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Fair Value of Financial Instruments Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Surrender Value, Fair Value Disclosure | $ 32 | $ 30
Long-term Debt | 4,433 | 3,985
Unamortized Debt Issuance Expense | 15 | 14
Long-term Debt, Fair Value | $ 3,457 | $ 3,705

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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References No definition available. + Details
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