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Summary of Significant Accounting Policies Change in Accounting Principle (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
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Sep. 28, 2012
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Sep. 30, 2011
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Sep. 28, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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Jul. 27, 2012
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Jun. 29, 2012
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||||||
| Common Stock - Shares Authorized | 11,200,000,000 | 11,200,000,000 | 11,200,000,000 | 11,200,000,000 | 5,600,000,000 | ||
| Stock split conversion ratio | 2 | ||||||
| Cumulative effect adjustment on retained earnings from change in accounting methodology as of January 1, 2011 | $ 59 | ||||||
| Impact on income before income taxes from a change in accounting methodology | $ 1 | $ 4 | $ 3 | $ 14 | |||