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Accumulated Other Comprehensive Earnings (Losses) (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 01, 2023
Mar. 26, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning of Period $ (609) $ (5)
Unrealized gain (loss) on debt securities 98 (375)
Net realized gain on debt securities reclassified to investment income 0 (1)
Net other comprehensive earnings 98 (376)
Balances at End of Period (511) (381)
Investments [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning of Period (618) 7
Unrealized gain (loss) on debt securities 98 (375)
Net realized gain on debt securities reclassified to investment income   (1)
Net other comprehensive earnings 98 (376)
Balances at End of Period (520) (369)
Postretirement Benefit Obligation [Member]    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balances at Beginning of Period 9 (12)
Net other comprehensive earnings 0 0
Balances at End of Period $ 9 $ (12)