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SHARE-BASED COMPENSATION | 9 Months Ended
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Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
SHARE-BASED COMPENSATION | SHARE-BASED COMPENSATION As of September 30, 2017, the Company has outstanding share-based awards under the Aflac Incorporated Long-Term Incentive Plan (the “Plan”). Share-based awards are designed to reward employees for their long-term contributions to the Company and provide incentives for them to remain with the Company. The number and frequency of share-based awards are based on competitive practices, operating results of the Company, government regulations, and other factors. The Plan, as amended on February 14, 2017, allows for a maximum number of shares issuable over its term of 37.5 million shares including 19 million shares that may be awarded in respect of awards other than options or stock appreciation rights. If any awards granted under the Plan are forfeited or are terminated before being exercised or settled for any reason other than tax forfeiture, then the shares underlying the awards will again be available under the Plan. The Plan allows awards to Company employees for incentive stock options (ISOs), non-qualifying stock options (NQSOs), restricted stock, restricted stock units, and stock appreciation rights. Non-employee directors are eligible for grants of NQSOs, restricted stock, and stock appreciation rights. As of September 30, 2017, approximately 20.6 million shares were available for future grants under this plan. The ISOs and NQSOs have a term of 10 years, and the share-based awards generally vest upon time-based conditions or time and performance-based conditions. Time-based vesting generally occurs after three years. Performance-based vesting conditions generally include the attainment of goals related to Company financial performance. As of September 30, 2017, the only performance-based awards issued and outstanding were restricted stock awards. Stock options and stock appreciation rights granted under the amended Plan have an exercise price of at least 100% of the fair market value of the underlying stock on the grant date and have an expiration date no later than 10 years from the grant date. Time-based restricted stock awards, restricted stock units and stock options granted after January 1, 2017 generally vest on a ratable basis over three years, and awards granted prior to the amendment vest on a three-year cliff basis. The Compensation Committee of the Board of Directors has the discretion to determine vesting schedules. Share-based awards granted to U.S.-based grantees are settled with authorized but unissued Company stock, while those issued to Japan-based grantees are settled with treasury shares. The following table provides information on stock options outstanding and exercisable at September 30, 2017.
| Stock Option Shares (in thousands) |  | Weighted-Average Remaining Term (in years) |  | Aggregate Intrinsic Value (in millions) |  | Weighted-Average Exercise Price Per Share
Outstanding |  | 4,181 |  |  |  |  | 5.4 |  |  |  | $ | 108 |  |  |  |  | $ | 55.61 |  |
Exercisable |  | 2,563 |  |  |  |  | 3.6 |  |  |  | 79 |  |  |  |  | 50.73 |  |
The Company received cash from the exercise of stock options in the amount of $48 million during the first nine months of 2017, compared with $59 million in the first nine months of 2016. The tax benefit realized as a result of stock option exercises and restricted stock releases was $37 million in the first nine months of 2017, compared with $29 million in the first nine months of 2016. As of September 30, 2017, total compensation cost not yet recognized in the Company's financial statements related to restricted stock awards was $43 million, of which $17 million (968 thousand shares) was related to restricted stock awards with a performance-based vesting condition. The Company expects to recognize these amounts over a weighted-average period of approximately 1.1 years. There are no other contractual terms covering restricted stock awards once vested. The following table summarizes restricted stock activity during the nine-month period ended September 30.
(In thousands of shares) |  | Shares |  | Weighted-Average Grant-Date Fair Value Per Share
Restricted stock at December 31, 2016 |  | 1,868 |  |  |  | $ | 61.76 |  |
Granted in 2017 |  | 555 |  |  |  | 72.85 |  |
Canceled in 2017 |  | (79 | ) |  |  | 64.22 |  |
Vested in 2017 |  | (486 | ) |  |  | 62.22 |  |
Restricted stock at September 30, 2017 |  | 1,858 |  |  |  | $ | 64.71 |  |
In February 2017, the Company granted 253 thousand performance-based stock awards, which are contingent on the achievement of the Company's financial performance metrics and its market-based conditions. On the date of grant, the Company estimated the fair value of restricted stock awards with market-based conditions using a Monte Carlo simulation model. The model discounts the value of the stock at the assumed vesting date based on the risk-free interest rate. Based on estimates of actual performance versus the vesting thresholds, the calculated fair value percentage pay-out estimate will be updated each quarter. The Company uses third-party analyses to assist in developing the assumptions used in, as well as calibrating, a Monte Carlo simulation model. The Company is responsible for determining the assumptions used in estimating the fair value of its share-based payment awards. On January 1, 2017, the Company adopted accounting guidance related to employee share-based payment accounting, which requires an entity to elect whether to use estimates of forfeitures, or to account for forfeitures as they occur, using modified retrospective application. The Company has made an entity-wide accounting policy election to estimate the number of awards that are expected to vest (consistent with the Company's prior policy). The election and adoption of this guidance did not have a significant impact on the Company's financial position, results of operations, or disclosures. For additional information on the Company's long-term share-based compensation plans and the types of share-based awards, see Note 12 of the Notes to the Consolidated Financial Statements included in the 2016 Annual Report.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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