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Investments (Details) - USD ($)	3 Months Ended		9 Months Ended
Investments (Details) - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Aug. 12, 2024	Feb. 29, 2024	Dec. 31, 2023
Schedule of Equity Method Investments [Line Items]
Net losses from unconsolidated investees			$ 63,000,000	$ 91,000,000
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					$ 40,000,000
Long-term debt	0		0
Options Clearing Corporation
Schedule of Equity Method Investments [Line Items]
Net losses from unconsolidated investees	$ 18,000,000	$ 26,000,000	$ 63,000,000	$ 91,000,000
Ownership percentage	40.00%		40.00%
Bakkt
Schedule of Equity Method Investments [Line Items]
Ownership percentage	55.00%		55.00%				64.00%
Aggregate cost						$ 10,000,000
Fair value of investments	$ 71,000,000		$ 71,000,000