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Employee Incentive Plans - Status of and Changes in Restricted Stock Awards and SPSs (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Grants and Units      
Grants/Units      
Outstanding - January 1 (in shares) 1,945 2,138 1,295
Awarded (in shares) 791 870 1,451
Vested (in shares) (1,026) (964) (560)
Forfeited (in shares) (110) (99) (48)
Outstanding - December 31 (in shares) 1,600 1,945 2,138
Weighted Average Fair Value at Award Date      
Outstanding - January 1 (in dollars per share) $ 178.78 $ 168.12 $ 126.44
Awarded (in dollars per share) 191.22 183.86 183.29
Vested (in dollars per share) 161.58 160.74 112.53
Forfeited (in dollars per share) 186.63 168.68 150.84
Outstanding - December 31 (in dollars per share) $ 186.12 $ 178.78 $ 168.12
SPSs      
Grants/Units      
Outstanding - January 1 (in shares) 818 707 778
Awarded (in shares) 362 389 221
Vested (in shares) (309) (244) (269)
Forfeited (in shares) (63) (34) (23)
Outstanding - December 31 (in shares) 808 818 707
Weighted Average Fair Value at Award Date      
Outstanding - January 1 (in dollars per share) $ 177.94 $ 160.74 $ 136.57
Awarded (in dollars per share) 191.52 184.72 197.51
Vested (in dollars per share) 159.67 139.27 121.57
Forfeited (in dollars per share) 187.76 178.98 158.16
Outstanding - December 31 (in dollars per share) $ 190.02 $ 177.94 $ 160.74