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Fair Value (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Carrying Amount of Fair Value of Financial Instruments
The following table presents the carrying amount and fair value of financial instruments:
December 31, 2023December 31, 2022
CarryingFair ValueCarryingFair Value
AmountLevel 1Level 2Level 3AmountLevel 1Level 2Level 3
(millions)
Cash equivalents (a)
$36 $ $36 $ $— $— $— $— 
Long-term notes receivable — related party4   4 — — 
Short-term borrowings (a)
165  165  330 — 330 — 
Long-term debt (b)
$3,065 $ $2,850 $ $3,059 $— $2,701 $— 
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(a)Short-term borrowings and money market cash equivalents are stated at cost, which approximates fair value.
(b)Carrying value represents principal of $3,099 million, net of unamortized debt discounts and issuance costs.