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Debt
 3 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
Debt Debt
 
Debt consisted of the following (in millions):

March 31,
2024		December 31,
2023
SHORT-TERM DEBT  
Commercial paper notes, bearing a weighted-average interest rate of 5.7% and 5.8%, respectively (1)
$540 $433 
Other14 13 
Total short-term debt554 446 
LONG-TERM DEBT
Senior notes, net of unamortized discounts and debt issuance costs of $39 and $41, respectively (2)
7,244 7,242 
Other64 63 
Total long-term debt7,308 7,305 
Total debt (3)
$7,862 $7,751 
(1)We classified these commercial paper notes as short-term as of March 31, 2024 and December 31, 2023, as these notes were primarily designated as working capital borrowings, were required to be repaid within one year and were primarily for hedged NGL and crude oil inventory and NYMEX and ICE margin deposits.
(2)As of March 31, 2024 and December 31, 2023, we classified our $750 million, 3.60% senior notes due November 2024 as long-term based on our ability and intent to refinance these notes on a long-term basis.
(3)Our fixed-rate senior notes had a face value of approximately $7.3 billion as of March 31, 2024 and December 31, 2023. We estimated the aggregate fair value of these notes as of March 31, 2024 and December 31, 2023 to be approximately $6.9 billion. Our fixed-rate senior notes are traded among institutions, and these trades are routinely published by a reporting service. Our determination of fair value is based on reported trading activity near the end of the reporting period. We estimate that the carrying value of outstanding borrowings under our commercial paper program approximates fair value as interest rates reflect current market rates. The fair value estimates for our senior notes and commercial paper program are based upon observable market data and are classified in Level 2 of the fair value hierarchy.

Borrowings and Repayments
 
Total borrowings under our credit facilities and commercial paper program for the three months ended March 31, 2024 and 2023 were approximately $9.1 billion and $1.5 billion, respectively. Total repayments under our credit facilities and commercial paper program were approximately $9.0 billion and $1.5 billion for the three months ended March 31, 2024 and 2023, respectively. The variance in total gross borrowings and repayments is impacted by various business and financial factors including, but not limited to, the timing, average term and method of general partnership borrowing activities.

Letters of Credit
 
In connection with our merchant activities, we provide certain suppliers with irrevocable standby letters of credit to secure our obligation for the purchase and transportation of crude oil and NGL. Additionally, we issue letters of credit to support insurance programs, derivative transactions, including hedging-related margin obligations, and construction activities. At March 31, 2024 and December 31, 2023, we had outstanding letters of credit of $161 million and $205 million, respectively.