Changes in organization and acquisitions and disposals of subsidiaries and businesses (Narrative) (Detail) $ in Millions	12 Months Ended
Dec. 31, 2024 USD ($)
Disclosure Of Changes In Organisation [Line Items]
Assets of disposal groups held for sale	$ 1,705
Liabilities of disposal group held for sale	$ 1,199
Swisscard AECS GmbH
Disclosure Of Changes In Organisation [Line Items]
Proportion of ownership interest in joint venture	50.00%
Expense in connection with the termination of the Swisscard joint venture	$ 41
Swisscard AECS GmbH \| Credit Suisse
Disclosure Of Changes In Organisation [Line Items]
Proportion of ownership interest in joint venture	50.00%
Select Portfolio Servicing
Disclosure Of Changes In Organisation [Line Items]
Assets of disposal groups held for sale	$ 1,705
Liabilities of disposal group held for sale	$ 1,199

The amount of liabilities included in disposal groups classified as held for sale. [Refer: Liabilities; Disposal groups classified as held for sale [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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