v3.25.4
Capital Stock (Summary of Stock Option Activity) (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Shares, Options outstanding at January 1 (in shares) | shares 10.8
Shares, Granted (in shares) | shares 1.0
Shares, Exercised (in shares) | shares (1.2)
Shares, Cancelled or forfeited (in shares) | shares (0.2)
Shares, Options outstanding at December 31 (in shares) | shares 10.4
Shares, Exercisable at December 31 (in shares) | shares 6.9
Shares, Options expected to vest (in shares) | shares 3.3
Weighted-Average Exercise Price  
Weighted average exercise price, Options outstanding at January 1 (in dollars per share) | $ / shares $ 214.87
Weighted average exercise price, Granted (in dollars per share) | $ / shares 392.36
Weighted average exercise price, Exercised (in dollars per share) | $ / shares 158.83
Weighted average exercise price, Cancelled or forfeited (in dollars per share) | $ / shares 313.05
Weighted average exercise price, Options outstanding at December 31 (in dollars per share) | $ / shares 234.56
Weighted average exercise price, Exercisable at December 31 (in dollars per share) | $ / shares 195.53
Weighted average exercise price, Options expected to vest (in dollars per share) | $ / shares $ 309.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted-average remaining contractual term, Options outstanding (in years) 5 years
Weighted-average remaining contractual term, Exercisable (in years) 3 years 8 months 12 days
Weighted-average remaining contractual term, Options expected to vest (in years) 7 years 6 months
Aggregate intrinsic value, Options outstanding | $ $ 1,246.1
Aggregate intrinsic value, Exercisable | $ 1,073.4
Aggregate intrinsic value, Options expected to vest | $ $ 166.7