Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018
Income Tax Contingency [Line Items]
Effective income tax rate		27.00%	15.00%	22.00%	14.00%
Income tax benefit related to transition tax liability		$ 16
Discrete tax benefit					$ 44
Accrued income taxes		294		$ 294		$ 48
Income taxes paid	$ 260			211	$ 163
Unrecognized tax benefits		86		86		$ 97
Unrecognized tax benefits that would affect the effective income tax rate		78		78
Other current liabilities
Income Tax Contingency [Line Items]
Unrecognized tax benefits		19		19
Projected additions to unrecognized tax benefits		2		2
Cookies, fruit and fruit-flavored snacks, pie crusts and ice cream cones businesses
Income Tax Contingency [Line Items]
Accrued income taxes		60		60
Cookies, fruit and fruit-flavored snacks, pie crusts and ice cream cones businesses | Deferred tax liability
Income Tax Contingency [Line Items]
Accrued income taxes		$ 200		$ 200