Retirement Plans - Defined Benefit Pension Plan Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
U.S. Plans
Defined Benefit Plan, Net Periodic Pension Benefit Cost
Service cost	$ 9	$ 9	$ 7
Interest cost	50	48	50
Expected return on plan assets	(59)	(67)	(63)
Amortization of net actuarial loss	40	25	25
Net periodic pension benefit cost	$ 40	$ 15	$ 19
Weighted average assumptions used to determine net pension benefit cost during the fiscal year:
Discount rate (as a percent)	4.38%	4.34%	4.84%
Expected return on plan assets (as a percent)	6.97%	7.20%	7.16%
Non-U.S. Plans
Defined Benefit Plan, Net Periodic Pension Benefit Cost
Service cost	$ 48	$ 45	$ 46
Interest cost	52	58	71
Expected return on plan assets	(68)	(72)	(67)
Amortization of net actuarial loss	36	33	23
Other	(6)	(5)	(3)
Net periodic pension benefit cost	$ 62	$ 59	$ 70
Weighted average assumptions used to determine net pension benefit cost during the fiscal year:
Discount rate (as a percent)	2.50%	2.77%	3.38%
Expected return on plan assets (as a percent)	5.98%	6.46%	5.96%
Rate of compensation increase (as a percent)	2.81%	2.86%	2.84%