Investments - Summary of Carrying Value of Total Investments (Detail) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Trading securities (including $1,884 and $1,743 held by CIPs at March 31, 2025 and December 31, 2024, respectively)		$ 1,964	$ 1,823
Held-to-maturity investments		530	547
Total debt securities		2,494	2,370
Equity securities at FVTNI (including $1,737 and $1,556 held by CIPs at March 31, 2025 and December 31, 2024, respectively)		2,208	1,950
Total equity method investments		2,833	2,783
Loans held By CIPs		119	145
Total investments	[1]	10,525	9,769
Other Investments [Member]
Schedule of Investments [Line Items]
Total investments		791	445
Equity Method Investments [Member]
Schedule of Investments [Line Items]
Total equity method investments		2,568	2,610
Deferred Cash Compensation Plans [Member]
Schedule of Investments [Line Items]
Total equity method investments		265	173
Federal Reserve Bank Stock [Member]
Schedule of Investments [Line Items]
Total investments		93	93
Consolidated Entities [Member] | Carried Interest [Member]
Schedule of Investments [Line Items]
Total investments		$ 1,987	$ 1,983

[1] At March 31, 2025, cash and cash equivalents, investments, other assets and other liabilities include $282 million, $5.5 billion, $77 million and $2.1 billion, respectively, related to consolidated variable interest entities (“VIEs”). At December 31, 2024, cash and cash equivalents, investments, other assets and other liabilities include $125 million, $5.1 billion, $45 million and $2.1 billion, respectively, related to consolidated VIEs.