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Segment Reporting - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
operating_segment
Jun. 30, 2023
USD ($)
operating_segment
Jun. 30, 2024
USD ($)
segment
operating_segment
Jun. 30, 2023
USD ($)
operating_segment
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     3  
Total revenues $ 2,897 $ 2,336 $ 5,698 $ 4,808
Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues $ 1,826 $ 1,541 $ 3,560 $ 3,214
Revenue | Exchanges Segment | Customer Concentration Risk        
Segment Reporting Information [Line Items]        
Number of members | operating_segment 1 1 1 1
Total revenues $ 117 $ 130 $ 274 $ 254
Concentration risk, percentage 9.00% 12.00% 11.00% 12.00%