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Accumulated Other Comprehensive Earnings (Losses) (Notes)
3 Months Ended
Apr. 01, 2023
Equity [Abstract]  
Accumulated Other Comprehensive Earnings (Losses) [Text Block] Accumulated Other Comprehensive Earnings (Losses)
Following is a reconciliation of the changes in accumulated other comprehensive earnings (losses) net of income taxes for the three months ended April 1, 2023 and March 26, 2022:
Investments
Postretirement
Benefit
Accumulated
Other
Comprehensive
Earnings (Losses)
(Amounts are in millions)
2023
Balances at December 31, 2022$(618)(609)
Unrealized gain on debt securities98 — 98 
Net other comprehensive earnings98 — 98 
Balances at April 1, 2023$(520)(511)
2022
Balances at December 25, 2021$(12)(5)
Unrealized loss on debt securities(375)— (375)
Net realized gain on debt securities reclassified to investment income(1)— (1)
Net other comprehensive losses(376)— (376)
Balances at March 26, 2022$(369)(12)(381)