Restructuring Charges (Summary of Restructuring Plan) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 9	$ 56	$ 15	$ 82
Adenza restructuring
Restructuring Cost and Reserve [Line Items]
Total Program Costs Incurred	86		86
Divisional realignment*
Restructuring Cost and Reserve [Line Items]
Total Program Costs Incurred	139		139
Asset impairment charges \| Adenza restructuring
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0	24	0	24
Asset impairment charges \| Divisional realignment*
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0	4	0	4
Consulting services \| Adenza restructuring
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	1	3	2	3
Consulting services \| Divisional realignment*
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0	11	0	21
Employee-related costs \| Adenza restructuring
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	7	8	11	12
Employee-related costs \| Divisional realignment*
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	0	3	0	6
Other
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	9	56	14	82
Other \| Adenza restructuring
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	1	2	1	5
Other \| Divisional realignment*
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 0	$ 1	$ 0	$ 7

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

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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