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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of Stock Options | The following is a summary of our stock option activity:
| Number of Options (in thousands) |  | Weighted Average Exercise Price per Option
Outstanding at January 1, 2017 | 3,879 |  |  | $ | 36.05 |
Granted | 731 |  |  | 57.34 |
Exercised | (597 | ) |  | 27.97 |
Outstanding at December 31, 2017 | 4,013 |  |  | 41.13 |
Granted | 535 |  |  | 67.23 |
Exercised | (908 | ) |  | 34.84 |
Forfeited | (30 | ) |  | 58.01 |
Outstanding at December 31, 2018 | 3,610 |  |  | 46.44 |
Granted | 493 |  |  | 76.16 |
Exercised | (598 | ) |  | 38.96 |
Forfeited | (4 | ) |  | 77.58 |
Outstanding at December 31, 2019 | 3,501 |  |  | 51.87 |
Schedule of Stock Options Outstanding And Exercised | Details of stock options outstanding as of December 31, 2019 are as follows:
| Number of Options (in thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (Years) |  | Aggregate Intrinsic Value (In millions)
Vested or expected to vest | 3,501 |  |  | $ | 51.87 |  |  | 5.9 |  | $ | 142 |
Exercisable | 2,445 |  |  | $ | 44.35 |  |  | 4.9 |  | $ | 118 |
Details of stock options exercised during 2019, 2018 and 2017 are as follows:
|  | Year Ended December 31,
Options exercised: |  | 2019 |  | 2018 |  | 2017
Total intrinsic value of options exercised (in millions) |  | $ | 26 |  |  | $ | 36 |  |  | $ | 22 |
|  | As of December 31,
Options outstanding: |  | 2019 |  | 2018 |  | 2017
Number of options exercisable (in millions) |  | 2.4 |  |  | 2.6 |  |  | 3.0 |
Weighted-average exercise price |  | $ | 44.35 |  |  | $ | 40.22 |  |  | $ | 36.36 |
Schedule of Stock Options Valuation Assumptions | During 2019, 2018 and 2017, we used the assumptions in the table below to compute the value:
|  | Year Ended December 31,
Assumptions: |  | 2019 |  | 2018 |  | 2017
Risk-free interest rate |  | 2.49 | % |  | 2.67 | % |  | 1.84 | %
Expected life in years |  | 5.9 |  |  | 6.0 |  |  | 5.0 |
Expected volatility |  | 20 | % |  | 20 | % |  | 21 | %
Expected dividend yield |  | 1.44 | % |  | 1.43 | % |  | 1.40 | %
Estimated weighted-average fair value of options granted per share |  | $ | 15.45 |  |  | $ | 14.08 |  |  | $ | 10.50 |
Schedule of Nonvested Restricted Stock Options | The following is a summary of nonvested restricted shares under all plans discussed above:
| Number of Restricted Stock Shares (in thousands) |  | Weighted Average Grant-Date Fair Value per Share
Nonvested at January 1, 2017 | 6,436 |  | $ | 45.86 |
Granted | 3,274 |  | 57.61 |
Vested | (3,509) |  | 44.64 |
Forfeited | (453) |  | 52.38 |
Nonvested at December 31, 2017 | 5,748 |  | 52.78 |
Granted | 1,994 |  | 67.88 |
| Number of Restricted Stock Shares (in thousands) |  | Weighted Average Grant-Date Fair Value per Share
Vested | (2,819) |  | 50.21 |
Forfeited | (453) |  | 58.42 |
Nonvested at December 31, 2018 | 4,470 |  | 60.56 |
Granted | 1,697 |  | 76.85 |
Vested | (2,269) |  | 57.92 |
Forfeited | (231) |  | 67.66 |
Nonvested at December 31, 2019 | 3,667 |  | 69.29 |
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Time-based restricted stock units granted (in thousands) (1) |  | 997 |  |  | 1,153 |  |  | 2,364 |
Total fair value of restricted stock vested under all restricted stock plans (in millions) |  | $ | 173 |  |  | $ | 206 |  |  | $ | 206 |
(1) The remaining shares granted are performance-based.

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