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Commitments and contingent liabilities - Narrative (Details) |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 28 Months Ended |  |  |  |  |  |  |  |  |  |
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Sep. 04, 2025 USD ($) | Jul. 30, 2025 USD ($) | Apr. 07, 2025 USD ($) | Aug. 14, 2024 USD ($) | Aug. 24, 2022 claim | Jun. 07, 2022 USD ($) | May 09, 2022 USD ($) | May 20, 2021 USD ($) claim | Sep. 09, 2020 USD ($) director claim | Dec. 17, 2015 claim | Sep. 30, 2025 USD ($) claim | Feb. 28, 2023 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Aug. 21, 2023 investmentFund | Oct. 31, 2022 claim | Dec. 31, 2021 claim | Feb. 28, 2017 claim | May 31, 2016 claim | Dec. 31, 2009 claim | Nov. 30, 2009 claim
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lending commitment maturing in less than one year |  |  |  |  |  |  |  |  |  |  | $ 31,600,000,000 |  |  |  |  |  |  |  |  |  |  |
Lending commitment maturing in one to five years |  |  |  |  |  |  |  |  |  |  | 22,200,000,000 |  |  |  |  |  |  |  |  |  |  |
Lending commitment maturing over five years |  |  |  |  |  |  |  |  |  |  | 266,000,000 |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on lending related commitments |  |  |  |  |  |  |  |  |  |  | $ 63,000,000 |  | $ 70,000,000 | $ 72,000,000 | $ 75,000,000 |  |  |  |  |  |  |
Collateralization percentage generally required for a securities lending transaction with indemnification against broker default |  |  |  |  |  |  |  |  |  |  | 102.00% |  |  |  |  |  |  |  |  |  |  |
Securities lending indemnifications, secured amount of collateral |  |  |  |  |  |  |  |  |  |  | $ 650,000,000,000 |  |  | 574,000,000,000 |  |  |  |  |  |  |  |
Securities lending indemnifications, joint venture |  |  |  |  |  |  |  |  |  |  | 81,000,000,000 |  |  | 60,000,000,000 |  |  |  |  |  |  |  |
Securities lending indemnifications, collateral joint venture |  |  |  |  |  |  |  |  |  |  | 86,000,000,000 |  |  | 64,000,000,000 |  |  |  |  |  |  |  |
Unsettled Repurchase Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsettled repurchase and reverse repurchase agreements |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |
Unsettled Reverse Repurchase Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsettled repurchase and reverse repurchase agreements |  |  |  |  |  |  |  |  |  |  | $ 84,700,000,000 |  |  | 96,100,000,000 |  |  |  |  |  |  |  |
Mortgage-Securitization Trusts Proceedings | Federal Court |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits or class actions (claim) | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Mortgage-Securitization Trusts Proceedings | State Court |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits or class actions (claim) | claim |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  | 2 | 1 |  |  |  |
Matters Related to R. Allen Stanford |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of lawsuits or class actions (claim) | claim |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2 | 1
New claims filed, number (in claims) | claim |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Brazilian Postalis Litigation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New claims filed, number (in claims) | claim |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded, value |  | $ 185,000,000 | $ 3,000,000 |  |  | $ 2,000,000 | $ 20,000,000 | $ 3,000,000 | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investment funds | investmentFund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Damages sought, value |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claims dismissed (claim) | claim |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims settled, number (in claims) | claim |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of liable former Directors | director |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
German Tax Matters | Foreign Tax Authority |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought, value |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |
Off-Channel Business-Related Communications |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded, value | $ 500,000 |  |  | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lawsuits In The Russian Federation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought, value |  |  |  |  |  |  |  |  |  |  | $ 251,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, aggregate range of reasonable loss (up to) |  |  |  |  |  |  |  |  |  |  | 780,000,000 |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standby letters of credit (SBLC) collateralized with cash and securities |  |  |  |  |  |  |  |  |  |  | 218,000,000 |  |  | 173,000,000 |  |  |  |  |  |  |  |
SBLC expiring within one year |  |  |  |  |  |  |  |  |  |  | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |
SBLC expiring within one to five years |  |  |  |  |  |  |  |  |  |  | 453,000,000 |  |  |  |  |  |  |  |  |  |  |
SBLC expiring over five years |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Off-balance sheet credit risks |  |  |  |  |  |  |  |  |  |  | 1,582,000,000 |  |  | 1,641,000,000 |  |  |  |  |  |  |  |
Commercial letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Off-balance sheet credit risks |  |  |  |  |  |  |  |  |  |  | $ 42,000,000 |  |  | $ 24,000,000 |  |  |  |  |  |  |  |

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