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Long-Term Debt and Short-Term Borrowings - Long-Term Debt Maturities (Details)
€ in Millions, $ in Millions
1 Months Ended 3 Months Ended
Nov. 30, 2018
EUR (€)
Aug. 31, 2018
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Oct. 31, 2017
USD ($)
Debt instrument            
Debt repurchases           $ 305
Loss on early debt extinguishment         $ 96  
Repayment of debt € 500 $ 450        
Fixed rate medium term notes repaid June 2017            
Debt instrument            
Repayment of debt     $ 650      
Notes Due 2028            
Debt instrument            
Debt repurchases           110
Principal amount           $ 330
Interest rate, stated percentage (as a percent)           6.375%
Notes Due 2037            
Debt instrument            
Debt repurchases           $ 195
Principal amount           $ 750
Interest rate, stated percentage (as a percent)           5.70%
Fixed rate medium term notes repaid 2016            
Debt instrument            
Repayment of debt       $ 1,000