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Debt and Credit Facilities (Maturities Of Long-Term Debt Disclosures) (Details) - USD ($)
Dec. 31, 2020
Nov. 30, 2020
Jun. 30, 2020
Jan. 15, 2020
Dec. 31, 2019
Other long-term debt $ 16,000,000       $ 26,000,000
Total debt 13,991,000,000       11,090,000,000
Current maturities of debt 761,000,000       859,000,000
Total long-term debt 13,230,000,000       10,231,000,000
Unamortized debt issuance costs 71,000,000       58,000,000
Borrowing capacity on existing facilities 2,903,000,000       1,546,000,000
Fair value of senior unsecured notes $ 15,022,000,000       11,910,000,000
Senior Unsecured Notes 4.375% due 2020          
Stated interest rate 4.375%     4.375%  
Unsecured debt $ 0       500,000,000
Senior Unsecured Notes, Variable, due 2020          
Unsecured debt $ 0       333,000,000
Senior Unsecured Notes 2.625% due 2021          
Stated interest rate 2.625%        
Unsecured debt $ 750,000,000       749,000,000
Senior Unsecured Notes, 1.125%, due 2023          
Stated interest rate 1.125%        
Unsecured debt $ 668,000,000       609,000,000
Senior Unsecured Notes 0.600% due 2023          
Stated interest rate 0.60% 0.60%      
Unsecured debt $ 597,000,000       0
Senior Unsecured Notes 3.375% due 2024          
Stated interest rate 3.375%        
Unsecured debt $ 590,000,000       587,000,000
Senior Unsecured Notes 0.250% due 2024          
Stated interest rate 0.25%        
Unsecured debt $ 1,030,000,000       938,000,000
Senior Unsecured Notes, 1.150% Due 2025          
Stated interest rate 1.15%   1.15%    
Unsecured debt $ 644,000,000       0
Senior Unsecured Notes 3.375% due 2025          
Stated interest rate 3.375%        
Unsecured debt $ 747,000,000       746,000,000
Senior Unsecured Notes 3.50% due 2026          
Stated interest rate 3.50%        
Unsecured debt $ 992,000,000       991,000,000
Senior Unsecured Notes,2.125%, due 2027          
Stated interest rate 2.125%        
Unsecured debt $ 909,000,000       829,000,000
Senior Unsecured Notes 3.650% due 2028          
Stated interest rate 3.65%        
Unsecured debt $ 596,000,000       596,000,000
Senior Unsecured Notes 0.750% due 2029          
Stated interest rate 0.75%        
Unsecured debt $ 969,000,000       884,000,000
Senior Unsecured Notes, 1.950% Due 2030          
Stated interest rate 1.95%   1.95%    
Unsecured debt $ 989,000,000       0
Senior Unsecured Notes, 2.625% due 2030          
Stated interest rate 2.625%        
Unsecured debt $ 782,000,000       712,000,000
Senior Unsecured Notes 1.000% due 2031          
Stated interest rate 1.00%        
Unsecured debt $ 903,000,000       823,000,000
Senior Unsecured Notes 4.10% due 2043          
Stated interest rate 4.10%        
Unsecured debt $ 392,000,000       391,000,000
Senior Unsecured Notes 4.375% due 2044          
Stated interest rate 4.375%        
Unsecured debt $ 395,000,000       395,000,000
Senior Unsecured Notes 4.625% due 2046          
Stated interest rate 4.625%        
Unsecured debt $ 981,000,000       981,000,000
Senior Unsecured Notes, 2.900% due 2050          
Stated interest rate 2.90%   2.90%    
Unsecured debt $ 641,000,000       0
Term Loan          
Long-term debt $ 400,000,000 $ 400,000,000     $ 0