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Unsecured Debt (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Apr. 30, 2018
Mar. 31, 2018
Jan. 31, 2018
Dec. 31, 2017
May 31, 2018
May 31, 2017
Sterling-denominated floating rate bank loan due December 2022            
Debt Instrument [Line Items]            
Proceeds from long-term debt       $ 469    
Senior notes            
Debt Instrument [Line Items]            
Repayments of long-term debt       $ 500    
Euro floating rate bank loans            
Debt Instrument [Line Items]            
Repayments of long-term debt     $ 365      
Euro-denominated floating rate bank loan due 2020            
Debt Instrument [Line Items]            
Proceeds from long-term debt   $ 370        
Export credit facility            
Debt Instrument [Line Items]            
Proceeds from long-term debt $ 224 $ 555        
Commercial paper            
Debt Instrument [Line Items]            
Current unsecured debt         $ 606  
Proceeds from short term debt         2 $ 111
Repayments of short term debt         2 $ 364
Euro-denominated bank loan | Euro-denominated bank loans            
Debt Instrument [Line Items]            
Current unsecured debt         $ 231