Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Fair Value Measurements Activity Between Levels of the Fair Value Hierarchy, Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 24, 2017
Sep. 25, 2016
Marketable Securities [Member]    
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Beginning balance of Level 3 $ 43 $ 224
Total realized and unrealized gains or losses included in other comprehensive income (loss) 0 (1)
Issuances 0 0
Purchases 0 2
Sales 0 (106)
Settlements (3) (45)
Transfers into of Level 3 0 0
Transfers out of Level 3 0 (27)
Ending balance of Level 3 40 43
Other Investments [Member]    
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Beginning balance of Level 3 37 13
Total realized and unrealized gains or losses included in other comprehensive income (loss) 8 15
Issuances 0 0
Purchases 111 40
Sales 0 0
Settlements (34) (8)
Transfers into of Level 3 0 0
Transfers out of Level 3 0 0
Ending balance of Level 3 125 37
Other Liabilities [Member]    
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Beginning balance of Level 3 0  
Total realized and unrealized gains or losses included in other comprehensive income (loss) 0  
Issuances 203  
Purchases 0  
Sales 0  
Settlements 0  
Transfers into of Level 3 0  
Transfers out of Level 3 0  
Ending balance of Level 3 196 0
Selling, general and administrative [Member] | Marketable Securities [Member]    
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Total realized and unrealized gains or losses included in earnings 0 0
Selling, general and administrative [Member] | Other Investments [Member]    
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Total realized and unrealized gains or losses included in earnings 0 0
Selling, general and administrative [Member] | Other Liabilities [Member]    
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Total realized and unrealized gains or losses included in earnings (7)  
Investment Income [Member] | Marketable Securities [Member]    
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Total realized and unrealized gains or losses included in earnings 0 (4)
Investment Income [Member] | Other Investments [Member]    
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Total realized and unrealized gains or losses included in earnings 3 $ (23)
Investment Income [Member] | Other Liabilities [Member]    
Activity for Marketable Securities Classified Within Level 3 of the Valuation Hierarchy [Roll Forward]    
Total realized and unrealized gains or losses included in earnings $ 0