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Debt
3 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
Debt Debt
Short-Term Debt
We have a debt financing program of up to $10.0 billion through the issuance of commercial paper. Net proceeds from this program are used for general corporate purposes. We had no commercial paper outstanding as of December 31, 2023 and March 31, 2024.
Our short-term debt balance also includes the current portion of certain long-term debt.
Long-Term Debt
Total outstanding debt is summarized below (in millions, except percentages):
MaturityCoupon RateEffective Interest RateAs of December 31, 2023As of
March 31, 2024
Debt
2016-2020 Notes issuances2025 - 2060
0.45% - 2.25%
0.57% - 2.33%
$13,000 $12,000 
Future finance lease payments, net and other (1)
1,746 1,672 
      Total debt14,746 13,672 
Unamortized discount and debt issuance costs(130)(127)
Less: Current portion of long-term notes(2)
(1,000)
Less: Current portion of future finance lease payments, net and other current debt(1)(2)
(363)(317)
       Total long-term debt$13,253 $13,228 
(1)Future finance lease payments are net of imputed interest.
(2)Total current portion of long-term debt is included within other accrued expenses and current liabilities. See Note 6 for further details.
The notes in the table above are fixed-rate senior unsecured obligations and rank equally with each other. We may redeem the notes at any time in whole or in part at specified redemption prices. The effective interest rates are based on proceeds received with interest payable semi-annually.
The total estimated fair value of the outstanding notes was approximately $10.3 billion and $9.0 billion as of December 31, 2023 and March 31, 2024, respectively. The fair value was determined based on observable market prices of identical instruments in less active markets and is categorized accordingly as Level 2 in the fair value hierarchy.
Credit Facility
As of March 31, 2024, we had $10.0 billion of revolving credit facilities, of which $4.0 billion expires in April 2024 and $6.0 billion expires in April 2028. In April 2024, we entered into a new $4.0 billion revolving credit facility expiring in April 2025. The interest rates for all credit facilities are determined based on a formula using certain market rates, as well as our progress toward the achievement of certain sustainability goals. No amounts were outstanding under the credit facilities as of December 31, 2023 and March 31, 2024.