Retirement Plans - Reconciliation of Fair Value Measurements of Level 3 Valuation (Details) - Real estate - Level 3 - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Jan. 01, 2022
Reconciliation for fair value measurements that use significant unobservable inputs (Level 3)
Balance at beginning of year	$ 599	$ 458
Unrealized gains (losses), net	(10)	90
Realized gains, net	11	9
Purchases, sales and settlements, net	(31)	42
Balance at end of year	$ 569	$ 599

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

+ References

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

+ Details

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- Details

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- Details

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