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Other assets - Components of Other Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Other Assets [Abstract]
Corporate/bank-owned life insurance	$ 5,606	$ 5,552
Accounts receivable	5,183	4,931
Fails to deliver	3,406	1,292
Tax credit investments	2,888	2,821
Software	2,700	2,676
Prepaid pension assets	2,350	2,035
Equity method investments	928	852
Prepaid expense	833	736
Assets of consolidated investment management funds	826	891
Other equity investments	747	679
Federal Reserve Bank stock	489	478
Income taxes receivable	444	255
Cash collateral receivable on derivative transactions	385	292
Fair value of hedging derivatives	328	781
Seed capital	195	196
Other	1,033	1,223
Total other assets	28,341	25,690
Federal Home Loan Bank stock, at cost	$ 57	$ 57

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Aggregate fair value of all derivative assets designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

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