Investments of Insurance Subsidiaries (Tables)

9 Months Ended

Sep. 30, 2013

Investments Debt And Equity Securities [Abstract]

Schedule of Investments

A summary of our insurance subsidiaries’ investments at September 30, 2013 and December 31, 2012 follows (dollars in millions):

	September 30, 2013
	Amortized Cost		Unrealized Amounts					Fair Value
			Gains		Losses
Debt securities:
States and municipalities	$	383	$	12	$	(2	)	$	393
Auction rate securities		32		—		—			32
Asset-backed securities		13		—		—			13
Money market funds		24		—		—			24
		452		12		(2	)		462
Equity securities		2		1		—			3
	$	454	$	13	$	(2	)		465
Amounts classified as current assets									(63	)
Investment carrying value								$	402

	December 31, 2012
	Amortized Cost		Unrealized Amounts					Fair Value
			Gains		Losses
Debt securities:
States and municipalities	$	395	$	23	$	—		$	418
Auction rate securities		74		—		(6	)		68
Asset-backed securities		14		—		—			14
Money market funds		67		—		—			67
		550		23		(6	)		567
Equity securities		2		1		—			3
	$	552	$	24	$	(6	)		570
Amounts classified as current assets									(55	)
Investment carrying value								$	515

Schedule of Maturities of Investments

Scheduled maturities of investments in debt securities at September 30, 2013 were as follows (dollars in millions):

	Amortized Cost		Fair Value
Due in one year or less	$	41	$	41
Due after one year through five years		176		182
Due after five years through ten years		108		111
Due after ten years		82		83
		407		417
Auction rate securities		32		32
Asset-backed securities		13		13
	$	452	$	462