This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments - Narrative (Details) € in Millions		3 Months Ended
Investments - Narrative (Details) € in Millions	Oct. 18, 2021 EUR (€)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Oct. 15, 2021
Euroclear
Schedule of Equity Method Investments [Line Items]
Ownership percentage	9.80%	9.80%
Original investment		$ 631,000,000
Carrying value of investments		701,000,000
Proceeds from sale of equity method investment \| €	€ 709
Dividend income		$ 0	$ 30,000,000
Options Clearing Corporation
Schedule of Equity Method Investments [Line Items]
Ownership percentage		40.00%
Gain (loss) on equity method investments		$ 42,000,000	$ 25,000,000
Bakkt
Schedule of Equity Method Investments [Line Items]
Ownership percentage		68.00%		68.00%
Carrying value of investments		$ 1,500,000,000