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Accumulated other comprehensive income (Details) - CHF (SFr) SFr in Millions | 6 Months Ended
--- | ---
Jun. 30, 2023 | Jun. 30, 2022
Increase (Decrease) in Accumulated other Comprehensive Income |  |
Balance at beginning of period | SFr (15,067) |
Balance at end of period | (19,900) |
Gains/(losses) on cash flow hedges |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |
Balance at beginning of period | (1,317) | SFr (95)
Increase/(decrease) | 289 | (727)
Reclassification adjustments, included in net income | (82) | (121)
Total increase/(decrease) | 207 | (848)
Balance at end of period | (1,110) | (943)
Cumulative translation adjustments |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |
Balance at beginning of period | (17,020) | (16,760)
Increase/(decrease) | (1,072) | 934
Reclassification adjustments, included in net income | 59 | 0
Total increase/(decrease) | (1,013) | 934
Balance at end of period | (18,033) | (15,826)
Unrealized gains/(losses) on securities |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |
Balance at beginning of period | (13) | 13
Increase/(decrease) | 1 | (6)
Reclassification adjustments, included in net income | 0 | 0
Total increase/(decrease) | 1 | (6)
Balance at end of period | (12) | 7
Actuarial gains/(losses) |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |
Balance at beginning of period | (582) | (429)
Increase/(decrease) | (47) | 0
Reclassification adjustments, included in net income | 3 | 4
Total increase/(decrease) | (44) | 4
Balance at end of period | (626) | (425)
Net prior service credit/ (cost) |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |
Balance at beginning of period | (9) | (6)
Increase/(decrease) | 0 | (1)
Reclassification adjustments, included in net income | 1 | 1
Total increase/(decrease) | 1 | 0
Balance at end of period | (8) | (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)
Increase/(decrease) | 3,746 | 3,516
Reclassification adjustments, included in net income | (7,731) | 17
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) | (3,985) | 3,533
Balance at end of period | (111) | 1,451
Accumulated other comprehensive income |  |
Increase (Decrease) in Accumulated other Comprehensive Income |  |
Balance at beginning of period | (15,067) | (19,359)
Increase/(decrease) | 2,917 | 3,716
Reclassification adjustments, included in net income | (7,750) | (99)
Total increase/(decrease) | (4,833) | 3,617
Balance at end of period | SFr (19,900) | SFr (15,742)

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e681-108580 + Details
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