Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of Long-term Debt

Long-term debt consisted of the following:

	December 31
($ in millions)	2014		2013
Term loan due March 30, 2016	$	395	$	474
Senior notes due March 15, 2018, 6.875%	—		600
Senior notes due March 15, 2021, 7.125%	600		600
Senior notes due December 15, 2021, 5.000%	600		—
Mississippi economic development revenue bonds due May 1, 2024, 7.81%	84		84
Gulf opportunity zone industrial development revenue bonds due December 1, 2028, 4.55%	21		21
Total long-term debt	1,700		1,779
Less current portion	108		79
Long-term debt, net of current portion	$	1,592	$	1,700

Schedule of Extinguishment of Debt [Table Text Block]

Details of the debt call and tender offer and the associated loss on early extinguishment of debt were as follows:

	December 31
($ in millions)	2014
Debt call and tender premiums and fees	$	31
Write-off of unamortized debt issuance costs	6
Total loss on early extinguishment of debt	$	37

Schedule of Maturities of Long-term Debt

The aggregate amounts of principal payments due on long-term debt for each of the next five years and thereafter are:

($ in millions)
2015	$	108
2016	287
2017	—
2018	—
2019	—
Thereafter	1,305
Total long-term debt	$	1,700