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Investments (Details) - USD ($)	3 Months Ended		6 Months Ended
Investments (Details) - USD ($)	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Aug. 12, 2024
Schedule of Equity Method Investments [Line Items]
Net (income)/losses from unconsolidated investees			$ (35,000,000)	$ 45,000,000
Gain on sale of investments	$ 2,000,000		2,000,000
Revolving Credit Facility
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity	3,900,000,000		3,900,000,000
Revolving Credit Facility \| Line of Credit \| Bakkt Credit Facility
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity	30,000,000		30,000,000			$ 40,000,000
Options Clearing Corporation
Schedule of Equity Method Investments [Line Items]
Net (income)/losses from unconsolidated investees	$ (6,000,000)	$ 3,000,000	$ (35,000,000)	$ 45,000,000
Ownership percentage	40.00%		40.00%
Bakkt
Schedule of Equity Method Investments [Line Items]
Ownership percentage	53.00%		53.00%		53.00%
Fair value of investments	$ 104,000,000		$ 104,000,000