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Capital Stock and Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Feb. 19, 2015 USD ($) | May 10, 2013 plan
Preference Stock [Abstract] |  |  |  |  |
Shares authorized (in shares) | 50,262,150 |  |  |  |
Stock Repurchases [Abstract] |  |  |  |  |
Repurchased stock | $ | $ 1,399 | $ 1,335 | $ 1,551 |  |
Summary of common stock activity [Roll Forward] |  |  |  |  |
Common stock balance, January 1 (in shares) | 883,108,963 | 892,738,518 | 906,712,145 |  |
Common stock acquired (in shares) | (19,185,828) | (19,271,304) | (22,802,784) |  |
Shares issued for stock options (in shares) | 9,670,988 | 8,536,639 | 7,394,839 |  |
Shares issued for restricted stock and other (in shares) | 1,106,995 | 1,105,110 | 1,434,318 |  |
Common stock balance, December 31 (in shares) | 874,701,118 | 883,108,963 | 892,738,518 |  |
Summary Of Treasury Stock Activity [Roll Forward] |  |  |  |  |
Treasury stock balance, January 1 (in shares) | 582,597,397 | 572,967,842 | 558,994,215 |  |
Common stock acquired (in shares) | 19,185,828 | 19,271,304 | 22,802,784 |  |
Shares issued for stock options (in shares) | (9,670,988) | (8,536,639) | (7,394,839) |  |
Shares issued for restricted stock and other (in shares) | (1,106,995) | (1,105,110) | (1,434,318) |  |
Treasury stock balance, December 31 (in shares) | 591,005,242 | 582,597,397 | 572,967,842 |  |
Stock-based compensation [Abstract] |  |  |  |  |
Number of stockholder approved plans, current | plan |  |  |  |  | 1
Total stock-based compensation expense charged against pretax income | $ | $ 127 | $ 123 | $ 125 |  |
Total income tax benefit from stock compensation | $ | $ 42 | $ 40 | $ 39 |  |
Fair Value Assumptions [Abstract] |  |  |  |  |
Weighted-average estimated fair value of stock options granted (in dollars per share) | $ / shares | $ 8.37 | $ 8.10 | $ 7.25 |  |
Expected term (in years) | 4 years 6 months | 4 years 6 months | 4 years 6 months |  |
Expected volatility rate (in hundredths) | 16.00% | 16.70% | 17.60% |  |
Risk-free rate (in hundredths) | 1.80% | 1.20% | 1.50% |  |
Expected dividend yield (in hundredths) | 2.20% | 2.10% | 2.50% |  |
Summary of restricted stock award activity [Roll Forward] |  |  |  |  |
Restricted stock awards - beginning balance (in shares) | 2,945,000 |  |  |  |
Granted (in shares) | 916,000 |  |  |  |
Vested (in shares) | (1,057,000) |  |  |  |
Forfeited (in shares) | (74,000) |  |  |  |
Restricted stock awards - ending balance (in shares) | 2,730,000 | 2,945,000 |  |  |
Weighted average grant date fair value per award [Roll Forward] |  |  |  |  |
Weighted average grant date fair value of restricted stock awards - beginning of period (in dollars per share) | $ / shares | $ 66 |  |  |  |
Weighted average grant date fair value of restricted stock awards - shares granted (in dollars per share) | $ / shares | 74 |  |  |  |
Weighted average grant date fair value of restricted stock awards - shares vested (in dollars per share) | $ / shares | 62 |  |  |  |
Weighted average grant date fair value of restricted stock awards - shares forfeited (in dollars per share) | $ / shares | 67 |  |  |  |
Weighted average grant date fair value of restricted stock awards - end of period (in dollars per share) | $ / shares | $ 70 | $ 66 |  |  |
Summary of stock option plan activity [Roll Forward] |  |  |  |  |
Options - beginning balance (in shares) | 43,692,000 |  |  |  |
Granted (in shares) | 7,798,000 |  |  |  |
Exercised (in shares) | (10,118,000) |  |  |  |
Forfeited or expired (in shares) | (393,000) |  |  |  |
Options - ending balance (in shares) | 40,979,000 | 43,692,000 |  |  |
Options exercisable (in shares) | 25,349,000 |  |  |  |
Additional disclosures pertaining to stock options [Abstract] |  |  |  |  |
Weighted average exercise price of options - beginning of period (in dollars per share) | $ / shares | $ 61 |  |  |  |
Weighted average exercise price of options - shares granted (in dollars per share) | $ / shares | 73 |  |  |  |
Weighted average exercise price of options - shares exercised (in dollars per share) | $ / shares | 53 |  |  |  |
Weighted average exercise price of options - shares forfeited or expired (in dollars per share) | $ / shares | 68 |  |  |  |
Weighted average exercise price of options - end of period (in dollars per share) | $ / shares | 65 | $ 61 |  |  |
Weighted average exercise price of options exercisable - end of period (in dollars per share) | $ / shares | $ 62 |  |  |  |
Weighted average remaining contractual life, options outstanding (in years) | 4 years |  |  |  |
Weighted average remaining contractual life, options exercisable (in years) | 3 years |  |  |  |
Value of unexercised in-the-money options, options outstanding | $ | $ 420 |  |  |  |
Value of unexercised in-the-money options, options exercisable | $ | 351 |  |  |  |
Stock-based compensation, additional disclosures [Abstract] |  |  |  |  |
Tax benefit from exercise of stock options and vesting of restricted stock unit awards | $ | 47 | $ 59 | $ 55 |  |
Proceeds from exercise of stock options | $ | $ 507 | 386 | 299 |  |
Incentive Stock Plans |  |  |  |  |
Additional disclosures pertaining to stock based compensation [Abstract] |  |  |  |  |
Vesting period (in years) | 3 years |  |  |  |
Number of shares available for grant (in shares) | 9,870,000 |  |  |  |
Unrecognized compensation expense | $ | $ 52 |  |  |  |
Unrecognized compensation expense, weighted-average period of recognition in years | 2 years 1 month 6 days |  |  |  |
Total fair value of shares vested | $ | $ 66 | 61 | 70 |  |
Stock Option Plans |  |  |  |  |
Additional disclosures pertaining to stock based compensation [Abstract] |  |  |  |  |
Vesting period (in years) | 3 years |  |  |  |
Number of shares available for grant (in shares) | 20,997,000 |  |  |  |
Unrecognized compensation expense | $ | $ 45 |  |  |  |
Unrecognized compensation expense, weighted-average period of recognition in years | 1 year 6 months |  |  |  |
Stock-based compensation, additional disclosures [Abstract] |  |  |  |  |
Contractual term (in years) | 6 years |  |  |  |
Total intrinsic value of options exercised | $ | $ 201 | $ 221 | $ 200 |  |
Program 2015 |  |  |  |  |
Stock Repurchases [Abstract] |  |  |  |  |
Stock repurchase program, authorized amount | $ |  |  |  | $ 5,000 |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: 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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: 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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: 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=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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(i) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: 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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: 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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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