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DEBT
 12 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]  
DEBT DEBT
The carrying value of debt outstanding was as follows at December 31, 2024 and 2023:
20242023
 (in millions)
Short-term debt:
Commercial paper$— $871 
Senior notes:
$600 million, 3.850% due October 1, 2024
— 572 
$600 million, 4.500% due April 1, 2025
577 — 
Total senior notes577 572 
Total short-term debt$577 $1,443 
Long-term debt:
Senior notes:
$600 million, 4.500% due April 1, 2025
$— $598 
$500 million, 5.700% due March 13, 2026
— 498 
$750 million, 1.350% due February 3, 2027
689 688 
$600 million, 3.950% due March 15, 2027
538 537 
$500 million, 5.750% due March 1, 2028
490 495 
$500 million, 5.750% due December 1, 2028
496 495 
$750 million, 3.700% due March 23, 2029
585 590 
$500 million, 3.125% due August 15, 2029
433 433 
$500 million, 4.875% due April 1, 2030
497 496 
$1,250 million, 5.375% due April, 15, 2031
1,226 — 
$750 million, 2.150% due February 3, 2032
744 743 
$750 million, 5.875% due March 1, 2033
726 750 
$850 million, 5.950% due March 15, 2034
806 840 
$250 million, 8.150% due June 15, 2038
260 261 
$400 million, 4.625% due December 1, 2042
366 396 
$750 million, 4.950% due October 1, 2044
714 740 
$400 million, 4.800% due March 15, 2047
392 396 
$500 million, 3.950% due August 15, 2049
505 529 
$750 million, 5.500% due March 15, 2053
705 728 
$1,000 million, 5.750% due April, 15, 2054
972 — 
Total long-term debt$11,144 $10,213 
Maturities of the short-term and long-term debt for the years ending December 31, are as follows:
For the years ending December 31,(in millions)
2025$577 
2026— 
20271,231 
2028993 
20291,025 
Thereafter8,150 

Senior Notes
Our senior notes, which are unsecured, may be redeemed at our option at any time at 100% of the principal amount plus accrued interest and a specified make-whole amount. The 8.150% senior notes are subject to an interest rate adjustment if the debt ratings assigned to the notes are downgraded (or subsequently upgraded). In addition, our senior notes contain a change of control provision that may require us to purchase the notes under certain circumstances.
We repaid the remaining $559 million aggregate principal amount of our 3.850% senior notes on their maturity date of October 1, 2024. In November 2024, we repaid our $500 million 5.700% unsecured senior notes due March 13, 2026.
In March 2024, we issued $1.3 billion of 5.375% unsecured senior notes due April 15, 2031 and $1.0 billion of 5.750% unsecured senior notes due April 15, 2054. Our net proceeds, reduced for the underwriters' discounts and commissions paid, were $2.2 billion. We used the net proceeds for general corporate purposes, which included the repayment of existing indebtedness, including borrowings under our commercial paper program.
We have entered into interest-rate swap agreements with major financial institutions to convert our interest-rate exposure on some of our senior notes payable from fixed rates to variable rates, based on Secured Overnight Financing Rate (SOFR), to align interest costs more closely with floating interest rates received on our cash equivalents and investment securities, as further described in Note 6. As a result, the carrying value of these senior notes has been adjusted to reflect changes in value caused by an increase or decrease in interest rates. The cumulative, aggregate adjustment to the carrying value of the senior notes was a decrease of approximately $129 million at December 31, 2024.
Revolving Credit Agreements
In June 2023, we entered into an amended and restated 5-year, $2.5 billion unsecured revolving credit agreement (replacing the 5-year, $2.5 billion unsecured revolving credit agreement entered in June 2021). In May 2024, we entered into an amendment to increase commitments under the 5-year revolving credit agreement by $0.142 billion resulting in a $2.642 billion borrowing capacity.

In May 2024, we entered into a 364-day $2.1 billion unsecured revolving credit agreement (replacing the 364-day $1.5 billion unsecured revolving credit agreement entered in June 2023, which expired in accordance with its terms).
Under the credit agreements, at our option, we can borrow on either a competitive advance basis or a revolving credit basis. The revolving credit portion bears interest at Term SOFR or the base rate plus a spread. The
competitive advance portion of any borrowings will bear interest at market rates prevailing at the time of borrowing on either a fixed rate or a floating rate based Term SOFR, at our option.
The SOFR spread, currently 114 basis points under the 5-year revolving credit agreement and 116 basis points under the 364-day revolving credit agreement, varies depending on our credit ratings ranging from 92.0 to 130.0 basis points under the 5-year revolving credit agreement and from 94.0 to 135.0 basis points under the 364-day revolving credit agreement. We also pay an annual facility fee regardless of utilization. This facility fee, currently 11.0 basis points, under the 5-year revolving credit agreement and 9.0 basis points under the 364-day revolving agreement, varies depending on our credit ratings ranging from 8.0 to 20.0 basis points under the 5-year revolving credit agreement and from 6.0 to 15.0 basis points under the 364-day revolving credit agreement.
The terms of our revolving credit agreements include standard provisions related to conditions of borrowing which could limit our ability to borrow additional funds. In addition, our credit agreements contain customary restrictive covenants and a financial covenant regarding maximum debt to capitalization of 60%, as well as customary events of default. We are in compliance with this financial covenant, with actual debt to capitalization of 41.9% as measured in accordance with the revolving credit agreements as of December 31, 2024. Upon our agreement with one or more financial institutions, we may expand the aggregate commitments under the revolving credit agreements by up to $500 million, to a maximum of $5.25 billion, across the 5-year and 364-day revolving credit agreements.
At December 31, 2024, we had no borrowings and approximately $18 million of letters of credit outstanding under the revolving credit agreements. Accordingly, as of December 31, 2024, we had $2.624 billion of remaining borrowing capacity under the 5-year revolving credit agreement and $2.1 billion of remaining borrowing capacity under the 364-day revolving credit agreement (which excludes the uncommitted $500 million of incremental loan facilities), none of which would be restricted by our financial covenant compliance requirement.

We have other customary relationships, including financial advisory and banking, with some parties to the revolving credit agreements.
Commercial Paper
Under our commercial paper program we may issue short-term, unsecured commercial paper notes privately placed on a discount basis through certain broker dealers at any time. Amounts available under the program may be borrowed, repaid and re-borrowed from time to time. The net proceeds of issuances have been and are expected to be used for general corporate purposes. The maximum principal amount outstanding at any one time during the year ended December 31, 2024 was $2.7 billion, with none outstanding at December 31, 2024 compared to $871 million outstanding at December 31, 2023.
Other Short-Term Borrowings
We are a member, through one subsidiary, of the Federal Home Loan Bank of Cincinnati, or FHLB. As a member we have the ability to obtain short-term cash advances, subject to certain minimum collateral requirements. In 2023, we received a short-term cash advance of $100 million from FHLB with certain of our marketable securities as collateral and subsequently repaid the outstanding balance in December 2023. At December 31, 2024 we had no outstanding short-term FHLB borrowings.