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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, 2021
USD ($)
$ / shares
shares
Number of options outstanding at January 1, 2021 | shares 2,879
Options granted | shares 233
Options forfeited or expired | shares (33)
Options exercised | shares (835)
Number of options outstanding at December 31, 2021 | shares 2,244
Number of options exercisable at December 31, 2021 | shares 1,487
Options outstanding at January 1, 2021 (Weighted-average exercise price) | $ / shares $ 52.81
Options granted (Weighted-average exercise price) | $ / shares 60.20
Options forfeited or expired (Weighted-average exercise price) | $ / shares 69.42
Options exercised (Weighted-average exercise price) | $ / shares 41.60
Options outstanding at December 31, 2021 Weighted-average exercise price) | $ / shares 57.50
Options exercisable at December 31, 2021 (Weighted-average exercise price) | $ / shares $ 53.02
Weighted-average remaining contractual term in years at December 31, 2021 5 years 6 months
Weighted-average remaining contractual term in years exercisable at December 31, 2021 4 years 2 months 12 days
Aggregate intrinsic value outstanding at December 31, 2021 | $ $ 68
Aggregate intrinsic value exercisable at December 31, 2021 | $ $ 52