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Derivatives and hedging activities - Credit protection sold/purchased (Details 4) - CHF (SFr)
SFr in Billions
 3 Months Ended 6 Months Ended
Dec. 31, 2019
Jun. 30, 2020
Credit protection sold/purchased    
Credit protection sold SFr (221.9) SFr (245.7)
Credit protection purchased 210.8 229.0
Net credit protection (sold)/purchased (11.1) (16.7)
Other protection purchased 88.7 80.4
Fair value of credit protection sold 3.1 (1.7)
Total return swaps    
Credit protection sold/purchased    
Credit protection sold (16.7) (15.8)
Maturity less than 1 year    
Credit protection sold/purchased    
Credit protection sold (61.1) (58.0)
Maturity between 1 to 5 years    
Credit protection sold/purchased    
Credit protection sold (140.4) (168.9)
Maturity greater than 5 years    
Credit protection sold/purchased    
Credit protection sold (20.4) (18.8)
Government debt securities    
Credit protection sold/purchased    
Credit protection sold (17.2) (14.5)
Credit protection purchased 15.4 13.3
Net credit protection (sold)/purchased (1.8) (1.2)
Other protection purchased 4.1 5.5
Fair value of credit protection sold 0.0 (0.1)
Non-sovereigns    
Credit protection sold/purchased    
Credit protection sold (204.7) (231.2)
Credit protection purchased 195.4 215.7
Net credit protection (sold)/purchased (9.3) (15.5)
Other protection purchased 84.6 74.9
Fair value of credit protection sold 3.1 (1.6)
Investment grade    
Credit protection sold/purchased    
Credit protection sold (162.1) (170.4)
Credit protection purchased 156.8 160.8
Net credit protection (sold)/purchased (5.3) (9.6)
Other protection purchased 55.5 51.6
Fair value of credit protection sold 1.2 (1.0)
Non-investment grade    
Credit protection sold/purchased    
Credit protection sold (59.8) (75.3)
Credit protection purchased 54.0 68.2
Net credit protection (sold)/purchased (5.8) (7.1)
Other protection purchased 33.2 28.8
Fair value of credit protection sold 1.9 (0.7)
Single-name instruments    
Credit protection sold/purchased    
Credit protection sold (84.7) (87.0)
Credit protection purchased 77.4 78.1
Net credit protection (sold)/purchased (7.3) (8.9)
Other protection purchased 27.6 28.3
Fair value of credit protection sold 1.4 (0.2)
Single-name instruments | Maturity less than 1 year    
Credit protection sold/purchased    
Credit protection sold (19.2) (18.7)
Single-name instruments | Maturity between 1 to 5 years    
Credit protection sold/purchased    
Credit protection sold (60.6) (63.2)
Single-name instruments | Maturity greater than 5 years    
Credit protection sold/purchased    
Credit protection sold (4.9) (5.1)
Single-name instruments | Government debt securities    
Credit protection sold/purchased    
Credit protection sold (17.2) (14.5)
Credit protection purchased 15.4 13.3
Net credit protection (sold)/purchased (1.8) (1.2)
Other protection purchased 4.1 5.5
Fair value of credit protection sold 0.0 (0.1)
Single-name instruments | Non-sovereigns    
Credit protection sold/purchased    
Credit protection sold (67.5) (72.5)
Credit protection purchased 62.0 64.8
Net credit protection (sold)/purchased (5.5) (7.7)
Other protection purchased 23.5 22.8
Fair value of credit protection sold 1.4 (0.1)
Single-name instruments | Investment grade    
Credit protection sold/purchased    
Credit protection sold (52.6) (56.0)
Credit protection purchased 47.9 49.6
Net credit protection (sold)/purchased (4.7) (6.4)
Other protection purchased 11.5 14.2
Fair value of credit protection sold 0.5 0.2
Single-name instruments | Non-investment grade    
Credit protection sold/purchased    
Credit protection sold (32.1) (31.0)
Credit protection purchased 29.5 28.5
Net credit protection (sold)/purchased (2.6) (2.5)
Other protection purchased 16.1 14.1
Fair value of credit protection sold 0.9 (0.4)
Multi-name instruments    
Credit protection sold/purchased    
Credit protection sold (137.2) (158.7)
Credit protection purchased 133.4 150.9
Net credit protection (sold)/purchased (3.8) (7.8)
Other protection purchased 61.1 52.1
Fair value of credit protection sold 1.7 (1.5)
Multi-name instruments | Maturity less than 1 year    
Credit protection sold/purchased    
Credit protection sold (41.9) (39.3)
Multi-name instruments | Maturity between 1 to 5 years    
Credit protection sold/purchased    
Credit protection sold (79.8) (105.7)
Multi-name instruments | Maturity greater than 5 years    
Credit protection sold/purchased    
Credit protection sold (15.5) (13.7)
Multi-name instruments | Non-sovereigns    
Credit protection sold/purchased    
Credit protection sold (137.2) (158.7)
Credit protection purchased 133.4 150.9
Net credit protection (sold)/purchased (3.8) (7.8)
Other protection purchased 61.1 52.1
Fair value of credit protection sold 1.7 (1.5)
Multi-name instruments | Investment grade    
Credit protection sold/purchased    
Credit protection sold (109.5) (114.4)
Credit protection purchased 108.9 111.2
Net credit protection (sold)/purchased (0.6) (3.2)
Other protection purchased 44.0 37.4
Fair value of credit protection sold 0.7 (1.2)
Multi-name instruments | Non-investment grade    
Credit protection sold/purchased    
Credit protection sold (27.7) (44.3)
Credit protection purchased 24.5 39.7
Net credit protection (sold)/purchased (3.2) (4.6)
Other protection purchased 17.1 14.7
Fair value of credit protection sold 1.0 (0.3)
Bank    
Credit protection sold/purchased    
Credit protection sold (221.9) (245.7)
Credit protection purchased 210.8 229.0
Net credit protection (sold)/purchased (11.1) (16.7)
Other protection purchased 88.7 80.4
Fair value of credit protection sold 3.1 (1.7)
Bank | Total return swaps    
Credit protection sold/purchased    
Credit protection sold (16.7) (15.8)
Bank | Maturity less than 1 year    
Credit protection sold/purchased    
Credit protection sold (61.1) (58.0)
Bank | Maturity between 1 to 5 years    
Credit protection sold/purchased    
Credit protection sold (140.4) (168.9)
Bank | Maturity greater than 5 years    
Credit protection sold/purchased    
Credit protection sold (20.4) (18.8)
Bank | Government debt securities    
Credit protection sold/purchased    
Credit protection sold (17.2) (14.5)
Credit protection purchased 15.4 13.3
Net credit protection (sold)/purchased (1.8) (1.2)
Other protection purchased 4.1 5.5
Fair value of credit protection sold 0.0 (0.1)
Bank | Non-sovereigns    
Credit protection sold/purchased    
Credit protection sold (204.7) (231.2)
Credit protection purchased 195.4 215.7
Net credit protection (sold)/purchased (9.3) (15.5)
Other protection purchased 84.6 74.9
Fair value of credit protection sold 3.1 (1.6)
Bank | Investment grade    
Credit protection sold/purchased    
Credit protection sold (162.1) (170.4)
Credit protection purchased 156.8 160.8
Net credit protection (sold)/purchased (5.3) (9.6)
Other protection purchased 55.5 51.6
Fair value of credit protection sold 1.2 (1.0)
Bank | Non-investment grade    
Credit protection sold/purchased    
Credit protection sold (59.8) (75.3)
Credit protection purchased 54.0 68.2
Net credit protection (sold)/purchased (5.8) (7.1)
Other protection purchased 33.2 28.8
Fair value of credit protection sold 1.9 (0.7)
Bank | Single-name instruments    
Credit protection sold/purchased    
Credit protection sold (84.7) (87.0)
Credit protection purchased 77.4 78.1
Net credit protection (sold)/purchased (7.3) (8.9)
Other protection purchased 27.6 28.3
Fair value of credit protection sold 1.4 (0.2)
Bank | Single-name instruments | Maturity less than 1 year    
Credit protection sold/purchased    
Credit protection sold (19.2) (18.7)
Bank | Single-name instruments | Maturity between 1 to 5 years    
Credit protection sold/purchased    
Credit protection sold (60.6) (63.2)
Bank | Single-name instruments | Maturity greater than 5 years    
Credit protection sold/purchased    
Credit protection sold (4.9) (5.1)
Bank | Single-name instruments | Government debt securities    
Credit protection sold/purchased    
Credit protection sold (17.2) (14.5)
Credit protection purchased 15.4 13.3
Net credit protection (sold)/purchased (1.8) (1.2)
Other protection purchased 4.1 5.5
Fair value of credit protection sold 0.0 (0.1)
Bank | Single-name instruments | Non-sovereigns    
Credit protection sold/purchased    
Credit protection sold (67.5) (72.5)
Credit protection purchased 62.0 64.8
Net credit protection (sold)/purchased (5.5) (7.7)
Other protection purchased 23.5 22.8
Fair value of credit protection sold 1.4 (0.1)
Bank | Single-name instruments | Investment grade    
Credit protection sold/purchased    
Credit protection sold (52.6) (56.0)
Credit protection purchased 47.9 49.6
Net credit protection (sold)/purchased (4.7) (6.4)
Other protection purchased 11.5 14.2
Fair value of credit protection sold 0.5 0.2
Bank | Single-name instruments | Non-investment grade    
Credit protection sold/purchased    
Credit protection sold (32.1) (31.0)
Credit protection purchased 29.5 28.5
Net credit protection (sold)/purchased (2.6) (2.5)
Other protection purchased 16.1 14.1
Fair value of credit protection sold 0.9 (0.4)
Bank | Multi-name instruments    
Credit protection sold/purchased    
Credit protection sold (137.2) (158.7)
Credit protection purchased 133.4 150.9
Net credit protection (sold)/purchased (3.8) (7.8)
Other protection purchased 61.1 52.1
Fair value of credit protection sold 1.7 (1.5)
Bank | Multi-name instruments | Maturity less than 1 year    
Credit protection sold/purchased    
Credit protection sold (41.9) (39.3)
Bank | Multi-name instruments | Maturity between 1 to 5 years    
Credit protection sold/purchased    
Credit protection sold (79.8) (105.7)
Bank | Multi-name instruments | Maturity greater than 5 years    
Credit protection sold/purchased    
Credit protection sold (15.5) (13.7)
Bank | Multi-name instruments | Non-sovereigns    
Credit protection sold/purchased    
Credit protection sold (137.2) (158.7)
Credit protection purchased 133.4 150.9
Net credit protection (sold)/purchased (3.8) (7.8)
Other protection purchased 61.1 52.1
Fair value of credit protection sold 1.7 (1.5)
Bank | Multi-name instruments | Investment grade    
Credit protection sold/purchased    
Credit protection sold (109.5) (114.4)
Credit protection purchased 108.9 111.2
Net credit protection (sold)/purchased (0.6) (3.2)
Other protection purchased 44.0 37.4
Fair value of credit protection sold 0.7 (1.2)
Bank | Multi-name instruments | Non-investment grade    
Credit protection sold/purchased    
Credit protection sold (27.7) (44.3)
Credit protection purchased 24.5 39.7
Net credit protection (sold)/purchased (3.2) (4.6)
Other protection purchased 17.1 14.7
Fair value of credit protection sold SFr 1.0 SFr (0.3)