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Derivative instruments - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Counterparty default losses recorded | $ 0 |  |  |  |  |
Value-at-risk methodology assumed holding period for instruments |  |  |  | 1 day |  |
Value-at-risk methodology confidence level percentage |  |  |  | 99.00% |  |
Gain or (loss) recognized in income on derivatives | (3,000,000) | $ (1,000,000) | $ (1,000,000) | $ (7,000,000) | $ 5,000,000 |
Additional collateral The Bank of New York Mellon would have to post for existing collateral arrangements, if The Bank of New York Mellon had fallen below investment grade | 61,000,000 |  |  | 61,000,000 |  | $ 351,000,000
Fair value hedging | Loans |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Interest rate swaps designated as portfolio layer method fair value hedges of loans | 3,000,000,000 |  |  | 3,000,000,000 |  | 3,200,000,000
Fair value hedging | Securities – Available-for-sale |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Interest rate swaps designated as portfolio layer method fair value hedges of loans | 14,300,000,000 |  |  | 14,300,000,000 |  | 12,100,000,000
Interest rate swap | Fair value hedging | Loans |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Interest rate swaps designated as portfolio layer method fair value hedges of loans | 1,400,000,000 |  |  | 1,400,000,000 |  |
Foreign exchange contracts | Forecasted Foreign Currency |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Gain (loss) to be reclassified in next 12 months from AOCI to earnings |  |  |  | (16,000,000) |  |
Foreign exchange contracts | Cash flow hedges | Forecasted Foreign Currency |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Hedged financial instruments, notional amount of derivative | 760,000,000 |  |  | $ 760,000,000 |  |
Original maturities, maximum, of hedged instruments |  |  |  | 15 months |  |
Pre-tax gain (loss) recognized in OCI related to cash flow hedges |  |  |  | $ (16,000,000) |  |
Foreign exchange contracts | Net investment hedging |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Hedged financial instruments, notional amount of derivative | $ 10,700,000,000 |  |  | $ 10,700,000,000 |  |
Foreign Exchange Forward |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Hedging derivatives, maturities, maximum | 1 year |  |  | 1 year |  |
Securities – Available-for-sale | Interest rate swap |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Hedged financial instruments | $ 35,200,000,000 |  |  | $ 35,200,000,000 |  |
Hedged financial instruments, notional amount of derivative | 35,000,000,000.0 |  |  | 35,000,000,000.0 |  |
Long-term debt | Interest rate swap |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Hedged financial instruments | 29,800,000,000 |  |  | 29,800,000,000 |  |
Hedged financial instruments, notional amount of derivative | 29,800,000,000 |  |  | $ 29,800,000,000 |  |
Original maturities, minimum, of hedged instruments |  |  |  | 5 years |  |
Original maturities, maximum, of hedged instruments |  |  |  | 30 years |  |
Not Designated as Hedging Instrument, Economic Hedge | Equity Swap |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Gain or (loss) recognized in income on derivatives | 12,000,000 | $ 15,000,000 | $ 11,000,000 | $ 19,000,000 | $ 22,000,000 |
Designated as hedging | Fair value hedging | Loans |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Interest rate swaps designated as portfolio layer method fair value hedges of loans | 1,400,000,000 |  |  | 1,400,000,000 |  | 1,400,000,000
Designated as hedging | Fair value hedging | Securities – Available-for-sale |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Interest rate swaps designated as portfolio layer method fair value hedges of loans | 6,800,000,000 |  |  | 6,800,000,000 |  | 6,200,000,000
Designated as hedging | Foreign exchange contracts |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosure [Line Items] |  |  |  |  |  |
Hedged financial instruments, notional amount of derivative | $ 11,506,000,000 |  |  | $ 11,506,000,000 |  | $ 12,048,000,000

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- Definition The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 185 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-185 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4H -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4H + Details
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