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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Grants | A summary of the status of the Company’s stock option grants as of December 31, 2019, 2018 and 2017, and changes during the years then ended, is presented in the following table:
| 2019 |  |  | 2018 |  |  | 2017 |
Options | Shares in millions |  |  | Weighted- average exercise price |  |  | Weighted- average remaining contractual life in years |  | Aggregate intrinsic value in millions |  |  | Shares in millions |  |  | Weighted- average exercise price |  |  | Shares in millions |  |  | Weighted- average exercise price |
Outstanding at beginning of year | 16.6 |  |  |  | $ | 113.06 |  |  |  |  |  |  |  | 18.9 |  |  |  | $ | 101.55 |  |  | 21.5 |  |  |  | $ | 92.25 |
Granted | 2.0 |  |  |  | 175.17 |  |  |  |  |  |  |  | 2.7 |  |  |  | 157.95 |  |  | 4.0 |  |  |  | 128.74 |
Exercised | (3.6 | ) |  |  | 97.70 |  |  |  |  |  |  |  | (4.5 | ) |  |  | 89.31 |  |  | (5.6 | ) |  |  | 81.77 |
Forfeited/expired | (0.4 | ) |  |  | 154.65 |  |  |  |  |  |  |  | (0.5 | ) |  |  | 137.08 |  |  | (1.0 | ) |  |  | 118.38 |
Outstanding at end of year | 14.6 |  |  |  | $ | 124.21 |  |  | 5.9 |  |  | $ | 1,074.6 |  |  | 16.6 |  |  |  | $ | 113.06 |  |  | 18.9 |  |  |  | $ | 101.55 |
Exercisable at end of year | 9.2 |  |  |  | $ | 107.51 |  |  | 4.7 |  |  | $ | 826.4 |  |  | 10.0 |  |  |  |  |  | 11.3 |  |  |  |
Summary of Restricted Stock Unit Activity | A summary of the Company’s RSU activity during the years ended December 31, 2019, 2018 and 2017 is presented in the following table:
| 2019 |  |  | 2018 |  |  | 2017 |
RSUs | Shares in millions |  |  | Weighted- average grant date fair value |  |  | Shares in millions |  |  | Weighted- average grant date fair value |  |  | Shares in millions |  |  | Weighted- average grant date fair value |
Nonvested at beginning of year | 1.5 |  |  |  | $ | 132.56 |  |  | 1.6 |  |  |  | $ | 107.34 |  |  | 1.9 |  |  |  | $ | 94.13 |
Granted | 0.6 |  |  |  | 171.48 |  |  | 0.6 |  |  |  | 158.28 |  |  | 0.6 |  |  |  | 123.98 |
Vested | (0.6 | ) |  |  | 116.42 |  |  | (0.6 | ) |  |  | 91.20 |  |  | (0.7 | ) |  |  | 87.18 |
Forfeited | (0.1 | ) |  |  | 153.58 |  |  | (0.1 | ) |  |  | 132.14 |  |  | (0.2 | ) |  |  | 117.24 |
Nonvested at end of year | 1.4 |  |  |  | $ | 150.95 |  |  | 1.5 |  |  |  | $ | 132.56 |  |  | 1.6 |  |  |  | $ | 107.34 |

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