Exhibit 12.1

Computation of Ratio of Earnings to Combined Fixed Charges and Preferred Stock Dividends

									Four Months Ended December 31, 2013			Eight Months Ended August 31, 2013		Year Ended December 31, 2012
	Years Ended December 31,
(in millions)	2016			2015		2014
Income (loss) from continuing operations before income taxes	$	78		$	2	$	(49	)	$	(55	)	$	2,406	$	(1,610	)
Series A Preferred Stock dividends		(3	)		—		—			—			—		—
Income (loss) from continuing operations before income taxes attributable to common stockholders		75			2		(49	)		(55	)		2,406		(1,610	)
Adjustments:
Interest expense		60			63		62			22			106		139
Interest component of rental expense (1)		9			10		13			5			12		20
Amortization of capitalized interest		—			—		—			—			—		2
Series A Preferred Stock dividends		3			—		—			—			—		—
Earnings available for fixed charges	$	147		$	75	$	26		$	(28	)	$	2,524	$	(1,449	)
Fixed charges:
Interest expense		60			63		62			22			106		139
Interest component of rental expense (1)		9			10		13			5			12		20
Capitalized interest		—			2		3			—			—		1
Series A Preferred Stock dividends		3			—		—			—			—		—
Total fixed charges and preferred stock dividends	$	72		$	75	$	78		$	27		$	118	$	160
Ratio of earnings to combined fixed charges and preferred stock dividends		2.0			1.0		*			**			21.4		***

⁽¹⁾ Interest component of rental expense is estimated to equal 1/3 of such expense, which is considered a reasonable approximation of the interest factor.

* Earnings for the year ended December 31, 2014 were inadequate to cover fixed charges. The coverage deficiency was $52 million.

** Earnings for the four months ended December 31, 2013 were inadequate to cover fixed charges. The coverage deficiency was $55 million.

*** Earnings for the year ended December 31, 2012 were inadequate to cover fixed charges. The coverage deficiency was $1,609 million.