Retirement Plans Fair Value of Defined Benefit Plans' Assets by Asset Fair Value Hierarchy Level (Details) - USD ($) $ in Millions	Dec. 31, 2022	Jan. 01, 2022
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 753	$ 1,103
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2
Domestic Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32	44
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	22	26
Domestic Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	216	286
International Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	27	45
U.S. Governmental Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	7
Securities at Fair Values, Excluding NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	309	412
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2
Level 1 | Domestic Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32	44
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	22	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
Level 1 | Securities at Fair Values, Excluding NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56	74
Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		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	216	286
Level 2 | International Corporate Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	27	45
Level 2 | U.S. Governmental Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	7
Level 2 | Securities at Fair Values, Excluding NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	253	338
Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		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 | 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	24	24
Fair Value Hierarchy | Common collective trust funds, Domestic Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	147	219
Fair Value Hierarchy | Common collective trust funds, International Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41	49
Fair Value Hierarchy | Common collective trust funds, Treasury STRIPS
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	164	303
Fair Value Hierarchy | Common collective trust funds, U.S. Governmental Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68
Fair Value Hierarchy | Securities Valued at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 444	$ 691