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FI - Roll-forward of net assets measured at fair value on recurring basis (Details 7) - Recurring basis - CHF (SFr) SFr in Millions | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Balance at beginning of period, net assets/liabilities | SFr (3,865) | SFr 2,329
Transfers in, net assets/liabilities | (717) | (2,678)
Transfers out, net assets/liabilities | 4,664 | 1,394
Purchases, net assets/liabilities | 4,074 | 5,267
Sales, net assets/liabilities | (3,871) | (5,628)
Issuances, net assets/liabilities | (5,030) | (5,353)
Settlements, net assets/liabilities | 3,056 | 2,651
Gain (loss) on transfers in/out included in trading revenues, net assets/liabilities | 570 | (161)
Gain (loss) on all other activity included in trading revenues, net assets/liabilities | 560 | (78)
Gain (loss) on transfers in/out included in other revenues, net assets/liabilities | (1) | (107)
Gain (loss) on all other activity included in other revenues, net assets/liabilities | (21) | 255
Gain (loss) on transfers in/out included in accumulated other comprehensive income, net assets/liabilities | 35 | 3
Gain (loss) on all other activity included in accumulated other comprehensive income, net assets/liabilities | 243 | 43
Foreign currency translation impact, net assets/liabilities | (178) | 4
Balance at beginning of period, net assets/liabilities | (481) | (2,059)
Other Comprehensive Income (Loss) [Member] |  |
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Changes in unrealized gains/losses | 273 | 16
Trading Revenue [Member] |  |
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Changes in unrealized gains/losses | 1,044 | (1,011)
Other Revenue [Member] |  |
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Changes in unrealized gains/losses | (77) | 25
Net Revenue [Member] |  |
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Changes in unrealized gains/losses | 1,240 | (970)
Bank |  |
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Balance at beginning of period, net assets/liabilities | (3,864) | 2,332
Transfers in, net assets/liabilities | (717) | (2,660)
Transfers out, net assets/liabilities | 4,664 | 1,375
Purchases, net assets/liabilities | 4,074 | 5,267
Sales, net assets/liabilities | (3,870) | (5,628)
Issuances, net assets/liabilities | (5,030) | (5,353)
Settlements, net assets/liabilities | 3,056 | 2,643
Gain (loss) on transfers in/out included in trading revenues, net assets/liabilities | 570 | (161)
Gain (loss) on all other activity included in trading revenues, net assets/liabilities | 560 | (74)
Gain (loss) on transfers in/out included in other revenues, net assets/liabilities | (1) | (102)
Gain (loss) on all other activity included in other revenues, net assets/liabilities | (21) | 259
Gain (loss) on transfers in/out included in accumulated other comprehensive income, net assets/liabilities | 35 | 3
Gain (loss) on all other activity included in accumulated other comprehensive income, net assets/liabilities | 243 | 43
Foreign currency translation impact, net assets/liabilities | (181) | (3)
Balance at beginning of period, net assets/liabilities | (482) | (2,059)
Bank | Other Comprehensive Income (Loss) [Member] |  |
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Changes in unrealized gains/losses | 273 | 15
Bank | Trading Revenue [Member] |  |
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Changes in unrealized gains/losses | 1,044 | (1,003)
Bank | Other Revenue [Member] |  |
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Changes in unrealized gains/losses | (77) | 28
Bank | Net Revenue [Member] |  |
Net assets/liabilities measured at fair value on a recurring basis for level 3 |  |
Changes in unrealized gains/losses | SFr 1,240 | SFr (960)

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- Definition This element represents the impact of foreign currency translation on the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3). + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition This element represents the amount of the total gains or losses for the period which are included in the statement of income other revenues, related to all other activity other than transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3). + References No definition available. + Details
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- Definition This element represents the amount of the total gains or losses for the period which are included in the statement of income included in trading revenues, related to all other activity other than transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3). + References No definition available. + Details
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- References No definition available. + Details
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- Definition This element represents the amount of the total gains or losses for the period which are included in the statement of income in other revenues, related to transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3). + References No definition available. + Details
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- Definition This element represents the amount of the total gains or losses for the period which are included in the statement of income in trading revenues, related to transfers in or out of the fair value of net assets/liabilities measured on a recurring basis using significant unobservable inputs reconciliation (Level 3). + References No definition available. + Details
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- Definition Issues that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Purchases that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Sales that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | cs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisNetAssetsLiabilitiesSales
Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Settlements that have taken place during the period in relation to net assets/liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents transfers in to net assets/liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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Period Type: | duration

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- Definition This element represents transfers out of net assets/liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents the net assets/liabilities measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References No definition available. + Details
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Namespace Prefix: | cs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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