Contingencies (Details) $ in Millions	1 Months Ended
	Nov. 30, 2024 plaintiff defendant	Aug. 31, 2021 plaintiff	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Loss Contingencies [Line Items]
Accrual of loss contingency			$ 5
Estimate of possible loss			45
Unrecognized tax benefits			$ 239	$ 237
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
Defendants | defendant	3