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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Assumptions Used in Options Pricing Model | The assumptions pertaining to options issued during 2019, 2018, and 2017 are shown in the following table.
Year ended December 31, | 2019 | 2018 | 2017
Average option life | 6.5 years |  | 6.5 years |  | 6.0 years |
Future dividend yield | 3.88 | % | 2.28 | % | 1.79 | %
Historical share price volatility | .266 |  | .282 |  | .287 |
Weighted-average risk-free interest rate | 2.5 | % | 2.8 | % | 2.1 | %
Activity, Pricing and Other Information for Stock Options | The following table summarizes activity, pricing and other information for our stock options for the year ended December 31, 2019:
| Number of Options | Weighted-Average Exercise Price Per Option | Weighted-Average Remaining Life | Aggregate Intrinsic Value(a)
Outstanding at December 31, 2018 | 8,123,844 |  | $ | 11.92 |  | 5.3 years | $ | 31 |
Granted | 659,602 |  | 17.51 |  |  |
Exercised | (2,039,208 | ) | 9.07 |  |  |
Lapsed or canceled | (58,430 | ) | 14.94 |  |  |
Outstanding at December 31, 2019 | 6,685,808 |  | $ | 13.32 |  | 5.2 | 47 |
Expected to vest | 1,996,076 |  | 16.42 |  | 7.3 | 8 |
Exercisable at December 31, 2019 | 4,602,472 |  | $ | 11.89 |  | 4.3 | $ | 39 |
(a) | The intrinsic value of a stock option is the amount by which the fair value of the underlying stock exceeds the exercise price of the option.
Activity and Pricing Information for Nonvested Shares in Long-Term Incentive Compensation Program | The following table summarizes activity and pricing information for the nonvested shares in the Program for the year ended December 31, 2019.
| Vesting Contingent on Service Conditions |  | Vesting Contingent on Performance and Service Conditions - Payable in Stock |  | Vesting Contingent on Performance and Service Conditions - Payable in Cash
| Number of Nonvested Shares | Weighted- Average Grant-Date Fair Value |  | Number of Nonvested Shares | Weighted- Average Grant-Date Fair Value |  | Number of Nonvested Shares | Weighted- Average Grant-Date Fair Value
Outstanding at December 31, 2018 | 9,574,950 |  | $ | 16.84 |  |  | 1,294,403 |  | $ | 13.43 |  |  | $ | 3,245,051 |  | $ | 19.29 |
Granted | 5,193,227 |  | 17.51 |  |  | 57,584 |  | 17.51 |  |  | 1,872,519 |  | 20.33 |
Vested | (3,946,285 | ) | 15.27 |  |  | (855,233 | ) | 10.49 |  |  | (1,139,582 | ) | 17.51 |
Forfeited | (525,498 | ) | 17.94 |  |  | (5,565 | ) | 18.96 |  |  | (78,104 | ) | 16.80 |
Outstanding at December 31, 2019 | 10,296,394 |  | $ | 17.73 |  |  | 491,189 |  | $ | 18.87 |  |  | $ | 3,899,884 |  | $ | 20.37 |
Activity and Pricing Information for Nonvested Shares Granted Under Deferred Compensation Plans and Other Restricted Stock Awards | The following table summarizes activity and pricing information for the nonvested shares granted under our deferred compensation plans and these other restricted stock or unit award programs for the year ended December 31, 2019.
| Number of Nonvested Shares | Weighted-Average Grant-Date Fair Value
Outstanding at December 31, 2018 | 3,279,817 |  | $ | 17.36 |
Granted | 997,217 |  | 17.57 |
Dividend equivalents | 19 |  | 17.07 |
Vested | (1,133,600 | ) | 16.60 |
Forfeited | (105,489 | ) | 18.61 |
Outstanding at December 31, 2019 | 3,037,964 |  | $ | 17.67 |

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