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Long-Term Debt and Short-Term Borrowings - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Aug. 31, 2015
USD ($)
Jul. 31, 2014
EUR (€)
Dec. 31, 2012
GBP (£)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2012
USD ($)
Floating Rate UK Borrowing repaid December 2014                    
Debt Instrument [Line Items]                    
Term of debt instrument       3 years            
Current borrowing capacity       £ 66           $ 106
Five-year credit facility agreement                    
Debt Instrument [Line Items]                    
Term of debt instrument 5 years       5 years          
Credit facility amount prior to new agreement $ 2,250                  
Current borrowing capacity             $ 3,750      
Maximum increase available subject to lender approval         $ 1,250          
Maximum borrowing capacity including portion subject to lender approval             $ 5,000      
Required minimum EBITDA to Interest Ratio           3.0 3.0      
Number of consecutive quarters over which the ratio of required EBITDA to Interest Ratio is calculated         4          
Actual EBITDA to Interest Ratio         44          
Fixed rate medium term note due 2020                    
Debt Instrument [Line Items]                    
Principal amount             $ 200      
June 2014 medium term notes issued                    
Debt Instrument [Line Items]                    
Principal amount                 $ 950  
Fixed rate euro medium term notes due February 2022                    
Debt Instrument [Line Items]                    
Principal amount | €           € 500        
Fixed rate euro medium term notes due 2031                    
Debt Instrument [Line Items]                    
Principal amount | €           € 500        
Fixed rate medium term notes due 2021                    
Debt Instrument [Line Items]                    
Principal amount             600      
Fixed rate medium term notes due 2026                    
Debt Instrument [Line Items]                    
Principal amount             650      
Fixed rate medium term notes due 2046                    
Debt Instrument [Line Items]                    
Principal amount             500      
Fixed rate Eurobond which matured in July 2014                    
Debt Instrument [Line Items]                    
Principal amount | €     € 1,025              
Term of debt instrument     7 years              
Interest rate, stated percentage (as a percent)     5.00%              
Fixed rate medium term notes repaid 2016                    
Debt Instrument [Line Items]                    
Principal amount               $ 1,000    
Stand alone letters of credit and bank guarantees                    
Debt Instrument [Line Items]                    
Amount of stand alone letters of credit and bank guarantees outstanding utilized in connection with normal business activities             $ 291      
Interest rate swap contracts | Fixed rate medium term note due 2018                    
Debt Instrument [Line Items]                    
Derivative notional amount   $ 450                
Term of derivative contract   3 years                
Interest rate swap contracts | Fixed rate medium term note due 2020                    
Debt Instrument [Line Items]                    
Derivative notional amount   $ 300                
Term of derivative contract   5 years                
Interest rate swap contracts | June 2014 medium term notes issued                    
Debt Instrument [Line Items]                    
Derivative notional amount                 $ 600