v3.26.3
Goodwill and Acquired Intangible Assets (Finite-Lived Intangible Assets) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Intangible Asset, Finite-Lived [Line Items]    
Gross Amount $ 7,102 $ 7,175
Accumulated Amortization (2,203) (1,903)
Net Amount 4,899 5,272
Total indefinite-lived intangible assets 1,207 1,239
Total intangible assets, net 6,106 6,511
Exchange and clearing registrations    
Intangible Asset, Finite-Lived [Line Items]    
Total indefinite-lived intangible assets 1,257 1,257
Trade names    
Intangible Asset, Finite-Lived [Line Items]    
Total indefinite-lived intangible assets 121 121
Licenses    
Intangible Asset, Finite-Lived [Line Items]    
Total indefinite-lived intangible assets 50 52
Foreign currency translation adjustment    
Intangible Asset, Finite-Lived [Line Items]    
Total indefinite-lived intangible assets (221) (191)
Technology    
Intangible Asset, Finite-Lived [Line Items]    
Gross Amount 1,222 1,222
Accumulated Amortization (673) (531)
Net Amount 549 691
Customer relationships    
Intangible Asset, Finite-Lived [Line Items]    
Gross Amount 5,645 5,711
Accumulated Amortization (1,584) (1,432)
Net Amount 4,061 4,279
Trade names and other    
Intangible Asset, Finite-Lived [Line Items]    
Gross Amount 405 405
Accumulated Amortization (68) (53)
Net Amount 337 352
Foreign currency translation adjustment    
Intangible Asset, Finite-Lived [Line Items]    
Gross Amount (170) (163)
Accumulated Amortization 122 113
Net Amount $ (48) $ (50)