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Net Income Per Common Share - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Dec. 28, 2018
Sep. 28, 2018
Dec. 29, 2017
Sep. 29, 2017
Dec. 28, 2018
Dec. 29, 2017
Earnings Per Share [Abstract]            
Net income (loss) $ (487) $ 511 $ (823) $ 681 $ 24 $ (142)
Weighted average shares outstanding:            
Basic (in shares) 290   296   291 295
Employee stock options, RSUs, PSUs, ESPP (in shares) 0   0   5 0
Diluted (in shares) 290   296   296 295
Income (loss) per common share            
Basic (in dollars per share) $ (1.68)   $ (2.78)   $ 0.08 $ (0.48)
Diluted (in dollars per share) $ (1.68)   $ (2.78)   $ 0.08 $ (0.48)
Anti-dilutive potential common shares excluded (in shares)         8