Exhibit 12.1

Computation of Ratio of Earnings to Fixed Charges

	Year Ended December 31,
(Dollars in millions except ratios)	2017			2016			2015			2014			2013
Income (Loss) from continuing operations before income taxes (a)	$	(2,653	)	$	(2,868	)	$	(2,099	)	$	(261	)	$	(207	)
Fixed charges:
Interest expense (b)	595			506			474			507			524
Capitalized Interest	1			1			1			5			4
Interest factor portion of rentals (c)	52			86			114			132			131
Total fixed charges	648			593			589			644			659
Less: Capitalized Interest	(1		)	(1		)	(1		)	(5		)	(4		)
Earnings (loss) before income taxes and fixed charges	$	(2,006	)	$	(2,276	)	$	(1,511	)	$	378		$	448
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 years ended December 31, 2017, 2016, 2015, 2014 and 2013, earnings, as defined, before fixed charges were inadequate to cover fixed charges by $2.7 billion, $2.9 billion, $2.1 billion, $266 million and $211 million, respectively.