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Stock Plans (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	$ 234	$ 290	$ 350
Stock Plans (Textuals) [Abstract]
Total income tax benefit recognized in the income statement for stock-based compensation arrangements	83	104	127
Restricted Stock Awards [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	190	193	208
Stock Plans (Textuals) [Abstract]
Total unrecognized compensation cost	$ 214
Weighted-average remaining vesting period	2 years 1 month
Stock Option [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	$ 12	13	23
Stock Plans (Textuals) [Abstract]
Total unrecognized compensation cost	$ 3
Weighted-average remaining vesting period	1 year 2 months
Liability-Based Awards [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	$ 32	84	119
Performance And Market-Based Stock Options [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	$ 0	$ 0	$ 1

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Stock based compensation expense.

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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 S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: 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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
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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
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-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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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