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Investments - Summary of Carrying Value of Total Investments (Detail) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Schedule of Investments [Line Items]    
Trading securities (including $3,330 and $2,782 held by CIPs at September 30, 2026 and December 31, 2025, respectively) [1] $ 3,330 $ 2,789
Held-to-maturity investments 468 507
Total debt securities 3,798 3,296
Equity securities at FVTNI (including $2,200 and $1,681 held by CIPs at September 30, 2026 and December 31, 2025, respectively) [1] 3,181 2,282
Total equity method investments 2,569 2,133
CLOs held at fair value 537 568
Total investments [2] 15,384 13,271
Location, Statement of Financial Position, Balance [Axis]: us-gaap:Investments    
Schedule of Investments [Line Items]    
Total investments [3] 1,521 1,195
Equity Method Investments [Member]    
Schedule of Investments [Line Items]    
Total equity method investments [4] 2,114 1,833
Deferred Cash Compensation Plans [Member]    
Schedule of Investments [Line Items]    
Total equity method investments [1] 455 300
Federal Reserve Bank Stock [Member]    
Schedule of Investments [Line Items]    
Total investments [5] 88 87
Consolidated Entities [Member] | Carried Interest [Member]    
Schedule of Investments [Line Items]    
Total investments [6] $ 3,690 $ 3,710
[1] Amounts include investments held to economically hedge the impact of market valuation changes on certain deferred cash compensation plans. Amounts related to deferred cash compensation plans included within debt securities comprised $27 million as of September 30, 2026, and amounts included within equity securities held at fair value recorded through net income ("FVTNI") comprised $13 million and $37 million at September 30, 2026 and December 31, 2025, respectively.
[2] At September 30, 2026, cash and cash equivalents, investments, other assets and other liabilities include $306 million, $9.1 billion, $63 million and $3.8 billion, respectively, related to consolidated variable interest entities (“VIEs”). At December 31, 2025, cash and cash equivalents, investments, other assets and other liabilities include $428 million, $8.5 billion, $76 million and $4.1 billion, respectively, related to consolidated VIEs.
[3] Other investments include private equity, private credit, real asset, commodity, and digital asset investments held by CIPs, which are measured at fair value.
[4] Equity method investments include BlackRock’s direct investments in certain BlackRock sponsored investment funds.
[5] Federal Reserve Bank stock is held for regulatory purposes and is restricted from sale.
[6] Carried interest represents allocations to BlackRock’s general partner capital accounts from certain sponsored investment funds. These balances are subject to change upon cash distributions, additional allocations or reallocations back to limited partners within the respective funds.