Temporarily Impaired Available for Sale Debt Securities by Time Period Impaired (Details) - USD ($) $ in Millions	Mar. 30, 2024	Dec. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 1,694	$ 1,306
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7	3
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	7,938	7,921
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	579	574
Unrealized Loss Position, Fair Value	9,632	9,227
Unrealized Loss Position, Accumulated Loss	586	577
Taxable bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	1,635	1,276
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	7	2
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	7,876	7,845
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	577	572
Unrealized Loss Position, Fair Value	9,511	9,121
Unrealized Loss Position, Accumulated Loss	584	574
Restricted investments [Member]
Debt Securities, Available-for-sale [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	59	30
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	1
Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	62	76
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2	2
Unrealized Loss Position, Fair Value	121	106
Unrealized Loss Position, Accumulated Loss	$ 2	$ 3