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Accumulated other comprehensive income (Details) - CHF (SFr) SFr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
Balance at beginning of period | SFr (15,067) |  |
Balance at end of period | (20,039) | SFr (15,067) |
Gains/(losses) on cash flow hedges |  |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
Balance at beginning of period | (1,317) | (95) | SFr 205
Increase/(decrease) | 413 | (454) | (259)
Reclassification adjustments, included in net income | 238 | (768) | (41)
Reclassification from accumulated other comprehensive income retained earnings current period net of tax | 0 |  |
Total increase/(decrease) | 651 | (1,222) | (300)
Balance at end of period | (666) | (1,317) | (95)
Cumulative translation adjustments |  |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
Balance at beginning of period | (17,020) | (16,760) | (17,517)
Increase/(decrease) | (2,421) | (260) | 751
Reclassification adjustments, included in net income | 58 | 0 | 6
Reclassification from accumulated other comprehensive income retained earnings current period net of tax | 1,530 | 0 | 0
Total increase/(decrease) | (833) | (260) | 757
Balance at end of period | (17,853) | (17,020) | (16,760)
Unrealized gains/(losses) on securities |  |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
Balance at beginning of period | (13) | 13 | 13
Increase/(decrease) | (1) | (21) | 0
Reclassification adjustments, included in net income | 0 | (5) | 0
Reclassification from accumulated other comprehensive income retained earnings current period net of tax | 19 |  |
Total increase/(decrease) | 18 | (26) | 0
Balance at end of period | 5 | (13) | 13
Actuarial gains/(losses) |  |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
Balance at beginning of period | (582) | (429) | (460)
Increase/(decrease) | (37) | (170) | 12
Reclassification adjustments, included in net income | 12 | 17 | 19
Reclassification from accumulated other comprehensive income retained earnings current period net of tax | 0 |  |
Total increase/(decrease) | (25) | (153) | 31
Balance at end of period | (607) | (582) | (429)
Net prior service credit/ (cost) |  |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
Balance at beginning of period | (9) | (6) | (11)
Increase/(decrease) | 0 | (4) | 4
Reclassification adjustments, included in net income | 1 | 1 | 1
Reclassification from accumulated other comprehensive income retained earnings current period net of tax | 0 |  |
Total increase/(decrease) | 1 | (3) | 5
Balance at end of period | (8) | (9) | (6)
Accumulated Gains (Losses) On Liabilities Related To Credit Risk |  |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
Balance at beginning of period | 3,874 | (2,082) | (2,469)
Increase/(decrease) | 2,937 | 5,987 | 284
Reclassification adjustments, included in net income | (7,721) | (31) | 103
Reclassification from accumulated other comprehensive income retained earnings current period net of tax | 0 |  |
Reclassification from accumulated other comprehensive income current period impact write down additional tier 1 capital income tax expense benefit | 1,440 |  |
Reclassification from accumulated other comprehensive income, current period, write down additional tier 1 capital gross of tax | (9,048) |  |
Total increase/(decrease) | (4,784) | 5,956 | 387
Balance at end of period | (910) | 3,874 | (2,082)
Accumulated other comprehensive income |  |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |  |
Balance at beginning of period | (15,067) | (19,359) | (20,239)
Increase/(decrease) | 891 | 5,078 | 792
Reclassification adjustments, included in net income | (7,412) | (786) | 88
Reclassification from accumulated other comprehensive income retained earnings current period net of tax | 1,549 |  |
Total increase/(decrease) | (4,972) | 4,292 | 880
Balance at end of period | SFr (20,039) | SFr (15,067) | SFr (19,359)

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