Variable interest entities - Assets and Liabilities of VIEs (Details) - USD ($) |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Variable Interest Entity [Line Items] | ||
| Trading assets | $ 16,836,000,000 | $ 14,276,000,000 |
| Other assets | 2,125,000,000 | 1,666,000,000 |
| Other liabilities | 662,000,000 | 617,000,000 |
| Nonredeemable noncontrolling interests | 600,000,000 | 408,000,000 |
| Variable Interest Entity, Primary Beneficiary | ||
| Variable Interest Entity [Line Items] | ||
| Trading assets | 1,091,000,000 | 841,000,000 |
| Other assets | 45,000,000 | 23,000,000 |
| Total assets | 1,136,000,000 | 864,000,000 |
| Other liabilities | 27,000,000 | 1,000,000 |
| Total liabilities | 27,000,000 | 1,000,000 |
| Nonredeemable noncontrolling interests | 600,000,000 | 408,000,000 |
| Voting Model Entity, Primary Beneficiary | ||
| Variable Interest Entity [Line Items] | ||
| VME classification of carrying amount, assets | 61,000,000 | 0 |
| VME classification of carrying amounts, liabilities | 1,000,000 | 0 |
| Noncontrolling interest in VME | $ 1,000,000 | $ 0 |
| X | ||||||||||
- Definition Portion of equity (net assets) in a voting model entity not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a voting interest entity that is attributable to the noncontrolling interest (previously referred to as minority interest). No definition available.
|
| X | ||||||||||
- Definition Balance sheet classification of the voting model entity's liabilities included in the statement of financial position of the reporting entity. This element is applicable for voting interest interests whether the reporting entity has a controlling financial interest (primary beneficiary) or not. No definition available.
|
| X | ||||||||||
- Definition Balance sheet classification of the voting model entity's assets included in the statement of financial position of the reporting entity. This element is applicable for voting interests whether the reporting entity has a controlling financial interest (primary beneficiary) or not. No definition available.
|
| X | ||||||||||
- Definition Fair value portion of asset recognized for present right to economic benefit. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Fair value of financial and nonfinancial obligations. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of equity (deficit) attributable to noncontrolling interest. Excludes temporary equity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Fair value portion of other assets. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Fair value portion of other liabilities. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|