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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Fair value measurements
Cash, cash equivalents, and reserved funds, carrying value	$ 670	$ 987
Long-term debt	1,800	1,900
Level 1
Fair value measurements
Cash, cash equivalents, and reserved funds, fair value	670	987
Level 2
Fair value measurements
Long-term debt, fair value	$ 1,600	$ 1,500

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- Definition

Cash, Cash Equivalents, and Reserved Funds, Carrying Value

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

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