Investments of Insurance Subsidiaries (Tables)

12 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments

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

	2016
	Amortized Cost		Unrealized Amounts					Fair Value
			Gains		Losses
Debt securities:
States and municipalities	$	345	$	9	$	(1	)	$	353
Money market funds		28		—		—			28
		373		9		(1	)		381
Equity securities		1		3		—			4
	$	374	$	12	$	(1	)		385
Amounts classified as current assets									(49	)
Investment carrying value								$	336

	2015
	Amortized Cost		Unrealized Amounts					Fair Value
			Gains		Losses
Debt securities:
States and municipalities	$	428	$	17	$	(1	)	$	444
Money market funds		34		—		—			34
		462		17		(1	)		478
Equity securities		—		4		—			4
	$	462	$	21	$	(1	)		482
Amounts classified as current assets									(50	)
Investment carrying value								$	432

Schedule of Maturities of Investments

Scheduled maturities of investments in debt securities at December 31, 2016 were as follows (dollars in millions):

	Amortized Cost		Fair Value
Due in one year or less	$	91	$	91
Due after one year through five years		95		97
Due after five years through ten years		159		165
Due after ten years		28		28
	$	373	$	381