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Financing Arrangements (Narrative) (Details)
12 Months Ended 22 Months Ended
Aug. 09, 2019
USD ($)
Mar. 01, 2019
USD ($)
Feb. 27, 2019
EUR (€)
Feb. 27, 2019
USD ($)
Feb. 26, 2019
USD ($)
Apr. 26, 2018
USD ($)
Sep. 27, 2017
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Aug. 06, 2019
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Aug. 05, 2019
EUR (€)
Debt Instrument [Line Items]                            
Repayments of long-term debt               $ 949,000,000 $ 386,000,000 $ 564,000,000        
101% Notes Maturing 2029 | Senior Notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount         $ 700,000,000                  
Debt instrument, interest rate, stated percentage         4.75%                  
Debt instrument, redemption price, percentage         101.00%                  
Term Loan Agreement | Secured Debt                            
Debt Instrument [Line Items]                            
Repayments of long-term debt $ 1,000,000,000.0   € 600,000,000 $ 673,000,000                    
Senior Note - 2.40% Maturing 2019                            
Debt Instrument [Line Items]                            
Debt instrument, interest rate, stated percentage   2.40%                        
Repayments of long-term debt   $ 250,000,000                        
Senior Note - 4.50% Maturing 2018                            
Debt Instrument [Line Items]                            
Debt instrument, interest rate, stated percentage           4.50%                
Repayments of long-term debt           $ 363,000,000                
Revolving Credit Facility | Line of Credit                            
Debt Instrument [Line Items]                            
Line of credit outstanding                 $ 0       $ 0  
Revolving Credit Facility | Third Amended and Restated Long-Term Credit Agreement | Line of Credit                            
Debt Instrument [Line Items]                            
Line of credit facility, commitment fee percentage             0.10%              
Ratio of indebtedness to net capital             0.65              
Debt instrument, covenant, rolling twelve month coverage ratio, minimum             3.0              
Line of credit facility, maximum borrowing capacity                     $ 3,500,000,000   3,500,000,000  
Line of credit facility, increase                     $ 500,000,000      
Revolving Credit Facility | Third Amended and Restated Long-Term Credit Agreement | Line of Credit | London Interbank Offered Rate (LIBOR)                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate             1.125%              
Revolving Credit Facility | Third Amended and Restated Long-Term Credit Agreement | Line of Credit | Prime Rate                            
Debt Instrument [Line Items]                            
Debt instrument, basis spread on variable rate             0.125%              
Letter of Credit Subfacility Maturing 2022                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity                       R$ 1,000,000,000.0 $ 248,000,000  
Foreign Line of Credit | Line of Credit                            
Debt Instrument [Line Items]                            
Line of credit facility, maximum borrowing capacity | €                           € 250,000,000