The amount of common stock available under the plan for future grants and/or issuances.

No definition available.

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Number of common shares issued for each performance unit earned.

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Amount by which the pool of available shares will be reduced for each stock option granted.

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No definition available.

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Amount by which the pool of available shares will be reduced for other types of awards granted.

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No definition available.

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Number of Shares Added Back for Tax Withholding on Full Value Awards

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Weighted average grant date fair value of units outstanding.

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No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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).

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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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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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.

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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.

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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.

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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Stock-based compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2009	May 22, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount by which the pool of available shares will be reduced for each stock option granted	1	1	1
Number of shares added back for tax withholding on full value awards	1.9
The amount of common stock available under the plan for future grants and/or issuances (in shares)	52,000,000
Description of vesting of restricted stock units and stock options	Stock options and RSUs granted on and after April 25, 2011, generally vest in approximately equal amounts on the second, third and fourth anniversaries of the grant date.
Number of common shares issued for each performance unit earned	1	1	1
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The number of shares by which the pool of available shares will be reduced for other types of awards granted	1.9
Weighted average grant date fair value, granted (in usd per share)	115.63	107.01	72.99
Total fair value of units that vested during the year	191	145	139
Units outstanding (in shares)	7,100,000	8,800,000
Units granted (in shares)	2,300,000
Units, vested (in shares)	3,000,000
Weighted average grant date fair value, vested (in usd per share)	63.36
Units, forfeited (in shares)	1,000,000
Weighted average grant date fair value, forfeited (in usd per share)	90.77
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options exercised during the year	228	210	320
Actual tax benefits realized from tax deductions from option exercises	83	77	117
Stock Option and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to nonvested awards	357
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized	1 year 8 months 12 days
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
The number of shares by which the pool of available shares will be reduced for other types of awards granted	1.9
Period over which the grants of equity instruments vest	3 years
Weighted-average risk-free interest rate	0.80%	0.40%	0.50%
Weighted average grant date fair value, granted (in usd per share)	104.47	102.73	78.21
Total fair value of units that vested during the year	587	270	100
Total unrecognized compensation cost related to nonvested awards	133
Weighted average number of years over which compensation cost related to nonvested awards is expected to be recognized	10 months 24 days
Units outstanding (in shares)	5,800,000	6,600,000
Weighted average grant date fair value of units, outstanding	92.66	76.95
Units granted (in shares)	1,700,000
Units, vested (in shares)	3,700,000
Weighted average grant date fair value, vested (in usd per share)	77.89
Units, forfeited (in shares)	500,000
Weighted average grant date fair value, forfeited (in usd per share)	95.01
Granted Prior to April 25, 2011 [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period over which the grants of equity instruments vest	4 years
Granted Prior to April 25, 2011 [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period over which the grants of equity instruments vest	4 years
Granted on April 25, 2011 through April 26, 2012 [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	2.00%
Weighted-average risk-free interest rate	1.00%
Granted on and After April 26, 2010 [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of stock options from date of grant	10 years
Granted Prior to April 26, 2010 [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of stock options from date of grant				7 years
the Amended 2009 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized for issuance					104,000,000