Retirement Plans Fair Value of Defined Benefit Plans' Assets by Asset Fair Value Hierarchy Level (Details) - USD ($) $ in Millions	Jan. 02, 2021	Dec. 28, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,112	$ 923
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	3
Domestic Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56	46
International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
International Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29	26
Domestic Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	292	248
International Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36	38
U.S. Governmental Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53	6
Other Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	2
Securities at Fair Values, Excluding NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	478	371
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	3
Level 1 | Domestic Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56	46
Level 1 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
Level 1 | International Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29	26
Level 1 | Domestic Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | International Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | U.S. Governmental Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Other Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 1 | Securities at Fair Values, Excluding NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	94	77
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Domestic Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | International Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 2 | Domestic Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	292	248
Level 2 | International Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36	38
Level 2 | U.S. Governmental Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53	6
Level 2 | Other Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	2
Level 2 | Securities at Fair Values, Excluding NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	384	294
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Domestic Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | International Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Domestic Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | International Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | U.S. Governmental Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Other Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Level 3 | Securities at Fair Values, Excluding NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Fair Value Hierarchy | Common collective trust funds, Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11	16
Fair Value Hierarchy | Common collective trust funds, Domestic Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	240	193
Fair Value Hierarchy | Common collective trust funds, International Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	62	50
Fair Value Hierarchy | Common collective trust funds, Treasury STRIPS
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	321	293
Fair Value Hierarchy | Securities Valued at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 634	$ 552