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Loans, allowance for loan losses and credit quality - Restructured loans (Details 8)
SFr in Millions
12 Months Ended
Dec. 31, 2018
CHF (SFr)
contract
Dec. 31, 2017
CHF (SFr)
contract
Dec. 31, 2016
CHF (SFr)
contract
Restructured loans      
Restructured loans, Modifications, Number of contracts | contract 18 15 16
Restructured loans, Modifications, Pre-Modification Recorded Investment SFr 211 SFr 123 SFr 201
Restructured loans, Modifications, Post-Modification Recorded Investment SFr 189 SFr 119 SFr 201
Restructured loans, subsequently defaulted, Number of contracts | contract 9 1 0
Restructured loans, subsequently defaulted, Recorded Investment SFr 84 SFr 48 SFr 0
Consumer | Mortgages      
Restructured loans      
Restructured loans, Modifications, Number of contracts | contract 5 0 0
Restructured loans, Modifications, Pre-Modification Recorded Investment SFr 29 SFr 0 SFr 0
Restructured loans, Modifications, Post-Modification Recorded Investment SFr 29 SFr 0 SFr 0
Restructured loans, subsequently defaulted, Number of contracts | contract 1 0 0
Restructured loans, subsequently defaulted, Recorded Investment SFr 8 SFr 0 SFr 0
Corporate and institutional | Commercial and industrial loans      
Restructured loans      
Restructured loans, Modifications, Number of contracts | contract 13 15 16
Restructured loans, Modifications, Pre-Modification Recorded Investment SFr 182 SFr 123 SFr 201
Restructured loans, Modifications, Post-Modification Recorded Investment SFr 160 SFr 119 SFr 201
Restructured loans, subsequently defaulted, Number of contracts | contract 8 1 0
Restructured loans, subsequently defaulted, Recorded Investment SFr 76 SFr 48 SFr 0
Bank      
Restructured loans      
Restructured loans, Modifications, Number of contracts | contract 18 15 16
Restructured loans, Modifications, Pre-Modification Recorded Investment SFr 211 SFr 123 SFr 201
Restructured loans, Modifications, Post-Modification Recorded Investment SFr 189 SFr 119 SFr 201
Restructured loans, subsequently defaulted, Number of contracts | contract 9 1 0
Restructured loans, subsequently defaulted, Recorded Investment SFr 84 SFr 48 SFr 0
Bank | Consumer | Mortgages      
Restructured loans      
Restructured loans, Modifications, Number of contracts | contract 5 0 0
Restructured loans, Modifications, Pre-Modification Recorded Investment SFr 29 SFr 0 SFr 0
Restructured loans, Modifications, Post-Modification Recorded Investment SFr 29 SFr 0 SFr 0
Restructured loans, subsequently defaulted, Number of contracts | contract 1 0 0
Restructured loans, subsequently defaulted, Recorded Investment SFr 8 SFr 0 SFr 0
Bank | Corporate and institutional | Commercial and industrial loans      
Restructured loans      
Restructured loans, Modifications, Number of contracts | contract 13 15 16
Restructured loans, Modifications, Pre-Modification Recorded Investment SFr 182 SFr 123 SFr 201
Restructured loans, Modifications, Post-Modification Recorded Investment SFr 160 SFr 119 SFr 201
Restructured loans, subsequently defaulted, Number of contracts | contract 8 1 0
Restructured loans, subsequently defaulted, Recorded Investment SFr 76 SFr 48 SFr 0