Available for Sale Debt Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 9,912	$ 10,084
Unrealized Gain	6	119
Unrealized Loss	834	109
Fair Value	9,084	10,094
Tax exempt bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37	269
Unrealized Gain	0	2
Unrealized Loss	0	0
Fair Value	37	271
Taxable Bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,705	9,644
Unrealized Gain	6	109
Unrealized Loss	830	108
Fair Value	8,881	9,645
Restricted Investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	170	171
Unrealized Gain	0	8
Unrealized Loss	4	1
Fair Value	$ 166	$ 178