Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities Other-than-temporary Impairments (Details)

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Marketable Securities Other-than-temporary Impairments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 25, 2012
Mar. 31, 2013
Mar. 25, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]        
Beginning balance of credit losses $ 19 $ 46 $ 31 $ 46
Reductions in credit losses related to securities the Company intends to sell (6) 0 (6) (1)
Credit losses recognized on securities previously not impaired 0 2 0 2
Additional credit losses recognized on securities previously impaired 0 2 0 3
Reductions in credit losses related to securities sold (5) (4) (17) (4)
Ending balance of credit losses $ 8 $ 46 $ 8 $ 46