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Capital Stock and Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule Of Common And Treasury Stock Activity | 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 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions | 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 | %
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | 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 |
Schedule of Share-based Compensation, Stock Options, Activity | 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 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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