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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Schedule Of Earnings Per Share, Basic And Diluted
Three Months EndedNine Months Ended
September 30September 30
(in millions of U.S. dollars, except share and per share data)2025202420252024
Numerator:
Net income$3,107 $2,490 $7,449 $7,000 
Net income (loss) attributable to noncontrolling interests306 166 349 303 
Net income attributable to Chubb$2,801 $2,324 $7,100 $6,697 
Denominator:
Denominator for basic earnings per share attributable to Chubb:
Weighted-average shares outstanding397,336,568 403,831,412 399,289,363 404,700,118 
Denominator for diluted earnings per share attributable to Chubb:
Share-based compensation plans3,532,323 4,047,315 3,902,807 4,191,655 
Weighted-average shares outstanding and assumed conversions
400,868,891 407,878,727 403,192,170 408,891,773 
Basic earnings per share attributable to Chubb$7.05 $5.75 $17.78 $16.55 
Diluted earnings per share attributable to Chubb$6.99 $5.70 $17.61 $16.38 
Potential anti-dilutive share conversions1,631,069 1,330,590 1,819,681 1,080,371