Goodwill and intangible assets - Goodwill (Details) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Goodwill [Roll Forward] | |||||
| Beginning balance | $ 16,767,000,000 | $ 16,598,000,000 | |||
| Business realignment | 0 | ||||
| Dispositions | (18,000,000) | ||||
| Foreign currency translation | (36,000,000) | 243,000,000 | |||
| Goodwill | $ 17,411,000,000 | 17,411,000,000 | 17,503,000,000 | $ 17,447,000,000 | $ 17,278,000,000 |
| Accumulated impairment losses | (680,000,000) | (680,000,000) | (680,000,000) | (680,000,000) | (680,000,000) |
| Ending balance | 16,731,000,000 | 16,731,000,000 | 16,823,000,000 | ||
| Goodwill impairment | 0 | ||||
| Securities Services | |||||
| Goodwill [Roll Forward] | |||||
| Beginning balance | 7,388,000,000 | 7,331,000,000 | |||
| Business realignment | (59,000,000) | ||||
| Dispositions | (18,000,000) | ||||
| Foreign currency translation | (17,000,000) | 100,000,000 | |||
| Goodwill | 7,312,000,000 | 7,312,000,000 | 7,413,000,000 | 7,388,000,000 | 7,331,000,000 |
| Accumulated impairment losses | 0 | 0 | 0 | 0 | 0 |
| Ending balance | 7,312,000,000 | 7,312,000,000 | 7,413,000,000 | ||
| Market and Wealth Services | |||||
| Goodwill [Roll Forward] | |||||
| Beginning balance | 1,481,000,000 | 1,475,000,000 | |||
| Business realignment | 59,000,000 | ||||
| Dispositions | 0 | ||||
| Foreign currency translation | (1,000,000) | 9,000,000 | |||
| Goodwill | 1,539,000,000 | 1,539,000,000 | 1,484,000,000 | 1,481,000,000 | 1,475,000,000 |
| Accumulated impairment losses | 0 | 0 | 0 | 0 | 0 |
| Ending balance | 1,539,000,000 | 1,539,000,000 | 1,484,000,000 | ||
| Investment and Wealth Management | |||||
| Goodwill [Roll Forward] | |||||
| Beginning balance | 7,898,000,000 | 7,792,000,000 | |||
| Business realignment | 0 | ||||
| Dispositions | 0 | ||||
| Foreign currency translation | (18,000,000) | 134,000,000 | |||
| Goodwill | 8,560,000,000 | 8,560,000,000 | 8,606,000,000 | 8,578,000,000 | 8,472,000,000 |
| Accumulated impairment losses | (680,000,000) | (680,000,000) | (680,000,000) | $ (680,000,000) | $ (680,000,000) |
| Ending balance | 7,880,000,000 | 7,880,000,000 | $ 7,926,000,000 | ||
| Allocated goodwill | 6,300,000,000 | $ 6,300,000,000 | |||
| Goodwill impairment | $ 0 | ||||
| X | ||||||||||
- Definition Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Fair value portion of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, before accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Includes amount, before amortization expense and impairment loss, of goodwill for private company. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of accumulated impairment loss for asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition Amount of increase (decrease) from transfer into (out of) asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of decrease in goodwill acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized, from divestiture. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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