Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements Activity Between Levels of the Fair Value Hierarchy, Assets (Details)

v2.4.0.6
Fair Value Measurements Activity Between Levels of the Fair Value Hierarchy, Assets (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Mar. 31, 2013
Mar. 25, 2012
Auction Rate Securities [Member]
   
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Beginning balance of Level 3 $ 118 $ 124
Total realized and unrealized gains or losses [Abstract]    
Included in investment income, net 0 0
Included in other comprehensive income 1 0
Purchases 0 0
Sales 0 0
Settlements (35) (4)
Transfers into Level 3 0 0
Ending balance of Level 3 84 120
Other Marketable Securities [Member]
   
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Beginning balance of Level 3 203 27
Total realized and unrealized gains or losses [Abstract]    
Included in investment income, net 3 1
Included in other comprehensive income 3 2
Purchases 127 88
Sales (6) 0
Settlements (36) (8)
Transfers into Level 3 18 5
Ending balance of Level 3 $ 312 $ 115