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Accumulated Other Comprehensive Earnings (Losses) (Notes)
 9 Months Ended
Sep. 30, 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 September 30, 2023 and September 24, 2022:
Investments
Postretirement
Benefit
Accumulated
Other
Comprehensive
Earnings (Losses)
(Amounts are in millions)
2023
Balances at July 1, 2023$(585)9 (576)
Unrealized loss on debt securities(37)— (37)
Net other comprehensive losses(37)— (37)
Balances at September 30, 2023$(622)9 (613)
2022
Balances at June 25, 2022$(544)(11)(555)
Unrealized loss on debt securities(119)— (119)
Net realized loss on debt securities reclassified to investment income2 — 2 
Net other comprehensive losses(117)— (117)
Balances at September 24, 2022$(661)(11)(672)
Following is a reconciliation of the changes in accumulated other comprehensive earnings (losses) net of income taxes for the nine months ended September 30, 2023 and September 24, 2022:
Investments
Postretirement
Benefits
Accumulated
Other
Comprehensive
Earnings (Losses)
(Amounts are in millions)
2023
Balances at December 31, 2022$(618)9 (609)
Unrealized loss on debt securities(4)— (4)
Net other comprehensive losses (4)— (4)
Balances at September 30, 2023$(622)9 (613)
2022
Balances at December 25, 2021$7 (12)(5)
Unrealized loss on debt securities(669)— (669)
Net realized loss on debt securities reclassified to investment income1 — 1 
Adjustment to postretirement benefit obligation— 1 1 
Net other comprehensive (losses) earnings(668)1 (667)
Balances at September 24, 2022$(661)(11)(672)