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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Fair value measurements
Cash, cash equivalents, and reserved funds, carrying value	$ 695	$ 987
Long-term debt	1,900	1,900
Level 1
Fair value measurements
Cash, cash equivalents, and reserved funds, fair value	695	987
Level 2
Fair value measurements
Long-term debt, fair value	$ 1,500	$ 1,500

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- Definition

Cash, Cash Equivalents, and Reserved Funds, Carrying Value

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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