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FVM - Level 3 instruments: Sensitivity to changes in unobservable input assumptions (Detail) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	$ 2,308	$ 791	$ 738
Unfavorable changes	(1,978)	(744)	(696)
Credit Suisse
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	1,578
Unfavorable changes	(1,312)
Traded loans, loans measured at fair value, loan commitments and guarantees
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	325	12	19
Unfavorable changes	(234)	(13)	(12)
Securities financing transactions
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	37	27	33
Unfavorable changes	(37)	(29)	(37)
Auction rate securities
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	44	45	46
Unfavorable changes	(44)	(45)	(46)
Asset-backed securities
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	48	29	27
Unfavorable changes	(47)	(27)	(27)
Equity instruments
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	483	188	183
Unfavorable changes	(397)	(164)	(161)
Investment fund units
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	127	29	19
Unfavorable changes	(129)	(30)	(21)
Interest rate derivative contracts, net
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	221	20	18
Unfavorable changes	(111)	(13)	(12)
Credit derivative contracts, net
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	75	3	3
Unfavorable changes	(67)	(5)	(4)
Foreign exchange derivative contracts, net
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	6	4	10
Unfavorable changes	(6)	(5)	(5)
Equity / index derivative contracts, net
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	646	371	361
Unfavorable changes	(614)	(338)	(330)
Other
Disclosure Of Sensitivity Analysis Of Fair Value Measurement To Changes In Unobservable Inputs Assets And Liabilities [Line Items]
Favorable changes	296	63	20
Unfavorable changes	$ (292)	$ (74)	$ (41)

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- Definition

The amount of decrease in the fair value measurement of assets due to a change in multiple unobservable inputs to reflect reasonably possible alternative assumptions.

+ References

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+ Details

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- Definition

The amount of increase in the fair value measurement of assets due to a change in multiple unobservable inputs to reflect reasonably possible alternative assumptions.

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+ Details

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