AOCI - Significant reclassification adjustments (Details 3) - CHF (SFr)
SFr in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification adjustments, included in net income      
Income tax expense/(benefit) SFr 1,026 SFr 801 SFr 1,295
Gains/(losses) on cash flow hedges      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income (41) 87 25
Cumulative translation adjustments      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income 6 17 6
Unrealized gains/(losses) on securities      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income 0 32 0
Accumulated other comprehensive income      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income 288 440 385
Net prior service credit/ (cost)      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income (95) (143) (121)
Net prior service credit/ (cost) | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income, before tax (118) (176) (153)
Income tax expense/(benefit) 23 33 32
Actuarial gains/(losses)      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income 315 290 282
Actuarial gains/(losses) | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income, before tax 388 355 355
Income tax expense/(benefit) (73) (65) (73)
Bank      
Reclassification adjustments, included in net income      
Income tax expense/(benefit) 938 697 1,298
Bank | Gains/(losses) on cash flow hedges      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income (41) 87 21
Bank | Cumulative translation adjustments      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income 6 17 3
Bank | Unrealized gains/(losses) on securities      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income 0 32 0
Bank | Accumulated other comprehensive income      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income 88 305 235
Bank | Net prior service credit/ (cost)      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income 1 0 1
Bank | Actuarial gains/(losses)      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income 19 12 17
Bank | Actuarial gains/(losses) | Reclassification out of Accumulated Other Comprehensive Income [Member]      
Reclassification adjustments, included in net income      
Reclassification adjustments, included in net income, before tax 23 13 22
Income tax expense/(benefit) SFr (4) SFr (1) SFr (5)