Exhibit 12.1

Computation of Ratio of Earnings to Fixed Charges

	Six Months Ended June 30,			Year Ended December 31,
(Dollars in millions except ratios)	2017			2015			2015			2014			2013			2012
Income (Loss) from continuing operations before income taxes (a)	$	(557	)	$	(2,868	)	$	(2,099	)	$	(261	)	$	(207	)	$	(339	)
Fixed charges:
Interest expense (b)		289			506			474			507			524			492
Capitalized Interest		—			1			1			5			4			10
Interest factor portion of rentals (c)		27			86			114			132			131			111
Total fixed charges		316			593			589			644			659			613
Less: Capitalized Interest		—			(1	)		(1	)		(5	)		(4	)		(10	)
Earnings before income taxes and fixed charges	$	(241	)	$	(2,276	)	$	(1,511	)	$	378		$	448		$	264
Ratio of earnings to fixed charges (d)		—			—			—			—			—			—

(a) Income from continuing operations before income taxes has been adjusted to include only distributed income of less-than-fifty-percent-owned persons.

(b) Interest expense consists of interest expense incurred from continuing operations and amortization of debt issuance costs.

(c) Interest factor portion of rentals is estimated to be one-third of rental expense.

(d) For the six months ended June 30, 2017 and years ended December 31, 2016, 2015, 2014, 2013 and 2012, earnings, as defined, before fixed charges were inadequate to cover fixed charges by $557 million, $2.9 billion, $2.1 billion, $266 million, $211 million and $349 million, respectively.