Business developments - Share transactions (Details 2) - CHF (SFr) SFr in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Jun. 30, 2020 |
Dec. 31, 2018 |
|
| Additional share information | |||||
| Issuance of common shares | 203,000,000 | 0 | 0 | ||
| Issued shares (in shares) | 2,650,747,720 | 2,447,747,720 | 2,556,011,720 | 2,556,011,720 | |
| Series A MCNs [Member] | |||||
| Additional share information | |||||
| Issuance of common shares | 100,000,000 | ||||
| MCNs principal amount | SFr 865 | ||||
| Series B MCNs [Member] | |||||
| Additional share information | |||||
| Issuance of common shares | 103,000,000 | ||||
| MCNs principal amount | SFr 891 | ||||