Annual report pursuant to Section 13 and 15(d)

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

v3.5.0.2
Fair Value Measurements Activity Between Levels of the Fair Value Hierarchy, Assets (Details) - Mortgage- and asset-backed and auction rate securities [Member] - USD ($)
$ in Millions
12 Months Ended
Sep. 25, 2016
Sep. 27, 2015
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Beginning balance of Level 3 $ 224 $ 269
Total realized and unrealized gains or losses included in investment income, net (4) 3
Total realized and unrealized gains or losses included in other comprehensive income (loss) (1) (4)
Purchases 2 69
Sales (106) (46)
Settlements (45) (64)
Transfers out of Level 3 (27) (3)
Ending balance of Level 3 $ 43 $ 224