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Financing Arrangements - Narrative (Details)
12 Months Ended
Jun. 05, 2018
EUR (€)
Apr. 23, 2018
USD ($)
Sep. 27, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
BRL (R$)
Jun. 30, 2018
USD ($)
Jun. 05, 2018
USD ($)
Apr. 26, 2018
USD ($)
Nov. 09, 2017
EUR (€)
Nov. 09, 2017
USD ($)
Nov. 01, 2017
USD ($)
Mar. 01, 2017
USD ($)
Dec. 31, 2016
USD ($)
Letter of Credit Subfacility Maturing 2017                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity       $ 302,000,000   R$ 1,000,000,000 $ 259,000,000              
Line of Credit | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity       0     0              
Line of Credit | Foreign Line of Credit                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity       $ 300,000,000 € 250,000,000   292,000,000              
Notes Maturing 2026, 1.250 Percent Interest Rate | Senior Notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount                   € 600,000,000 $ 699,000,000      
Debt instrument, interest rate, stated percentage                   1.10% 1.10%      
Debt instrument, redemption price, percentage       101.00%                    
Notes Matured 2018, 4.50 Percent Interest Rate | Senior Notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount                 $ 363,000,000          
Debt instrument, interest rate, stated percentage                 4.50%          
Notes Matured 2017, 1.65 Percent Interest Rate | Senior Notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount                       $ 300,000,000    
Debt instrument, interest rate, stated percentage                       1.65%    
Notes Matured 2017, 1.35 Percent Interest Rate | Senior Notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount                         $ 250,000,000  
Debt instrument, interest rate, stated percentage                         1.35%  
Term Loan Agreement | Secured Debt                            
Debt Instrument [Line Items]                            
Debt instrument, face amount € 600,000,000 $ 1,000,000,000.0           $ 703,000,000            
Debt instrument, additional term   6 months                        
Line of credit facility, commitment fee percentage 0.125% 0.125%                        
Ratio of indebtedness to net capital 0.60 0.60           0.60            
Debt instrument, covenant, rolling twelve month coverage ratio, minimum 3.0 3.0                        
Term Loan Agreement | Secured Debt | EURIBOR                            
Debt Instrument [Line Items]                            
Debt Instrument, basis spread on variable rate 1.00%                          
Term Loan Agreement | Secured Debt | London Interbank Offered Rate (LIBOR)                            
Debt Instrument [Line Items]                            
Debt Instrument, basis spread on variable rate   1.125%                        
Term Loan Agreement | Secured Debt | Prime Rate                            
Debt Instrument [Line Items]                            
Debt Instrument, basis spread on variable rate 0.125% 0.125%                        
Third Amended and Restated Long-Term Credit Agreement | Line of Credit | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity     $ 3,000,000,000.0       $ 3,000,000,000.0             $ 2,500,000,000.0
Line of credit facility, commitment fee percentage     0.125%                      
Ratio of indebtedness to net capital     0.60                      
Debt instrument, covenant, rolling twelve month coverage ratio, minimum     3.0                      
Third Amended and Restated Long-Term Credit Agreement | Line of Credit | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Debt Instrument, basis spread on variable rate     1.125%                      
Third Amended and Restated Long-Term Credit Agreement | Line of Credit | Prime Rate | Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Debt Instrument, basis spread on variable rate     0.125%