Investments of Insurance Subsidiaries (Tables)

12 Months Ended

Dec. 31, 2023

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments

A summary of the insurance subsidiaries’ investments at December 31 follows (dollars in millions):

	2023
			Unrealized Amounts
	Amortized Cost		Gains		Losses			Fair Value
Debt securities	$	404	$	1	$	(29	)	$	376
Money market funds and other		188		—		—			188
	$	592	$	1	$	(29	)		564
Amounts classified as current assets									(87	)
Investment carrying value								$	477

	2022
			Unrealized Amounts
	Amortized Cost		Gains		Losses			Fair Value
Debt securities	$	415	$	—	$	(38	)	$	377
Money market funds and other		96		—		—			96
	$	511	$	—	$	(38	)		473
Amounts classified as current assets									(92	)
Investment carrying value								$	381

Schedule of Maturities of Investments

Scheduled maturities of investments in debt securities at December 31, 2023 were as follows (dollars in millions):

	Amortized Cost		Fair Value
Due in one year or less	$	12	$	12
Due after one year through five years		150		144
Due after five years through ten years		165		148
Due after ten years		77		72
	$	404	$	376