Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 02, 2016	Mar. 28, 2015	Apr. 02, 2016	Mar. 28, 2015
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	$ 79	$ 83	$ 159	$ 166
Interest costs	114	131	229	262
Expected return on plan assets	(186)	(178)	(374)	(356)
Amortization of prior-year service costs	4	4	7	8
Recognized net actuarial loss	60	61	121	123
Net periodic benefit cost	71	101	142	203
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service costs	3	3	6	7
Interest costs	15	17	30	34
Expected return on plan assets	(11)	(9)	(22)	(19)
Amortization of prior-year service costs	0	(1)	0	(1)
Recognized net actuarial loss	2	2	4	5
Net periodic benefit cost	$ 9	$ 12	$ 18	$ 26