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Stock Plans (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	$ 350	$ 297	$ 301
Stock Plans (Textuals) [Abstract]
Total income tax benefit recognized in the income statement for stock-based compensation arrangements	127	107	105
Restricted Stock Awards [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	208	197	176
Stock Plans (Textuals) [Abstract]
Total unrecognized compensation cost	232
Weighted-average remaining vesting period	2 years 1 month 0 days
Stock Option [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	23	29	40
Stock Plans (Textuals) [Abstract]
Total unrecognized compensation cost	14
Weighted-average remaining vesting period	1 year 10 months 0 days
Liability-Based Awards [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	119	70	83
Performance And Market-Based Stock Options [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	$ 0	$ 1	$ 2

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 14.F)

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-Name Accounting Standards Codification

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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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.

+ References

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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income 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

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