XML 159 R139.htm IDEA: XBRL DOCUMENT v3.24.0.1
Shareholders' equity (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
May 22, 2023
shares
Aug. 04, 2022
shares
Jan. 17, 2022
shares
Aug. 04, 2021
shares
Dec. 31, 2023
SFr / shares
shares
Dec. 31, 2022
SFr / shares
shares
Dec. 31, 2021
shares
May 19, 2023
$ / shares
May 31, 2022
$ / shares
May 19, 2022
USD ($)
Jul. 19, 2021
USD ($)
May 31, 2021
$ / shares
Feb. 01, 2021
USD ($)
Nov. 19, 2020
USD ($)
Stockholders' Equity Note [Abstract]                            
Common Stock, Dividend Rate Approved | $ / shares               $ 0.86 $ 0.83     $ 0.80    
The number of votes associated with one Common Share         one                  
Annual dividend per share approved by shareholders | $ / shares               $ 3.44 $ 3.32     $ 3.20    
Authorized Share Capital [Line Items]                            
Common Shares, par value | SFr / shares         SFr 0.50 SFr 24.15                
Treasury Stock, Shares, Retired | shares 14,925,028 13,179,100 14,465,400 3,584,150 14,925,028 27,644,500 3,584,150              
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 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  
2022 Stock Repurchase Plan                            
Authorized Share Capital [Line Items]                            
Stock repurchase program authorized amount | $                   $ 2,500        
2021 Stock Repurchase Plan                            
Authorized Share Capital [Line Items]                            
Stock repurchase program authorized amount | $                     $ 5,000