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Debt and Letters of Credit - Schedule of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Borrowings under credit facility	$ 0	$ 0
Long-term debt	1,070	1,104
Total long-term	$ 1,070	1,104
2028 Notes (4.250% Senior Notes)
Debt Instrument [Line Items]
Interest rate	4.25%
Long-term debt	$ 506	543
Unamortized discount and deferred financing costs	$ (2)	(2)
2029 Notes (1.125% Convertible Senior Notes)
Debt Instrument [Line Items]
Interest rate	1.125%
Long-term debt	$ 575	575
Unamortized discount and deferred financing costs	$ (9)	$ (12)

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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