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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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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.

+ References

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

-Publisher FASB

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-Paragraph 2

-Subparagraph (c)(2)(iii)(3)

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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).

+ References

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

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-Subparagraph (c)(2)(iii)(1)

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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).

+ References

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

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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.

+ 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)

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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.

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

-Publisher FASB

-Name Accounting Standards Codification

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

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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

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-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

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Weighted average price of options that were either forfeited or expired.

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-Name Accounting Standards Codification

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- Definition

Net number of share options (or share units) granted during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Name Accounting Standards Codification

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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No definition available.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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Number of share options (or share units) exercised during the current period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

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Stock-based compensation - Stock options and RSUs outstanding (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Option
Stock Options, Shares
Exercised (in shares)	(19,503,382)	(45,507,711)	(22,409,816)
Employee Stock Option \| Long-term incentive and director compensation plans
Stock Options, Shares
Options outstanding, Beginning balance (in shares)	64,930,540
Granted (in shares)	14,053,185
Forfeited and expired (in shares)	(1,832,897)
Exercised (in shares)	(19,503,382)
Options outstanding, Ending balance (in shares)	57,647,446
Stock Options, Weighted Average Exercise Price per Share
Weighted-average exercise price, Outstanding, Beginning of period (in dollars per share)	28.98
Weighted-average exercise price, Granted (in dollars per share)	44.11
Weighted-average exercise price, Expired and forfeited (in dollars per share)	36.54
Weighted-average exercise price, Exercised (in dollars per share)	27.75
Weighted-average exercise price, Outstanding, End of period (in dollars per share)	32.84
Restricted Stock Units (RSUs)
Restricted Stock Units, Shares
Vested RSUs (in shares)	(5,609,627)	(5,741,981)	(4,182,928)
Restricted Stock Units (RSUs) \| Long-term incentive and director compensation plans
Restricted Stock Units, Shares
Awards outstanding other than options, Beginning balance (in shares)	20,892,022
Granted (in shares)	3,184,237
Vested RSUs (in shares)	(5,609,627)
Expired and forfeited (in shares)	(1,162,817)
Awards outstanding other than options, Ending balance (in shares)	17,303,815	20,892,022
Restricted Stock Units, Weighted Average Grant Date Fair Value per Share
Weighted-average grant date fair value, Beginning of period (in dollars per share)	29.94
Weighted-average grant-date fair value, Granted (in dollars per share)	44.71	33.70	31.60
Weighted-average grant date fair value, Vested RSUs (in dollars per share)	23.68
Weighted-average grant date fair value, Expired and forfeited (in dollars per share)	33.22
Weighted-average grant date fair value, Ending of period (in dollars per share)	34.47	29.94