Employee Benefits - Components of Plan Benefit Expense Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 28, 2019	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Pension
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain		$ 11	$ 30	$ 11	$ 30
Recognized net (gain) loss		23	(36)	34	(47)
Other Nonpension Postretirement
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain		6	0	6	0
Recognized net (gain) loss		(55)	0	(55)	0
UNITED STATES | Pension
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	$ 11
Recognized net (gain) loss	8	$ 15	(3)	$ 26	$ (14)
UNITED STATES | Other Nonpension Postretirement
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain	6
Recognized net (gain) loss	$ (55)
Project K [Member] | Europe | Pension
Defined Benefit Plan Disclosure [Line Items]
Curtailment gain			30
Recognized net (gain) loss			$ (33)
Maximum [Member] | UNITED STATES | Pension
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.50%
Maximum [Member] | UNITED STATES | Other Nonpension Postretirement
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.50%
Minimum [Member] | UNITED STATES | Pension
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.00%
Minimum [Member] | Cookies, fruit and fruit-flavored snacks, pie crusts and ice cream cones businesses | UNITED STATES | Other Nonpension Postretirement
Defined Benefit Plan Disclosure [Line Items]
Expected return on plan assets	7.00%