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Comprehensive Income - Change in AOCI by Component (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 24, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances $ 134,047 $ 128,249 $ 119,355
Total other comprehensive income/(loss) (3,026) (784) 979
Cumulative effect of change in accounting principle 0    
Ending balances 107,147 134,047 128,249
Cumulative Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances (354) (578)  
Other comprehensive income/(loss) before reclassifications (524) 301  
Amounts reclassified from AOCI 0 0  
Tax effect (1) (77)  
Total other comprehensive income/(loss) (525) 224  
Cumulative effect of change in accounting principle (176)    
Ending balances (1,055) (354) (578)
Unrealized Gains/Losses on Derivative Instruments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances (124) 38  
Other comprehensive income/(loss) before reclassifications 672 1,793  
Amounts reclassified from AOCI 486 (1,952)  
Tax effect (253) (3)  
Total other comprehensive income/(loss) 905 (162)  
Cumulative effect of change in accounting principle 29    
Ending balances 810 (124) 38
Unrealized Gains/Losses on Marketable Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances 328 1,174  
Other comprehensive income/(loss) before reclassifications (4,563) (1,207)  
Amounts reclassified from AOCI (20) (99)  
Tax effect 1,177 460  
Total other comprehensive income/(loss) (3,406) (846)  
Cumulative effect of change in accounting principle (131)    
Ending balances (3,209) 328 1,174
Total AOCI      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balances (150) 634 (345)
Other comprehensive income/(loss) before reclassifications (4,415) 887  
Amounts reclassified from AOCI 466 (2,051)  
Tax effect 923 380  
Total other comprehensive income/(loss) (3,026) (784) 979
Cumulative effect of change in accounting principle (278)    
Ending balances $ (3,454) $ (150) $ 634