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Financing Arrangements (Narrative) (Details)
3 Months Ended 12 Months Ended 22 Months Ended
May 07, 2020
USD ($)
Apr. 27, 2020
USD ($)
Mar. 13, 2020
USD ($)
Feb. 21, 2020
USD ($)
Aug. 09, 2019
USD ($)
Mar. 01, 2019
USD ($)
Feb. 27, 2019
USD ($)
Feb. 27, 2019
EUR (€)
Feb. 26, 2019
USD ($)
Apr. 26, 2018
USD ($)
Sep. 27, 2017
Jun. 30, 2018
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 06, 2019
USD ($)
Dec. 31, 2020
BRL (R$)
Mar. 12, 2020
USD ($)
Mar. 12, 2020
EUR (€)
Feb. 21, 2020
EUR (€)
Aug. 05, 2019
EUR (€)
Debt Instrument [Line Items]                                          
Repayments of long-term debt                         $ 569,000,000 $ 949,000,000 $ 386,000,000            
Short-term debt, commercial paper                         12,000,000 294,000,000              
Commercial paper                                          
Debt Instrument [Line Items]                                          
Short-term debt, commercial paper                         $ 0 274,000,000              
Senior Note - 4.60% Maturing 2050 | Senior Notes                                          
Debt Instrument [Line Items]                                          
Debt instrument, face amount $ 500,000,000                                        
Debt instrument, interest rate, stated percentage 4.60%                                        
Senior Note - 4.75% 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%               101.00%                        
Senior Note - 0.50% Maturing 2028 | Senior Notes                                          
Debt Instrument [Line Items]                                          
Debt instrument, face amount       $ 540,000,000                               € 500,000,000  
Debt instrument, interest rate, stated percentage       0.50%                               0.50%  
Debt instrument, redemption price, percentage       101.00%                                  
Senior Note - 0.625% Maturing 2020                                          
Debt Instrument [Line Items]                                          
Debt instrument, interest rate, stated percentage                         0.625%       0.625%        
Senior Note - 0.625% Maturing 2020 | Senior Notes                                          
Debt Instrument [Line Items]                                          
Debt instrument, face amount                                   $ 566,000,000 € 500,000,000    
Debt instrument, interest rate, stated percentage       0.625%                           0.625% 0.625% 0.625%  
Term Loan Agreement | Secured Debt                                          
Debt Instrument [Line Items]                                          
Repayments of long-term debt         $ 1,000,000,000.0   $ 673,000,000 € 600,000,000       $ 1,000,000,000.0                  
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 | 364-Day Credit Agreement | Line of Credit                                          
Debt Instrument [Line Items]                                          
Repayments of long-term debt     $ 500,000,000                                    
Line of credit facility, maximum borrowing capacity   $ 500,000,000                     3,500,000,000                
Line of credit facility, commitment fee percentage   0.40%                                      
Ratio of indebtedness to net capital   0.65                                      
Debt instrument, covenant, rolling twelve month coverage ratio, minimum   3.0                                      
Revolving Credit Facility | 364-Day Credit Agreement | Line of Credit | London Interbank Offered Rate (LIBOR)                                          
Debt Instrument [Line Items]                                          
Debt instrument, basis spread on variable rate   1.625%                                      
Revolving Credit Facility | 364-Day Credit Agreement | Line of Credit | Prime Rate                                          
Debt Instrument [Line Items]                                          
Debt instrument, basis spread on variable rate   0.625%                                      
Revolving Credit Facility | Third Amended and Restated Long-Term Credit Agreement | Line of Credit                                          
Debt Instrument [Line Items]                                          
Repayments of long-term debt     500,000,000                                    
Line of credit facility, maximum borrowing capacity     $ 2,200,000,000                   3,500,000,000     $ 3,500,000,000          
Line of credit facility, increase                               $ 500,000,000          
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                    
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                         $ 192,000,000       R$ 1,000,000,000.0        
Foreign Line of Credit | Line of Credit                                          
Debt Instrument [Line Items]                                          
Line of credit facility, maximum borrowing capacity | €                                         € 250,000,000