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Capital Stock and Stock-Based Compensation Plans | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Capital Stock and Stock-Based Compensation Plans | Capital Stock and Stock-Based Compensation Plans Preference Stock The Company has the authority to issue 50,262,150 shares of preference stock. Stock Repurchases On February 19, 2015, the Board authorized the repurchase of shares of the Company’s common stock having an aggregate purchase price of up to $5,000 under a share repurchase program (the “2015 Program”), which replaced a previously authorized share repurchase program. The Company commenced repurchase of shares of the Company’s common stock under the 2015 Program beginning February 19, 2015. The Board also has authorized share repurchases on an ongoing basis to fulfill certain requirements of the Company’s compensation and benefit programs. The shares are repurchased from time to time in open market or privately negotiated transactions at the Company’s discretion, subject to market conditions, customary blackout periods and other factors. The Company repurchased its common stock at a cost of $1,399 during 2017 under the 2015 Program. The Company may use either authorized and unissued shares or treasury shares to meet share requirements resulting from the exercise of stock options and the vesting of restricted stock unit awards. A summary of common stock and treasury stock activity for the three years ended December 31, is as follows:
|  | Common Stock Outstanding |  | Treasury Stock
Balance, January 1, 2015 |  | 906,712,145 |  |  | 558,994,215 |
Common stock acquired |  | (22,802,784 | ) |  | 22,802,784 |
Shares issued for stock options |  | 7,394,839 |  |  | (7,394,839 | )
Shares issued for restricted stock units and other |  | 1,434,318 |  |  | (1,434,318 | )
Balance, December 31, 2015 |  | 892,738,518 |  |  | 572,967,842 |
Common stock acquired |  | (19,271,304 | ) |  | 19,271,304 |
Shares issued for stock options |  | 8,536,639 |  |  | (8,536,639 | )
Shares issued for restricted stock units and other |  | 1,105,110 |  |  | (1,105,110 | )
Balance, December 31, 2016 |  | 883,108,963 |  |  | 582,597,397 |
Common stock acquired |  | (19,185,828 | ) |  | 19,185,828 |
Shares issued for stock options |  | 9,670,988 |  |  | (9,670,988 | )
Shares issued for restricted stock units and other |  | 1,106,995 |  |  | (1,106,995 | )
Balance, December 31, 2017 |  | 874,701,118 |  |  | 591,005,242 |
Stock-Based Compensation The Company recognizes the cost of employee services received in exchange for awards of equity instruments, such as stock options and restricted stock units, based on the fair value of those awards at the date of grant. The fair value of restricted stock units, generally based on market prices, is amortized on a straight-line basis over the requisite service period. The estimated fair value of stock options on the date of grant is amortized on a straight-line basis over the requisite service period for each separately vesting portion of the award. Awards to employees eligible for retirement prior to the award becoming fully vested are recognized as compensation cost from the grant date through the date that the employee first becomes eligible to retire and is no longer required to provide service to earn the award. The Company has one incentive compensation plan pursuant to which it issues restricted stock units and stock options to employees and shares of common stock and stock options to non-employee directors. The Personnel and Organization Committee of the Board of Directors, which is comprised entirely of independent directors, administers the incentive compensation plan. The total stock-based compensation expense charged against pretax income for this plan was $127, $123 and $125 for the years ended December 31, 2017, 2016 and 2015, respectively. The total income tax benefit recognized on stock-based compensation was approximately $42, $40 and $39 for the years ended December 31, 2017, 2016 and 2015, respectively. Stock-based compensation expense is recorded within Selling, general and administrative expenses in the Corporate segment as these amounts are not included in internal measures of segment operating performance. The Company uses the Black-Scholes option pricing model to determine the fair value of stock option awards. The weighted-average estimated fair value of stock options granted in the years ended December 31, 2017, 2016 and 2015 was $8.37, $8.10 and $7.25, respectively. Fair value is estimated using the Black-Scholes option pricing model with the assumptions summarized in the following table:
|  | 2017 |  | 2016 |  | 2015
Expected term of options |  | 4.5 years |  |  | 4.5 years |  |  | 4.5 years |
Expected volatility rate |  | 16.0 | % |  | 16.7 | % |  | 17.6 | %
Risk-free interest rate |  | 1.8 | % |  | 1.2 | % |  | 1.5 | %
Expected dividend yield |  | 2.2 | % |  | 2.1 | % |  | 2.5 | %
The weighted-average expected term of options granted each year was determined with reference to historical exercise and post-vesting cancellation experience, the vesting period of the awards and the contractual term of the awards, among other factors. Expected volatility incorporates implied share-price volatility derived from exchange traded options on the Company’s common stock. The risk-free interest rate for the expected term of the option is based on the yield of a zero-coupon U.S. Treasury bond with a maturity period equal to the option’s expected term. Restricted Stock Units The Company grants restricted stock unit awards to officers and other employees, including long-term incentive awards. Under the Company’s long-term incentive plan, awards are granted following a three-year performance period. Awards vest at the end of the restriction period, which is generally three years from the date of grant. As of December 31, 2017, approximately 9,870,000 shares of common stock were available for future restricted stock unit awards. A summary of restricted stock unit activity during 2017 is presented below:
|  | Shares (in thousands) |  | Weighted Average Grant Date Fair Value Per Award
Restricted stock units as of January 1, 2017 |  | 2,945 |  |  | $ | 66 |
Activity: |  |  |  |
Granted |  | 916 |  |  | 74 |
Vested |  | (1,057 | ) |  | 62 |
Forfeited |  | (74 | ) |  | 67 |
Restricted stock units as of December 31, 2017 |  | 2,730 |  |  | $ | 70 |
As of December 31, 2017, there was $52 of total unrecognized compensation expense related to unvested restricted stock unit awards, which will be recognized over a weighted-average period of 2.1 years. The total fair value of restricted stock units vested during the years ended December 31, 2017, 2016 and 2015 was $66, $61 and $70, respectively. Stock Options The Company issues non-qualified stock options to non-employee directors, officers and other employees. Stock options generally have a contractual term of six years and vest over three years. As of December 31, 2017, 20,997,000 shares of common stock were available for future stock option grants. A summary of stock option activity during 2017 is presented below:
|  | Shares (in thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (in years) |  | Intrinsic Value of Unexercised In-the-Money Options
Options outstanding, January 1, 2017 |  | 43,692 |  |  | $ | 61 |  |  |  |  |
Granted |  | 7,798 |  |  | 73 |  |  |  |  |
Exercised |  | (10,118 | ) |  | 53 |  |  |  |  |
Forfeited or expired |  | (393 | ) |  | 68 |  |  |  |  |
Options outstanding, December 31, 2017 |  | 40,979 |  |  | 65 |  |  | 4 |  | $ | 420 |
Options exercisable, December 31, 2017 |  | 25,349 |  |  | $ | 62 |  |  | 3 |  | $ | 351 |
As of December 31, 2017, there was $45 of total unrecognized compensation expense related to unvested options, which will be recognized over a weighted-average period of 1.5 years. The total intrinsic value of options exercised during the years ended December 31, 2017, 2016 and 2015 was $201, $221 and $200, respectively. The benefits of tax deductions in excess of grant date fair value resulting from the exercise of stock options and vesting of restricted stock unit awards for the years ended December 31, 2017, 2016 and 2015 were $47, $59 and $55, respectively. Through December 31, 2016 these amounts were recognized in equity and were reported as a financing cash flow. Effective January 1, 2017, as a result of the required adoption of ASU No. 2016-09, excess tax benefits from stock-based compensation have been recognized in the provision for income taxes as a discrete item in the quarterly period in which they occur and classified as an operating cash flow. Cash proceeds received from options exercised for the years ended December 31, 2017, 2016 and 2015 were $507, $386 and $299, 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://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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