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Fair Value (Tables) | 12 Months Ended
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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, 2023 |  | December 31, 2022
| Carrying |  | Fair Value |  | Carrying |  | Fair Value
| Amount |  | Level 1 |  | Level 2 |  | Level 3 |  | Amount |  | Level 1 |  | Level 2 |  | Level 3
| (millions)
Cash equivalents (a) | $ | 36 |  |  | $ | — |  |  | $ | 36 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Long-term notes receivable — related party | 4 |  |  | — |  |  | — |  |  | 4 |  |  | 4 |  |  | — |  |  | — |  |  | 4 |
Short-term borrowings (a) | 165 |  |  | — |  |  | 165 |  |  | — |  |  | 330 |  |  | — |  |  | 330 |  |  | — |
Long-term debt (b) | $ | 3,065 |  |  | $ | — |  |  | $ | 2,850 |  |  | $ | — |  |  | $ | 3,059 |  |  | $ | — |  |  | $ | 2,701 |  |  | $ | — |
______________________________________ (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.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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