Stock Plans (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	$ 290	$ 350	$ 297
Stock Plans (Textuals) [Abstract]
Total income tax benefit recognized in the income statement for stock-based compensation arrangements	104	127	107
Restricted Stock Awards [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	193	208	197
Stock Plans (Textuals) [Abstract]
Total unrecognized compensation cost	211
Weighted-average remaining vesting period	1 year 4 months 0 days
Stock Option [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	13	23	29
Stock Plans (Textuals) [Abstract]
Total unrecognized compensation cost	6
Weighted-average remaining vesting period	2 years 1 month 0 days
Liability-Based Awards [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	84	119	70
Performance And Market-Based Stock Options [Member]
Stock Based Compensation Expense [Abstract]
Stock-based compensation expense	$ 0	$ 0	$ 1

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- Definition

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

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-Name Accounting Standards Codification

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-Name Staff Accounting Bulletin (SAB)

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Unrecognized cost of unvested share-based compensation awards.

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- Definition

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

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