Fair Value Measurements - Difference Between Fair Values Fair Value Option (Details) - Fair Value Option - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Fair Value	$ 68	$ 53
Outstanding Principal Amount	60	44
Difference	$ 8	$ 9

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

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