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Share-Based Compensation (Summary of the Corporation's Stock Option Activity and Related Information) (Details) - Stock Options
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
$ / shares
shares
Options granted | shares 322
Options forfeited or expired | shares (60)
Options exercised | shares (279)
Number of options outstanding at December 31, 2021 | shares 2,066
Number of options exercisable at December 31, 2021 | shares 1,456
Options granted (Weighted-average exercise price) | $ / shares $ 53.96
Options forfeited or expired (Weighted-average exercise price) | $ / shares 67.87
Options exercised (Weighted-average exercise price) | $ / shares 46.19
Options outstanding at December 31, 2021 Weighted-average exercise price) | $ / shares 64.76
Options exercisable at December 31, 2021 (Weighted-average exercise price) | $ / shares $ 64.87
Weighted-average remaining contractual term in years at December 31, 2021 5 years 3 months 18 days
Weighted-average remaining contractual term in years exercisable at December 31, 2021 4 years
Aggregate intrinsic value outstanding at December 31, 2021 | $ $ 12
Aggregate intrinsic value exercisable at December 31, 2021 | $ $ 9