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Share-Based Compensation Plans (Company's Non-Vested Performance Share Unit Awards) (Details) - Performance Shares [Member] - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding at January 1, Shares 38,891 34,850 32,382
Granted, Shares 22,205 16,120 16,855
Increase/(Decrease) on vesting units due to performance, Shares (800) (2,227) (3,455)
Vested, Shares 9,801 6,157 10,922
Forfeited, Shares 3,695
Outstanding at December 31, Shares 50,495 38,891 34,850
Outstanding at January 1, Weighted Average Grant Date Fair Value
Granted, Weighted Average Grant Date Fair Value 242.24 277.15 223.45
Vested, Weighted Average Grant Date Fair Value 242.24 277.15 223.45
Forfeited, Weighted Average Grant Date Fair Value
Outstanding at December 31, Weighted Average Grant Date Fair Value