Restructuring and Cost Reduction Activities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring plan, number of years			5 years
Restructuring and related costs since inception of program	$ 1,393		$ 1,393
Restructuring charges	1	$ 40	239	$ 164
Exit cost reserves	194		194		$ 131
COGS
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(9)	12	26	66
Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	10	28	213	98
Employee related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	523		523
Restructuring charges	31	6	166	26
Exit cost reserves	125		125		102
Asset related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	260		260
Restructuring charges	38	5	68	32
Exit cost reserves	0		0		0
Asset impairment
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	155		155
Restructuring charges	0	0	0	16
Exit cost reserves	0		0		0
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	577		577
Restructuring charges	66	29	138	90
Exit cost reserves	69		69		$ 29
Project K [Member]
Restructuring Cost and Reserve [Line Items]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	134
Restructuring and related costs since inception of program	1,355		1,355
Project K [Member] | Revenue
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	6		6
Project K [Member] | COGS
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	716		716
Project K [Member] | Selling General and Administrative Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	633		633
Project K [Member] | Minimum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	1,500		1,500
Project K [Member] | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	1,600		1,600
Estimated after-tax cash costs for program, including incremental capital investments			$ 1,100
Project K [Member] | U.S. Morning Foods
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			16.00%
Project K [Member] | U.S. Snacks
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			35.00%
Project K [Member] | U.S. Specialty
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			1.00%
Project K [Member] | North America Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			13.00%
Project K [Member] | Europe
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			23.00%
Project K [Member] | Latin America
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			2.00%
Project K [Member] | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			5.00%
Project K [Member] | Employee related costs | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	500		$ 500
Project K [Member] | Asset related costs | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	500		500
Project K [Member] | Other costs | Maximum [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs, expected cost	600		600
Zero Based Budgeting
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	38		38
Restructuring Charges	1			21
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs since inception of program	32		32
Restructuring charges	$ (139)	$ 10	$ (128)	$ 19
Corporate | Project K [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost allocation			5.00%