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Debt and Letters of Credit - Schedule of Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Financing Arrangements    
Borrowings under credit facility $ 0 $ 0
Long-term debt 1,136 1,158
Total debt $ 1,136 1,158
2028 Notes ($4.250% Senior Notes)    
Financing Arrangements    
Debt instrument, interest rate, stated percentage 4.25%  
Long-term debt $ 576 600
Unamortized discount and deferred financing costs $ (2) (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)