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Reclassification and remeasurement of carrying amounts and recognition of ECL upon adoption of IFRS 9 (Detail) - CHF (SFr)
SFr in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
[1]
Jun. 30, 2017
[1]
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Recognition of ECL (IFRS 9)   SFr (28) SFr (25) SFr (46) SFr (53) SFr (46)
Total assets            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Assets SFr (245)          
Recognition of ECL (IFRS 9) (211)          
Total financial assets measured at amortized cost            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets (31,321)          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Assets 0          
Recognition of ECL (IFRS 9) (275)          
Cash and balances at central banks            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Recognition of ECL (IFRS 9) 0          
Loans and advances to banks            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets (17)          
Recognition of ECL (IFRS 9) (3)          
Receivables from securities financing transactions            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets (4,957)          
Recognition of ECL (IFRS 9) (2)          
Cash collateral receivables on derivative instruments            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Recognition of ECL (IFRS 9) 0          
Loans and advances to customers            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets (7,822)          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Assets 0          
Recognition of ECL (IFRS 9) (235)          
Other financial assets measured at amortized cost            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets (18,525)          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Assets 0          
Recognition of ECL (IFRS 9) (35)          
Financial Assets At Fair Value Through Profit Or Loss Category [Member]            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets 33,231          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Assets (303)          
Financial assets at fair value held for trading            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets (10,854)          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Assets (15)          
Brokerage receivables mandatorily measured at fair value            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets 23,787          
Financial assets at fair value not held for trading            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets 20,297          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Assets (287)          
Financial assets measured at fair value through other comprehensive income            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Assets (1,911)          
Deferred tax assets            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Assets 58          
Recognition of ECL (IFRS 9) 64          
Liabilities            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Recognition of ECL (IFRS 9) 74          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Liabilities 49          
Total financial liabilities measured at amortized cost            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Liabilities (39,996)          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Liabilities (4)          
Payables from securities financing transactions            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Liabilities (5,081)          
Customer deposits            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Liabilities (5,268)          
Other financial liabilities measured at amortized cost            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Liabilities (29,646)          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Liabilities (4)          
Total financial liabilities measured at fair value through profit or loss            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Liabilities 39,996          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Liabilities 53          
Derivative financial liabilities            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Liabilities 57          
Brokerage payable designated at fair value            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Liabilities 34,915          
Other financial liabilities designated at fair value            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Liabilities 5,081          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Liabilities (5)          
Provisions            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Recognition of ECL (IFRS 9) 74          
Total equity            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Recognition of ECL (IFRS 9) (284)          
Reclassification (of IAS 39 carrying amounts), Equity 0          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Equity (293)          
Total equity attributable to shareholders            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Recognition of ECL (IFRS 9) (284)          
Reclassification (of IAS 39 carrying amounts), Equity 0          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Equity (293)          
Retained earnings            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Recognition of ECL (IFRS 9) (284)          
Reclassification (of IAS 39 carrying amounts), Equity 72          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Equity (293)          
Other comprehensive income recognized directly in equity, net of tax            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Reclassification (of IAS 39 carrying amounts), Equity (72)          
Total liabilities and equity            
Disclosure Of Reclassifications Or Changes In Presentation [Line Items]            
Recognition of ECL (IFRS 9) (211)          
Reclassification (of IAS 39 carrying amounts), Equity 0          
Remeasurement due to reclassification incl. reversal of IAS 39/ IAS 37 allowances/provisions, Equity SFr (245)          
[1]
Prior period information may not be comparable as a result of the adoption of IFRS 9, Financial Instruments and IFRS 15, Revenue from Contracts with Customers, both effective 1 January 2018. Refer to Note 1 for more information on these changes.