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Financing Arrangements - Narrative (Details)
12 Months Ended
May 17, 2016
USD ($)
Dec. 31, 2017
USD ($)
Mar. 31, 2018
EUR (€)
Mar. 31, 2018
BRL (R$)
Mar. 31, 2018
USD ($)
Nov. 09, 2017
EUR (€)
Nov. 09, 2017
USD ($)
Nov. 01, 2017
USD ($)
Sep. 27, 2017
USD ($)
Mar. 01, 2017
USD ($)
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 $ 301,000,000          
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   308,000,000          
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 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%
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 $ 2,500,000,000.0       $ 3,000,000,000.0       $ 3,000,000,000.0  
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                  
London Interbank Offered Rate (LIBOR) | Third Amended and Restated Long-Term Credit Agreement | Line of Credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Debt Instrument, basis spread on variable rate 1.125%                  
Prime Rate | Third Amended and Restated Long-Term Credit Agreement | Line of Credit | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Debt Instrument, basis spread on variable rate 0.125%