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Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 22, 2021
Mar. 04, 2021
Sep. 29, 2020
Sep. 18, 2020
Mar. 13, 2019
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Debt                  
Proceeds from issuance of debt   $ 1,495,000,000              
Repayments of notes payable             $ 1,326,000,000 $ 400,000,000  
Gain (loss) on extinguishment of debt           $ 6,000,000 168,000,000 $ 6,000,000  
Credit Agreement dated March 13, 2019                  
Debt                  
Borrowing capacity, maximum         $ 1,000,000,000        
Increase in maximum borrowing capacity         $ 500,000,000        
Maximum net leverage ratio         4.0        
Minimum interest coverage ratio         2.5        
Borrowings outstanding             0    
Credit Agreement dated March 13, 2019 | Federal funds effective rate                  
Debt                  
Interest rate, basis spread (as a percent)         0.50%        
Credit Agreement dated March 13, 2019 | Libor rate                  
Debt                  
Interest rate, basis spread (as a percent)         1.00%        
Credit Agreement dated March 13, 2019 | Revolver                  
Debt                  
Borrowing capacity, maximum         $ 500,000,000        
Credit Agreement dated March 13, 2019 | Swingline loans                  
Debt                  
Borrowing capacity, maximum         100,000,000        
Credit Agreement dated March 13, 2019 | Letters of credit                  
Debt                  
Borrowing capacity, maximum         $ 25,000,000        
Letters of credit outstanding, amount             $ 0    
1.5 Notes and Debentures Due February 15, 2028                  
Debt                  
Long-term debt, gross   $ 600,000,000              
Debt instrument stated interest rate   1.50%              
2.0% Notes and Debentures Due February 15, 2031                  
Debt                  
Long-term debt, gross   $ 600,000,000              
Debt instrument stated interest rate   2.00%              
3.125 Notes and Debentures Due February 15, 2051                  
Debt                  
Long-term debt, gross   $ 300,000,000              
Debt instrument stated interest rate   3.125%              
5.95 Notes and Debentures Due March 15, 2022                  
Debt                  
Debt instrument stated interest rate 5.95%                
Repayments of notes payable $ 326,000,000                
4.45 Notes and Debentures Due April 1, 2025                  
Debt                  
Debt instrument stated interest rate 4.45%                
Repayments of notes payable $ 500,000,000                
4.375 Notes and Debentures Due April 1, 2026                  
Debt                  
Debt instrument stated interest rate 4.375%                
Repayments of notes payable $ 500,000,000                
2.0 Notes and Debentures Due October 1 2030 [Member]                  
Debt                  
Long-term debt, gross       $ 300,000,000          
Debt instrument stated interest rate       2.00%          
Proceeds from issuance of debt       $ 300,000,000          
4.5 Notes and Debentures Due May 15 2047 [Member]                  
Debt                  
Long-term debt, gross       $ 100,000,000         $ 300,000,000
Debt instrument stated interest rate       4.50%         4.50%
Proceeds from issuance of debt       $ 119,000,000          
3.5 Notes and Debentures Due April 1 2021 [Member]                  
Debt                  
Debt instrument stated interest rate     3.50%            
Repayments of notes payable     $ 400,000,000