Incentive Stock Programs (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Incentive stock programs, shares reserved for future grants	110,000,000
Total unrecognized compensation cost	$ 264
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period, stock options (in shares)	3,659,969
Stock options outstanding, number of shares	42,297,580
Exercisable options, number of shares	34,724,241
Stock options outstanding, weighted-average remaining life	4 years 6 months
Exercisable options, weighted-average remaining life	3 years 6 months
Stock options outstanding, weighted-average exercise price (in dollars per share)	$ 27.34
Exercisable options, weighted-average exercise price (in dollars per share)	$ 25.38
Aggregate intrinsic value of options outstanding	480
Aggregate intrinsic value of options exercisable	$ 461
Total unrecognized compensation cost, recognition period	3 years
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period, restricted stock (in shares)	545,716
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Grants in period, restricted stock (in shares)	5,248,937

Unrecognized cost of unvested share-based compensation awards.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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Net number of non-option equity instruments granted to participants.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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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.

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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.

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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.

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

-Publisher FASB

-Name Accounting Standards Codification

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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.

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

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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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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.

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