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Financing Arrangements - Narrative (Details)
3 Months Ended
May 07, 2020
USD ($)
Apr. 27, 2020
USD ($)
Mar. 13, 2020
USD ($)
Feb. 21, 2020
USD ($)
Sep. 27, 2017
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 12, 2020
USD ($)
Mar. 12, 2020
EUR (€)
Feb. 21, 2020
EUR (€)
Aug. 06, 2019
USD ($)
Debt Instrument [Line Items]                        
Repayments of long-term debt           $ 0 $ 566,000,000          
Amounts borrowed under line of credit           0 541,000,000          
Letter of Credit Subfacility Maturing 2022                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity           189,000,000   $ 206,000,000        
4.60% notes maturing 2050 | Senior Notes                        
Debt Instrument [Line Items]                        
Debt instrument, face amount $ 500,000,000                      
Debt instrument, interest rate, stated percentage 4.60%                      
Debt instrument, redemption price, percentage 101.00%                      
0.50% notes 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% | 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%    
364-Day Credit Agreement | Line of Credit | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
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                    
Minimum coverage ration for debt covenant   3.0                    
Repayments of long-term debt     $ 500,000,000                  
364-Day Credit Agreement | Line of Credit | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Debt instrument, basis spread on variable rate   1.625%                    
364-Day Credit Agreement | Line of Credit | Prime Rate | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Debt instrument, basis spread on variable rate   0.625%                    
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     2,200,000,000                 $ 3,500,000,000
Line of credit facility, commitment fee percentage         0.10%              
Ratio of indebtedness to net capital         0.65              
Minimum coverage ration for debt covenant         3.0              
Repayments of long-term debt     $ 500,000,000                  
Amounts borrowed under line of credit           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%              
Accounts Receivable                        
Debt Instrument [Line Items]                        
Proceeds from sale of receivables under arrangements           0 $ 243,000,000          
Outstanding receivables transferred under arrangements           $ 0   $ 30,000,000