Contingencies (Details) $ in Millions	1 Months Ended
	Nov. 30, 2024 plaintiff	Aug. 31, 2021 plaintiff	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Loss Contingencies [Line Items]
Accrual of loss contingency			$ 53
Estimate of possible loss			65
Unrecognized tax benefits			$ 241	$ 248
Edmar v Currenex
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff		2
State of Texas et al v. Blackrock, Inc. et al
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff	11