Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Details)

v3.3.1.900
Marketable Securities (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 28, 2014
Dec. 27, 2015
Sep. 27, 2015
Schedule of Marketable Securities [Line Items]      
Total marketable securities - Current   $ 9,615 $ 9,761
Total marketable securities - Noncurrent   $ 14,063 13,626
Effective ownership interest in debt fund (fair value option)   22.00%  
Net losses recognized on debt securities classified as trading held at the end of the period $ 12    
Ending balance of the credit loss portion of other-than-temporary impairments on debt securities   $ 22  
Trading Securities [Abstract]      
Trading - Current   0 0
Trading - Noncurrent   640 618
Available-for-sale Securities [Abstract]      
Available-for-sale - Current   9,615 9,761
Available-for-sale - Noncurrent   12,840 12,228
U.S. Treasury securities and government-related securities [Member]      
Trading Securities [Abstract]      
Trading - Current   0 0
Trading - Noncurrent   61 12
Available-for-sale Securities [Abstract]      
Available-for-sale - Current   160 156
Available-for-sale - Noncurrent   782 691
Corporate bonds and notes [Member]      
Trading Securities [Abstract]      
Trading - Current   0 0
Trading - Noncurrent   300 364
Available-for-sale Securities [Abstract]      
Available-for-sale - Current   7,942 7,926
Available-for-sale - Noncurrent   7,568 7,112
Mortgage- and asset-backed and auction rate securities [Member]      
Trading Securities [Abstract]      
Trading - Current   0 0
Trading - Noncurrent   279 242
Available-for-sale Securities [Abstract]      
Available-for-sale - Current   1,339 1,302
Available-for-sale - Noncurrent   299 263
Equity and preferred securities and equity funds [Member]      
Available-for-sale Securities [Abstract]      
Available-for-sale - Current   174 377
Available-for-sale - Noncurrent   1,321 1,253
Debt funds [Member]      
Available-for-sale Securities [Abstract]      
Available-for-sale - Current   0 0
Available-for-sale - Noncurrent   2,870 2,909
Fair Value Option [Abstract]      
Fair value option - Current   0 0
Fair value option - Noncurrent   $ 583 $ 780