Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies Share-Based Compensation (Details)

v3.10.0.1
Significant Accounting Policies Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 24, 2017
Sep. 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation expense before income taxes $ 883 $ 914 $ 943
Related income tax benefit (140) (161) (190)
Share-based compensation expense, net of income taxes 743 753 753
Cost of revenues [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation expense before income taxes 38 38 40
Research and development [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation expense before income taxes 594 588 614
Selling, general and administrative expenses [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Share-based compensation expense before income taxes $ 251 $ 288 $ 289
Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
RSUs granted, weighted average grant date fair value $ 62.61 $ 66.54 $ 53.56
Annual pre-vesting forfeiture rate 6.00% 5.00% 4.00%