Pension and Other Benefit Programs - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Defined Benefit Plan Disclosure [Line Items]
New vesting service year requirement effective January 1, 2012		3 years
Pension plans with accumulated benefit obligations in excess of plan assets, projected benefit obligation		$ 13,400	$ 11,484
Pension plans with accumulated benefit obligations in excess of plan assets, accumulated benefit obligation		12,400	10,577
Pension plans with accumulated benefit obligations in excess of plan assets, aggregate fair value of plan assets		9,500	8,536
Total accumulated pension benefit obligations		$ 13,300	$ 11,400
Total accumulated pension benefit obligations, vested percentage		99.00%	98.00%
Additional Capital Contributions Commitment		$ 623
Pension and postretirement medical plans, employer contributions		$ 900
Defined contribution plan, contribution rate		50.00%
Savings and investment plans, employees contribution rate		50.00%
Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, contribution rate		3.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, contribution rate		9.00%
Subsequent Event [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension and postretirement medical plans, employer contributions	$ 1,300
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Postretirement medical plans with accumulated postretirement medical benefit obligations in excess of plan assets, accumulated benefit obligations		$ 14,500	$ 12,400
Postretirement medical plans with accumulated postretirement medical benefit obligations in excess of plan assets, fair value of plan assets		10,400	9,400
Pension and postretirement medical plans, employer contributions		839	337
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Postretirement medical plans with accumulated postretirement medical benefit obligations in excess of plan assets, accumulated benefit obligations		1,800	1,600
Postretirement medical plans with accumulated postretirement medical benefit obligations in excess of plan assets, fair value of plan assets		600	600
Pension and postretirement medical plans, employer contributions		$ 61	$ 48
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year		7.00%	7.00%	7.00%
Rate of increase to which the cost of benefits is assumed to decline (the ultimate trend rate)		4.25%	4.25%	4.25%
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plans, employer contributions		$ 131	$ 110	$ 87
Non-US [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plans, employer contributions		$ 19	$ 19	$ 19