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Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) ("AOCL") by Component (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items]      
AOCL, Beginning Balance $ (14) $ (21)  
Other comprehensive (loss) income before reclassifications 2 7  
Amounts reclassified from AOCL 2    
Other comprehensive income (loss) 4 7 $ (7)
AOCL, Ending Balance (10) (14) (21)
Change in Fair Value of Available for Sale Debt Securities      
Accumulated Other Comprehensive Income Loss [Line Items]      
AOCL, Beginning Balance (13) (19)  
Other comprehensive (loss) income before reclassifications   6  
Other comprehensive income (loss)   6  
AOCL, Ending Balance (13) (13) (19)
Change in Unrecognized Pension Cost Components      
Accumulated Other Comprehensive Income Loss [Line Items]      
AOCL, Beginning Balance (1) (2)  
Other comprehensive (loss) income before reclassifications 2 1  
Amounts reclassified from AOCL 2    
Other comprehensive income (loss) 4 1  
AOCL, Ending Balance $ 3 $ (1) $ (2)