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Revenues - Schedule of Revenues Disaggregated by Geographic Area (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenues $ 1,404 $ 1,258
U.S.    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenues 1,174 1,099
U.K.    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenues 140 131
Other    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenues $ 90 $ 28