Corporate Debt (Tables)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Schedule of Corporate Debt Instruments

Corporate debt at March 31, 2016 and December 31, 2015 is outlined in the following table (dollars in millions):

	Face Value		Discount			Net
March 31, 2016
Interest-bearing notes:
5 3/8% Notes, due 2022	$	540	$	(5	)	$	535
4 5/8% Notes, due 2023	460		(5		)	455
Total interest-bearing notes	1,000		(10		)	990
Non-interest-bearing debt:
0% Convertible debentures, due 2019	3		—			3
Total corporate debt	$	1,003	$	(10	)	$	993

	Face Value		Discount			Net
December 31, 2015
Interest-bearing notes:
5 3/8% Notes, due 2022	$	540	$	(6	)	$	534
4 5/8% Notes, due 2023	460		(5		)	455
Total interest-bearing notes	1,000		(11		)	989
Non-interest-bearing debt:
0% Convertible debentures, due 2019	8		—			8
Total corporate debt	$	1,008	$	(11	)	$	997