Stock Compensation (Fair Value Assumptions) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 30, 2013	Mar. 31, 2012
Stock Compensation [Abstract]
Weighted-average expected volatility	15.00%	16.00%
Weighted-average expected term (years)	7 years 5 months 8 days	7 years 6 months 11 days
Weighted-average risk-free interest rate	1.49%	1.60%
Dividend yield	2.90%	3.30%
Total intrinsic value of options exercised	$ 58	$ 8

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Expected term of share-based compensation awards, 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

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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

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- Definition

The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

+ References

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

-Publisher FASB

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- Definition

The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

+ References

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