Restructuring and Cost Reduction Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring plan, number of years			5 years
Restructuring and related costs since inception of program	$ 664		$ 664
Restructuring and related cost, incurred cost	90	$ 78	158	$ 132
Exit cost reserves	78		78		$ 110
Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost			(2)
Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost	65	31	97	56
Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, incurred cost	25	47	59	76
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	90		90
Restructuring and related cost, incurred cost	24	7	47	10
Exit cost reserves	2		2		0
Employee related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	230		230
Restructuring and related cost, incurred cost	16	35	33	52
Exit cost reserves	65		65		96
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	239		239
Restructuring and related cost, incurred cost	32	36	60	70
Exit cost reserves	11		11		14
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	105		105
Restructuring and related cost, incurred cost	18	0	18	0
Exit cost reserves	0		$ 0		$ 0
Project K
Restructuring Cost and Reserve [Line Items]
Restructuring plan, number of years			4 years
Restructuring and related costs since inception of program	664		$ 664
Project K | Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	(4)		(4)
Project K | Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	423		423
Project K | Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	237		237
Project K | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	1,200		1,200
Estimated after-tax cash costs for program, including incremental capital investments			900
Project K | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	1,400		1,400
Estimated after-tax cash costs for program, including incremental capital investments			$ 1,100
Project K | U.S. Morning Foods
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			18.00%
Project K | U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			12.00%
Project K | U.S. Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			1.00%
Project K | North America Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			9.00%
Project K | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			14.00%
Project K | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			3.00%
Project K | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			6.00%
Project K | Asset related costs | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	450		$ 450
Project K | Asset related costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	500		500
Project K | Employee related costs | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	425		425
Project K | Employee related costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	475		475
Project K | Other costs | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	325		325
Project K | Other costs | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	425		425
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	99		99
Restructuring and related cost, incurred cost	$ 14	$ 20	$ 34	$ 30
Corporate | Project K
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			37.00%