Temporarily Impaired Available for Sale Debt Securities by Time Period Impaired (Details) - USD ($) $ in Millions	Dec. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months	$ 1,306	$ 3,856
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3	201
Continuous Unrealized Loss Position, 12 Months or Longer	7,921	4,642
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	574	633
Debt Securities, Unrealized Loss Position	9,227	8,498
Debt Securities, Unrealized Loss Position, Accumulated Loss	577	834
Taxable Bonds
Debt Securities, Available-for-sale [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months	1,276	3,705
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2	199
Continuous Unrealized Loss Position, 12 Months or Longer	7,845	4,627
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	572	631
Debt Securities, Unrealized Loss Position	9,121	8,332
Debt Securities, Unrealized Loss Position, Accumulated Loss	574	830
Restricted Investments
Debt Securities, Available-for-sale [Line Items]
Continuous Unrealized Loss Position, Less than 12 Months	30	151
Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	2
Continuous Unrealized Loss Position, 12 Months or Longer	76	15
Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	2	2
Debt Securities, Unrealized Loss Position	106	166
Debt Securities, Unrealized Loss Position, Accumulated Loss	$ 3	$ 4