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Debt and Credit Facilities
 3 Months Ended
Mar. 31, 2021
Long-term Debt, Unclassified [Abstract]  
Debt And Credit Facilities DEBT AND CREDIT FACILITIES
We have lines of credit issued by various financial institutions that are available to fund our day-to-day operating needs. Certain of our credit facilities require us to comply with financial and other covenants. We were in compliance with all covenants on March 31, 2021.
Our commercial paper program backed by our primary revolving credit facility which expires in August 2023 allows us to have a maximum of $1,500 in commercial paper outstanding with maturities up to 397 days from the date of issuance. We have a credit agreement that provides for up to $1,500 of borrowings in United States Dollars pursuant to a 364-day revolving credit facility, which matures on April 29, 2021 and is available for working capital and general corporate purposes. On March 31, 2021 there were no borrowings outstanding under our credit facility or commercial paper programs.
Summary of Total DebtMarch 2021December 2020
RateDue
Senior unsecured notes:
2.625%March 15, 2021$— $750 
1.125%November 30, 2023646 668 
0.600%December 1, 2023597 597 
3.375%May 15, 2024591 590 
0.250%December 3, 2024995 1,030 
1.150%June 15, 2025645 644 
3.375%November 1, 2025747 747 
3.500%March 15, 2026993 992 
2.125%November 30, 2027878 909 
3.650%March 7, 2028596 596 
0.750%March 1, 2029937 969 
1.950%June 15, 2030989 989 
2.625%November 30, 2030756 782 
1.000%December 3, 2031873 903 
4.100%April 1, 2043392 392 
4.375%May 15, 2044395 395 
4.625%March 15, 2046982 981 
2.900%June 15, 2050641 641 
Variable term loanNovember 10, 2023400 400 
Other21 16 
Total debt$13,074 $13,991 
Less current maturities of debt15 761 
Total long-term debt$13,059 $13,230 
March 2021December 2020
Unamortized debt issuance costs$69 $71 
Borrowing capacity on existing facilities$2,908 $2,903 
Fair value of senior unsecured notes$13,634 $15,022 
The fair value of the senior unsecured notes was estimated using quoted interest rates, maturities and amounts of borrowings based on quoted active market prices and yields that took into account the underlying terms of the debt instruments. Substantially all of our debt is classified within Level 2 of the fair value hierarchy.
In March 2021 we repaid $750 of senior unsecured notes with a coupon of 2.625% that were due on March 15, 2021.