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


	2024
			Unrealized Amounts
	Amortized Cost		Gains		Losses			Fair Value
Debt securities	$	388	$	—	$	(27	)	$	361
Money market funds and other		296		—		—			296
	$	684	$	—	$	(27	)		657
Amounts classified as current assets									(88	)
Investment carrying value								$	569

NOTE 6 — INVESTMENTS OF INSURANCE SUBSIDIARIES (continued)


	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

At December 31, 2024 and 2023, the investments in debt securities of our insurance subsidiaries were classified as “available-for-sale.” Changes in unrealized gains and losses that are not credit-related are recorded as adjustments to other comprehensive income (loss).

Scheduled maturities of investments in debt securities at December 31, 2024 were as follows (dollars in millions):


	Amortized Cost		Fair Value
Due in one year or less	$	31	$	31
Due after one year through five years		145		140
Due after five years through ten years		147		130
Due after ten years		65		60
	$	388	$	361

The average expected maturity of the investments in debt securities at December 31, 2024 was 4.4 years, compared to the average scheduled maturity of 8.1 years. Expected and scheduled maturities may differ because the issuers of certain securities have the right to call, prepay or otherwise redeem such obligations prior to their scheduled maturity date.