Investments of Insurance Subsidiaries (Tables)

12 Months Ended

Dec. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments

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

	2020
	Amortized Cost		Unrealized Amounts				Fair Value
			Gains		Losses
Debt securities	$	384	$	32	$	—	$	416
Money market funds and other		88		—		—		88
	$	472	$	32	$	—		504
Amounts classified as current assets								(116	)
Investment carrying value							$	388
	2019
	Amortized Cost		Unrealized Amounts				Fair Value
			Gains		Losses
Debt securities	$	359	$	18	$	—	$	377
Money market funds and other		85		—		—		85
	$	444	$	18	$	—		462
Amounts classified as current assets								(147	)
Investment carrying value							$	315

Schedule of Maturities of Investments

Scheduled maturities of investments in debt securities at December 31, 2020 were as follows (dollars in millions):

	Amortized Cost		Fair Value
Due in one year or less	$	4	$	4
Due after one year through five years		147		156
Due after five years through ten years		157		174
Due after ten years		76		82
	$	384	$	416