 2019
Feb. 28, 2018
Euro-denominated bank loan | Export credit facility due 2031        
Debt Instrument [Line Items]        
Proceeds from long-term debt $ 587      
Export credit facility | Export credit facility due 2031        
Debt Instrument [Line Items]        
Proceeds from long-term debt   $ 852    
Export credit facility | Export credit facility due 2035        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity 899   $ 899  
Commercial paper        
Debt Instrument [Line Items]        
Current unsecured debt $ 768   768  
Proceeds from short term debt     0 $ 2
Repayments of short term debt     $ 0 $ 0