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Segment Reporting - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
operating_segment
Sep. 30, 2023
USD ($)
operating_segment
Sep. 30, 2024
USD ($)
operating_segment
segment
Sep. 30, 2023
USD ($)
operating_segment
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     3  
Total revenues $ 3,033 $ 2,429 $ 8,731 $ 7,237
Exchanges Segment        
Segment Reporting Information [Line Items]        
Total revenues $ 1,938 $ 1,540 $ 5,498 $ 4,754
Revenue | Exchanges Segment | Customer Concentration Risk        
Segment Reporting Information [Line Items]        
Number of members | operating_segment 1 1 1 1
Total revenues $ 112 $ 140 $ 386 $ 394
Concentration risk, percentage 9.00% 13.00% 10.00% 12.00%