Investments of Insurance Subsidiaries (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Investments

A summary of our insurance subsidiaries’ investments at September 30, 2018 and December 31, 2017 follows (dollars in millions):

	September 30, 2018
	Amortized Cost		Unrealized Amounts					Fair Value
			Gains		Losses
Debt securities	$	343	$	4	$	(2	)	$	345
Money market funds and other		68		—		—			68
	$	411	$	4	$	(2	)		413
Amounts classified as current assets									(46	)
Investment carrying value								$	367

	December 31, 2017
	Amortized Cost		Unrealized Amounts				Fair Value
			Gains		Losses
Debt securities	$	361	$	10	$	—	$	371
Money market funds and other		101		—		—		101
	$	462	$	10	$	—		472
Amounts classified as current assets								(54	)
Investment carrying value							$	418

Schedule of Maturities of Investments

Scheduled maturities of investments in debt securities at September 30, 2018 were as follows (dollars in millions):

	Amortized Cost		Fair Value
Due in one year or less	$	9	$	9
Due after one year through five years		57		58
Due after five years through ten years		210		212
Due after ten years		67		66
	$	343	$	345