Employee Stock and Benefit Plans (Stock Option Transactions) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Shares Subject to Options
Outstanding, September 27, 2015, Shares Subject to Options	31.3
Granted, Shares Subject to Options	7.1
Exercised, Shares Subject to Options	(5.3)
Expired/forfeited, Shares Subject to Options	(1.7)
Outstanding, October 2, 2016, Shares Subject to Options	31.4	31.3
Exercisable, October 2, 2016, Shares Subject to Options	19.7
Vested and expected to vest, October 2, 2016, Shares Subject to Options	30.0
Weighted Average Exercise Price per Share
Outstanding, September 27, 2015, Weighted Average Exercise Price per Share Beginning Balance	$ 30.59
Granted, Weighted Average Exercise Price per Share	56.12	$ 60.20	$ 39.89
Exercised, Weighted Average Exercise Price per Share	23.16
Expired/forfeited, Weighted Average Exercise Price per Share	51.13
Outstanding, October 2, 2016, Weighted Average Exercise Price per Share Ending Balance	36.51	$ 30.59
Exercisable at October 2, 2016, Weighted Average Exercise Price per Share	26.42
Vested and expected to vest, October 2, 2016, Weighted Average Exercise Price per Share	$ 35.60
Additional Disclosures
Outstanding, Weighted Average Remaining Contractual Life (Years)	5 years 9 months 18 days	5 years 9 months 18 days
Exercisable, October 2, 2016, Weighted Average Remaining Contractual Life (Years)	4 years 2 months 18 days
Vested and expected to vest, October 2, 2016, Weighted Average Remaining Contractual Life (Years)	5 years 7 months 6 days
Aggregate Intrinsic Value
Outstanding, Aggregate Intrinsic Value	$ 589	$ 771
Exercisable, October 2, 2016, Aggregate Intrinsic Value	552
Vested and expected to vest, October 2, 2016, Aggregate Intrinsic Value	$ 587