Annual report pursuant to Section 13 and 15(d)

Income Taxes Unrecognized Tax Benefits (Details)

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Income Taxes Unrecognized Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 25, 2011
Sep. 26, 2010
Changes in the Amount of Unrecognized Tax Benefits [Roll Forward]      
Beginning balance of unrecognized tax benefits $ 96 $ 353 $ 84
Additions based on prior year tax positions 0 64 223
Reductions for prior year tax positions and lapse in statute of limitations (18) (10) (58)
Additions for current year tax positions 10 12 165
Settlements with taxing authorities (2) (323) (61)
Ending balance of unrecognized tax benefits $ 86 $ 96 $ 353