Segment Reporting - Narrative (Details) $ in Millions	3 Months Ended
Mar. 31, 2024 USD ($) member segment	Mar. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	3
Total revenues	$ 2,801	$ 2,472
Exchanges Segment
Segment Reporting Information [Line Items]
Total revenues	$ 1,734	1,673
Revenue \| Exchanges Segment \| Customer Concentration Risk
Segment Reporting Information [Line Items]
Number of members \| member	1
Total revenues	$ 157	$ 123
Concentration risk, percentage	13.00%	11.00%

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details