Retirement Plans Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	May 31, 2018	Dec. 28, 2019	Sep. 28, 2019	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year		$ 1,000,000		$ 1,000,000
Employer contribution					$ 71,000,000
Defined benefit plans, incremental contributions by employer					35,000,000
Reduction in benefit obligation	$ 33,000,000
Settlement payments				66,000,000
Settlements		(9,000,000)	$ (3,000,000)	(12,000,000)	0	$ (18,000,000)
Actuarial (loss) gain				100,000,000	(97,000,000)	76,000,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan		$ 22,000,000		22,000,000	0	0
Employer contribution				1,000,000	71,000,000	36,000,000
Actuarial (loss) gain				100,000,000	(97,000,000)	76,000,000
Defined Contribution Plan 401K
Defined Benefit Plan Disclosure [Line Items]
Company's contributions to plan				$ 51,000,000	$ 47,000,000	$ 46,000,000
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target asset allocations		35.00%		35.00%
Defined benefit actual plan asset allocations		34.00%		34.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan target asset allocations		65.00%		65.00%
Defined benefit actual plan asset allocations		66.00%		66.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Change in health care cost				$ 1,000,000