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Debt and Letters of Credit - Schedule of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Financing Arrangements
Borrowings under credit facility	$ 0	$ 0
Long-term debt	1,149	1,158
Total debt	$ 1,149	1,158
2028 Notes ($4.250% Senior Notes)
Financing Arrangements
Debt instrument, interest rate, stated percentage	4.25%
Long-term debt	$ 590	600
Unamortized discount and deferred financing costs	$ (3)	(3)
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	$ (13)	$ (14)

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