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Stock-Based Compensation - Summary of Non-Qualified and Incentive Stock Option Right Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Optioned Shares      
Outstanding beginning of year (in shares) 10,503,378 12,119,187 13,455,747
Granted (in shares) 972,575 1,373,793 1,496,658
Exercised (in shares) (2,362,173) (2,872,836) (2,706,498)
Forfeited (in shares) (124,967) (113,715) (120,936)
Expired (in shares) (5,878) (3,051) (5,784)
Outstanding end of year (in shares) 8,982,935 10,503,378 12,119,187
Exercisable at end of year (in shares) 6,713,727 7,681,440 8,920,968
Weighted- Average Exercise Price Per Share      
Outstanding beginning of year (in dollars per share) $ 120.34 $ 96.82 $ 79.51
Granted (in dollars per share) 292.15 213.39 183.11
Exercised (in dollars per share) 82.50 63.63 57.12
Forfeited (in dollars per share) 195.90 170.80 126.71
Expired (in dollars per share) 141.27 139.55 115.23
Outstanding end of year (in dollars per share) 147.83 120.34 96.82
Exercisable at end of year (in dollars per share) $ 116.32 $ 95.07 $ 75.50
Aggregate Intrinsic Value      
Outstanding end of year $ 1,835.5 $ 1,309.1 $ 1,184.0
Exercisable at end of year $ 1,583.4 $ 1,151.5 $ 1,061.7