Pensions and Other Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Retirement Plans
Components of net periodic benefit cost
Service cost	$ 949	$ 1,037	$ 882
Interest cost	927	988	1,018
Expected return on plan assets	(1,962)	(1,809)	(1,607)
Amortization of prior service cost (credit)	1	2	6
Amortization of net transition obligation	0	0	1
Recognized actuarial losses	496	745	460
Curtailments and settlements	11	8	(17)
Net periodic benefit cost	422	971	743
Other Benefit Plans
Components of net periodic benefit cost
Service cost	224	257	211
Interest cost	158	186	197
Expected return on plan assets	(6)	(7)	(7)
Amortization of prior service cost (credit)	(34)	(33)	(34)
Amortization of net transition obligation	0	0	0
Recognized actuarial losses	135	201	136
Curtailments and settlements	0	0	0
Net periodic benefit cost	$ 477	$ 604	$ 503