Other income (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Mar. 31, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Other Income [Line Items] | |||||
| Net gains / (losses) from acquisitions and disposals of subsidiaries | $ 4 | $ 94 | $ (2) | $ 98 | $ (3) |
| Net gains / (losses) from disposals of investments in associates and joint ventures | 0 | 3 | 2 | 3 | 0 |
| Share of net profits of associates and joint ventures | 21 | 136 | 52 | 157 | 110 |
| Total | 25 | 233 | 52 | 257 | 107 |
| Income from properties | 9 | 3 | 15 | 12 | 29 |
| Net gains / (losses) from properties held for sale | (5) | 8 | (2) | 3 | (4) |
| Other | 2 | (31) | 89 | (29) | 145 |
| Total other income | 30 | 213 | 154 | 243 | $ 278 |
| Gains losses on repurchase of entity's own debt instruments | $ (27) | $ (36) | $ 4 | ||
| Swisscard | |||||
| Other Income [Line Items] | |||||
| Share of net profits of associates and joint ventures | 64 | ||||
| Select Portfolio Servicing | |||||
| Other Income [Line Items] | |||||
| Net gains / (losses) from acquisitions and disposals of subsidiaries | $ 97 | ||||