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Investments (Details) - USD ($)	3 Months Ended
Investments (Details) - USD ($)	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Aug. 12, 2024
Schedule of Equity Method Investments [Line Items]
Net (income)/losses from unconsolidated investees	$ (29,000,000)	$ 42,000,000
Revolving Credit Facility
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity	3,900,000,000
Revolving Credit Facility \| Line of Credit \| Bakkt Credit Facility
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity	20,000,000			$ 40,000,000
Long-term debt	5,000,000
Options Clearing Corporation
Schedule of Equity Method Investments [Line Items]
Net (income)/losses from unconsolidated investees	$ (29,000,000)	$ 42,000,000
Ownership percentage	40.00%
Bakkt
Schedule of Equity Method Investments [Line Items]
Ownership percentage			54.00%
Fair value of investments	$ 65,000,000