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Unsecured Debt (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2018
Dec. 31, 2017
Feb. 28, 2018
Feb. 28, 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      
Commercial paper        
Debt Instrument [Line Items]        
Current unsecured debt     $ 862  
Proceeds from short term debt     2 $ 111
Repayments of short term debt     0 $ 240
Euro-denominated bank loan | Euro-denominated bank loans        
Debt Instrument [Line Items]        
Current unsecured debt     $ 246