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Debt and Letters of Credit - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Financing Arrangements
Borrowings under credit facility	$ 0	$ 0
Long-term debt	1,070	1,104
Total debt	$ 1,070	1,104
2028 Notes (4.250% Senior Notes)
Financing Arrangements
Debt instrument, interest rate, stated percentage	4.25%
Long-term debt	$ 507	543
Unamortized discount and deferred financing costs	$ (2)	(2)
2029 Notes (1.125% Convertible Senior Notes)
Financing Arrangements
Debt instrument, interest rate, stated percentage	1.125%
Long-term debt	$ 575	575
Unamortized discount and deferred financing costs	$ (10)	$ (12)

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