Goodwill and Acquired Intangible Assets (Schedule of Changes in Goodwill) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2026 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 14,371
Foreign currency translation adjustments	(126)
Balance at end of period	14,245
Capital Access Platforms
Goodwill [Roll Forward]
Balance at beginning of period	4,285
Foreign currency translation adjustments	(53)
Balance at end of period	4,232
Financial Technology
Goodwill [Roll Forward]
Balance at beginning of period	7,952
Foreign currency translation adjustments	(8)
Balance at end of period	7,944
Market Services
Goodwill [Roll Forward]
Balance at beginning of period	2,134
Foreign currency translation adjustments	(65)
Balance at end of period	$ 2,069