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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2016
Stock-Based Compensation | Note 13 – Stock-Based Compensation During 2016, 2015 and 2014, we recorded non-cash stock-based compensation expense totaling $149 million, $133 million and $154 million, which is included as a component of other unallocated, net on our consolidated statements of earnings. The net impact to earnings for the respective years was $97 million, $86 million and $100 million. As of December 31, 2016, we had $83 million of unrecognized compensation cost related to nonvested awards, which is expected to be recognized over a weighted average period of 1.8 years. We received cash from the exercise of stock options totaling $106 million, $174 million and $308 million during 2016, 2015 and 2014. In addition, our income tax liabilities for 2016, 2015 and 2014 were reduced by $219 million, $213 million and $215 million due to recognized tax benefits on stock-based compensation arrangements. Stock-Based Compensation Plans Under plans approved by our stockholders, we are authorized to grant key employees stock-based incentive awards, including options to purchase common stock, stock appreciation rights, restricted stock units (RSUs), performance stock units (PSUs) or other stock units. The exercise price of options to purchase common stock may not be less than the fair market value of our stock on the date of grant. No award of stock options may become fully vested prior to the third anniversary of the grant and no portion of a stock option grant may become vested in less than one year. The minimum vesting period for restricted stock or stock units payable in stock is three years. Award agreements may provide for shorter or pro-rated vesting periods or vesting following termination of employment in the case of death, disability, divestiture, retirement, change of control or layoff. The maximum term of a stock option or any other award is 10 years. At December 31, 2016, inclusive of the shares reserved for outstanding stock options, RSUs and PSUs, we had approximately 12 million shares reserved for issuance under the plans. At December 31, 2016, approximately six million of the shares reserved for issuance remained available for grant under our stock-based compensation plans. We issue new shares upon the exercise of stock options or when restrictions on RSUs and PSUs have been satisfied. RSUs The following table summarizes activity related to nonvested RSUs:
|  | Number of RSUs (In thousands) |  |  | Weighted Average Grant-Date Fair Value Per Share |
Nonvested at December 31, 2013 |  |  | 3,859 |  |  |  | $ 82.42 |
Granted |  |  | 745 |  |  |  | 146.85 |
Vested |  |  | (2,194) |  |  |  | 87.66 |
Forfeited |  |  | (84) |  |  |  | 91.11 |
Nonvested at December 31, 2014 |  |  | 2,326 |  |  |  | $ 97.80 |
Granted |  |  | 595 |  |  |  | 192.47 |
Vested |  |  | (1,642) |  |  |  | 103.30 |
Forfeited |  |  | (43) |  |  |  | 132.28 |
Nonvested at December 31, 2015 |  |  | 1,236 |  |  |  | $ 134.87 |
Granted |  |  | 679 |  |  |  | 206.69 |
Vested |  |  | (1,009) |  |  |  | 137.62 |
Forfeited |  |  | (118) |  |  |  | 203.65 |
Nonvested at December 31, 2016 |  |  | 788 |  |  |  | $ 183.00 |
In 2016, we granted certain employees approximately 0.7 million restricted stock units (RSUs) with a grant-date fair value of $206.69 per RSU. The grant-date fair value of these RSUs is equal to the closing market price of our common stock on the grant date less a discount to reflect the delay in payment of dividend-equivalent cash payments that are made only upon vesting, which is generally three years from the grant date. We recognize the grant-date fair value of RSUs, less estimated forfeitures, as compensation expense ratably over the requisite service period, which is shorter than the vesting period if the employee is retirement eligible on the date of grant or will become retirement eligible before the end of the vesting period. Stock Options We generally recognize compensation cost for stock options ratably over the three-year vesting period. At December 31, 2016 and 2015, there were 3.0 million (weighted average exercise price of $85.82) and 4.2 million (weighted average exercise price of $86.61) stock options outstanding. All of the stock options outstanding are vested as of December 31, 2016 and have a weighted average remaining contractual life of approximately three years and an aggregate intrinsic value of $491 million. There were 1.2 million (weighted average exercise price of $88.61) stock options exercised during 2016. We did not grant stock options to employees during 2016 and 2015. The following table pertains to stock options granted through 2012, in addition to stock options that vested and were exercised in 2016, 2015 and 2014 (in millions):
|  | 2016 |  |  | 2015 |  |  | 2014 |
Grant-date fair value of all stock options that vested |  | $ | — |  |  | $ | 8 |  |  | $ | 18 |
Intrinsic value of all stock options exercised |  |  | 172 |  |  |  | 265 |  |  |  | 297 |
In 2012, we estimated the fair value for stock options at the date of grant using the Black-Scholes option pricing model, which required us to make certain assumptions. We used the following weighted average assumptions in the model: risk-free interest rate of 0.78%, dividend yield of 5.40%, a five year historical volatility factor of 0.28 and an expected option life of five years. PSUs In 2016, we granted certain employees PSUs with an aggregate target award of approximately 0.1 million shares of our common stock. The PSUs vest three years from the grant date based on continuous service, with the number of shares earned (0% to 200% of the target award) depending upon the extent to which we achieve certain financial and market performance targets measured over the period from January 1, 2016 through December 31, 2018. About half of the PSUs were valued at $206.37 per PSU in a manner similar to RSUs mentioned above as the financial targets are based on our operating results. We recognize the grant-date fair value of these PSUs, less estimated forfeitures, as compensation expense ratably over the vesting period based on the number of awards expected to vest at each reporting date. The remaining PSUs were valued at $212.37 per PSU using a Monte Carlo model as the performance target is related to our total shareholder return relative to our peer group. We recognize the grant-date fair value of these awards, less estimated forfeitures, as compensation expense ratably over the vesting period.

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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 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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