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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, 2023
USD ($)
$ / shares
shares
Number of options outstanding at January 1, 2021 | shares 2,008
Options granted | shares 250
Options forfeited or expired | shares (27)
Options exercised | shares (148)
Number of options outstanding at December 31, 2021 | shares 2,083
Number of options exercisable at December 31, 2021 | shares 1,489
Options outstanding at January 1, 2021 (Weighted-average exercise price) | $ / shares $ 61.71
Options granted (Weighted-average exercise price) | $ / shares 71.16
Options forfeited or expired (Weighted-average exercise price) | $ / shares 71.37
Options exercised (Weighted-average exercise price) | $ / shares 43.32
Options outstanding at December 31, 2021 Weighted-average exercise price) | $ / shares 64.03
Options exercisable at December 31, 2021 (Weighted-average exercise price) | $ / shares $ 60.86
Weighted-average remaining contractual term in years at December 31, 2021 5 years
Weighted-average remaining contractual term in years exercisable at December 31, 2021 3 years 9 months 18 days
Aggregate intrinsic value outstanding at December 31, 2021 | $ $ 10
Aggregate intrinsic value exercisable at December 31, 2021 | $ $ 10