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Debt (Schedule of Convertible Notes) (Details) - Convertible notes - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Aug. 31, 2022
Long-Term Debt      
Principal $ 322 $ 1,150  
Less: Unamortized debt issuance costs 1 13  
Carrying value 321 1,137  
Contractual interest expense 50 69  
Amortization of debt issuance costs, discounts and premiums 6 8  
Interest expense $ 56 $ 77  
Convertible Senior Notes Due 2025      
Long-Term Debt      
Interest rate     6.00%