Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

Marketable Securities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 30, 2012
Dec. 25, 2011
Marketable Securities [Abstract]    
Effective ownership interest in debt fund (fair value option) 21.00%  
Increases in fair value of debt fund (fair value option) recognized in investment income $ 10 $ 5
Net gains (losses) recognized on debt securities classified as trading that are still held at the end of the period $ 0 $ (2)