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Stock Incentive Plans | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock Incentive Plans | Stock Incentive Plans The Company's stock incentive plans allow for the granting of restricted stock or restricted stock unit awards and options to purchase common stock. Both incentive stock options and nonqualified stock options can be awarded under the plans. However, an immaterial amount of options were granted, exercised, or outstanding in 2018. The plans have 11 million shares available for future awards. Compensation expense for stock options and restricted stock unit awards is recognized on a straight-line basis over the vesting period, generally three to five years for stock options and one to three years for restricted stock or restricted stock unit awards. Vesting is accelerated by one year for individuals who qualify under the Company's retirement eligible provisions. Certain restricted stock unit awards contain performance-based as well as service-based provisions. Certain awards provide for accelerated vesting if there is a change in control as defined in the plans. The total compensation cost that has been charged against income for the stock incentive plans was $145 million, $135 million and $148 million for the years ended December 31, 2018, 2017 and 2016, respectively. The total income tax benefit recognized in the income statement for stock-based compensation arrangements was $34 million, $50 million and $67 million for the years ended December 31, 2018, 2017 and 2016, respectively. A summary of the Company's non-vested restricted stock and restricted stock unit shares as of December 31, 2018, and changes during the year ended December 31, 2018, is presented below (shares in thousands):
| Shares |  | Weighted Average Grant Date Fair Value
Non-vested balance as of December 31, 2017 | 8,338 |  |  | $ | 34.65 |
Granted | 2,710 |  |  | 65.31 |
Vested | (3,299 | ) |  | 34.26 |
Forfeited | (384 | ) |  | 32.45 |
Non-vested balance as of December 31, 2018 | 7,365 |  |  | $ | 47.42 |
The total fair value of restricted stock and restricted stock units vested during the years ended December 31, 2018, 2017 and 2016, was $209 million, $174 million and $147 million, respectively. As of December 31, 2018, there was $265 million of total unrecognized compensation cost related to non-vested share-based compensation arrangements granted under the plans; that cost is expected to be recognized over a weighted-average period of 2.3 years. The Company maintains an employee stock purchase plan and issued 256 thousand shares, 258 thousand shares, and 236 thousand shares in 2018, 2017 and 2016, respectively.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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