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Financing Arrangements - Narrative (Details)
6 Months Ended
May 17, 2016
USD ($)
Jun. 30, 2016
EUR (€)
Jun. 30, 2016
BRL
Jun. 30, 2016
USD ($)
Jun. 15, 2016
USD ($)
May 23, 2016
USD ($)
Dec. 31, 2015
USD ($)
Letter of Credit Subfacility Maturing 2017              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity     BRL 1,000,000,000 $ 312,000,000      
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity       0      
Line of Credit | Foreign Line of Credit              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity   € 250,000,000   277,000,000      
Notes Maturing 2046, 4.5 Percent Interest Rate [Member] | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount           $ 500,000,000  
Debt instrument, interest rate, stated percentage           4.50%  
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     $ 2,500,000,000.0     $ 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            
Notes Matured 2016, 6.5 Percent Interest Rate | Senior Notes              
Debt Instrument [Line Items]              
Debt instrument, face amount         $ 250,000,000    
Debt instrument, interest rate, stated percentage         6.50%    
Debt instrument, redemption price, percentage   101.00%          
Amended and Restated Short-Term Credit Agreement, September 25, 2015 | Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Line of credit facility, maximum borrowing capacity $ 500,000,000            
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%