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Shareholders' equity (Detail) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2022 shares | Jan. 17, 2022 shares | Dec. 31, 2022 SFr / shares shares | Dec. 31, 2021 SFr / shares shares | Dec. 31, 2020 shares | May 31, 2022 $ / shares | May 19, 2022 USD ($) | Jul. 19, 2021 USD ($) | May 31, 2021 $ / shares | Feb. 01, 2021 USD ($) | Nov. 19, 2020 USD ($) | May 31, 2020 $ / shares | Nov. 21, 2019 USD ($)
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividend Rate Approved | $ / shares |  |  |  |  |  | $ 0.83 |  |  | $ 0.80 |  |  | $ 0.78 |
The number of votes associated with one Common Share |  |  | one |  |  |  |  |  |  |  |  |  |
Annual dividend per share approved by shareholders | $ / shares |  |  |  |  |  | $ 3.32 |  |  | $ 3.20 |  |  | $ 3.12 |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Shares, par value | SFr / shares |  |  | SFr 24.15 | SFr 24.15 |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Retired | shares | 13,179,100 | 14,465,400 | 27,644,500 | 3,584,150 | 2,178,600 |  |  |  |  |  |  |  |
The maximum ownership percentage for voting allowed for any one shareholder |  |  | 10.00% |  |  |  |  |  |  |  |  |  |
General Purpose |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized share capital for future issuance | shares |  |  | 200,000,000 |  |  |  |  |  |  |  |  |  |
Issuance of Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized share capital for future issuance | shares |  |  | 33,000,000 |  |  |  |  |  |  |  |  |  |
Employee Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized share capital for future issuance | shares |  |  | 25,410,929 |  |  |  |  |  |  |  |  |  |
Nov 2019 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500
Nov 2020 Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  |  |  |  |  | $ 2,500 | $ 1,500 |  |
CB_Increase(Decrease)StockRepurchaseProgramAuthorizedAmount |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |
July 2021 Stock Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |
2022 Stock Repurchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized Share Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  |  | $ 2,500 |  |  |  |  |  |

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