Retirement Plans Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Changes recognized in accumulated other comprehensive loss:
Net amount recognized	$ (45)	$ (6)	$ (16)
Pension Benefits
Changes recognized in accumulated other comprehensive loss:
Actuarial gain	44	6	0
Amortization of net loss	4	3	4
Settlements	12	0	18
Net amount recognized	$ 60	$ 9	$ 22

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Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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- Definition

Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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Other comprehensive income loss defined benefit plan net settlements net of tax.

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