Investments (Tables)

9 Months Ended

Sep. 30, 2023

Investments, Debt and Equity Securities [Abstract]

Available For Sale Debt Securities [Table Text Block]

Following is a summary of debt securities as of September 30, 2023 and December 31, 2022:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(Amounts are in millions)
September 30, 2023
Taxable bonds	$	11,373		1		829	10,545
Tax exempt bonds	20			—		—	20
Restricted investments	187			—		5	182
	$	11,580		1		834	10,747
December 31, 2022
Taxable bonds	$	9,705		6		830	8,881
Tax exempt bonds	37			—		—	37
Restricted investments	170			—		4	166
	$	9,912		6		834	9,084

Amortized Cost and Fair Value of Available For Sale Debt Securities by Expected Maturity [Table Text Block]

Following is a summary of the cost and fair value of debt securities by expected maturity as of September 30, 2023 and December 31, 2022:

	September 30, 2023				December 31, 2022
	Cost		Fair Value		Cost		Fair Value
	(Amounts are in millions)
Due in one year or less	$	1,783		1,771		570	566
Due after one year through five years	9,239			8,466		8,355	7,661
Due after five years through ten years	542			495		985	855
Due after ten years	16			15		2	2
	$	11,580		10,747		9,912	9,084

Available For Sale Debt Securities in an Unrealized Loss Position by Time Period Impaired [Table Text Block]

Following is a summary of debt securities with other unrealized losses by the time period impaired as of September 30, 2023 and December 31, 2022:

	Less Than 12 Months				12 Months or Longer			Total
	Fair Value		Unrealized Losses		Fair Value	Unrealized Losses		Fair Value	Unrealized Losses
	(Amounts are in millions)
September 30, 2023
Taxable bonds	$	2,442		29	7,648		800	10,090		829
Restricted investments	62			2	120		3	182		5
	$	2,504		31	7,768		803	10,272		834
December 31, 2022
Taxable bonds	$	3,705		199	4,627		631	8,332		830
Restricted investments	151			2	15		2	166		4
	$	3,856		201	4,642		633	8,498		834

Investment Income (Loss) [Table Text Block]

Following is a summary of investment income (loss) for the three and nine months ended September 30, 2023 and September 24, 2022:

		Three Months Ended					Nine Months Ended
	September 30, 2023			September 24, 2022		September 30, 2023		September 24, 2022
	(Amounts are in millions)
Interest and dividend income		$	101		61		273		173
Net realized (loss) gain on investments		—			(3)		134		(2)
		101			58		407		171
Fair value adjustment, due to net unrealized (loss) gain, on equity securities held at end of period		(144)			(556)		225		(1,495)
Net gain on sale of equity securities previously recognized through fair value adjustment		—			—		(48)		—
		$	(43)		(498)		584		(1,324)