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Financing Arrangements - Narrative (Details)
9 Months Ended
May 07, 2020
USD ($)
Mar. 13, 2020
USD ($)
Feb. 21, 2020
USD ($)
Sep. 27, 2017
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Apr. 29, 2021
USD ($)
Apr. 26, 2021
USD ($)
Dec. 31, 2020
USD ($)
Apr. 27, 2020
USD ($)
Feb. 21, 2020
EUR (€)
Aug. 06, 2019
USD ($)
Debt Instrument [Line Items]                        
Outstanding borrowings         $ 4,961,000,000       $ 5,059,000,000      
Repayments of long-term debt         300,000,000 $ 568,000,000            
Amounts borrowed under line of credit         300,000,000 1,031,000,000            
Letter of Credit Subfacility Maturing 2022                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity         197,000,000       206,000,000      
2.400% notes maturing 2031 | Senior Notes                        
Debt Instrument [Line Items]                        
Debt instrument, face amount             $ 300,000,000          
Debt instrument, interest rate, stated percentage             2.40%          
4.850% notes maturing 2021 | Senior Notes                        
Debt Instrument [Line Items]                        
Debt instrument, face amount               $ 300,000,000        
Debt instrument, interest rate, stated percentage               4.85%        
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%                  
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%                
364-Day Credit Agreement | Line of Credit | Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity                   $ 500,000,000    
Outstanding borrowings               $ 0        
Repayments of long-term debt   $ 500,000,000                    
Accounts Receivable                        
Debt Instrument [Line Items]                        
Proceeds from sale of receivables under arrangements         0 $ 564,000,000            
Outstanding receivables transferred under arrangements         $ 0       $ 30,000,000