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Stock-based Compensation Plans (Schedule of Stock-based Compensation Arrangements by Share-based Payment Award - Restricted Stock and RSUs) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at end of period 2,800    
Tax benefit realized related to vested awards $ 35 $ 29 $ 30
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at beginning of period 2,478 2,896 3,294
Granted 959 774 1,025
Vested (882) (977) (1,194)
Forfeited (166) (215) (229)
Outstanding at end of period 2,389 2,478 2,896
Weighted-average grant date fair value of stock outstanding at beginning of the period $ 158.66 $ 127.98 $ 106.56
Weighted-average grant date fair value of stock granted 180.05 212.96 152.93
Weighted-average grant date fair value of stock vested 130.35 112.54 91.77
Weighted-average grant date fair value of stock forfeited 172.50 150.67 120.33
Weighted-average grant date fair value of stock outstanding at the end of the period $ 176.73 $ 158.66 $ 127.98
Fair value of restricted stock and RSUs vested $ 160 $ 206 $ 193
Tax benefit realized related to vested awards 30 39 63
Excess Tax Benefits Realized $ 11 $ 18 $ 29