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Provision for credit losses (Tables)
12 Months Ended
Dec. 31, 2017
Provision for credit losses
in 2017 2016 2015
Provision for credit losses (CHF million)    
Provision for loan losses 190 249 295
Provision for lending-related and other exposures 20 3 29
Provision for credit losses   210 252 324
Bank  
Provision for credit losses
in 2017 2016 2015
Provision for credit losses (CHF million)    
Provision for loan losses 190 249 295
Provision for lending-related and other exposures 20 3 29
Provision for credit losses   210 252 324