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Capital Stock (Summary of Stock Option Activity) (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
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 11.5
Shares, Granted (in shares) | shares 1.3
Shares, Exercised (in shares) | shares (1.7)
Shares, Cancelled or forfeited (in shares) | shares (0.3)
Shares, Options outstanding at December 31 (in shares) | shares 10.8
Shares, Exercisable at December 31 (in shares) | shares 6.6
Shares, Options expected to vest (in shares) | shares 3.9
Weighted-Average Exercise Price  
Weighted average exercise price, Options outstanding at January 1 (in dollars per share) | $ / shares $ 189.70
Weighted average exercise price, Granted (in dollars per share) | $ / shares 339.72
Weighted average exercise price, Exercised (in dollars per share) | $ / shares 134.86
Weighted average exercise price, Cancelled or forfeited (in dollars per share) | $ / shares 274.74
Weighted average exercise price, Options outstanding at December 31 (in dollars per share) | $ / shares 214.87
Weighted average exercise price, Exercisable at December 31 (in dollars per share) | $ / shares 175.39
Weighted average exercise price, Options expected to vest (in dollars per share) | $ / shares $ 275.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted-average remaining contractual term, Options outstanding (in years) 5 years 3 months 18 days
Weighted-average remaining contractual term, Exercisable (in years) 3 years 1 month 6 days
Weighted-average remaining contractual term, Options expected to vest (in years) 7 years 8 months 12 days
Aggregate intrinsic value, Options outstanding | $ $ 1,572.6
Aggregate intrinsic value, Exercisable | $ 1,223.3
Aggregate intrinsic value, Options expected to vest | $ $ 331.8