Exhibit 12

STATEMENT RE: COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(DOLLARS IN MILLIONS)

	Year Ended December 31,
	2013			2014			2015			2016			2017
Earnings
Income (loss) from continuing operations before provision for income taxes	$	346		$	342		$	411		$	(1,715	)	$	(2,833	)
Income from equity investees		(43	)		(48	)		(63	)		(43	)		(16	)
Distributed income from equity investees		59			29			64			40			13
Interest and amortization of deferred finance costs		613			972			973			962			931
Amortization of capitalized interest		4			4			5			9			5
Implicit rental interest expense		70			108			114			112			99
Total earnings	$	1,049		$	1,407		$	1,504		$	(635	)	$	(1,801	)
Fixed Charges
Interest and amortization of deferred finance costs	$	613		$	972		$	973		$	962		$	931
Capitalized interest		10			10			16			9			11
Implicit rental interest expense		70			108			114			112			99
Total fixed charges	$	693		$	1,090		$	1,103		$	1,083		$	1,041
Ratio of earnings to fixed charges		1.51	x		1.29	x		1.36	x		*	x		*	x

* For the years ended December 31, 2017 and 2016, earnings were insufficient to cover fixed charges by approximately $2.8 billion and $1.7 billion, respectively.