Exhibit 12

COMPUTATIONS OF RATIO OF EARNINGS TO FIXED CHARGES AND RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

(in millions, except ratios)

For the year ended December 31,	2015		2014		2013			2012			2011
Earnings:
Income (loss) from continuing operations before income taxes	$	248	$	497	$	(1,816	)	$	324		$	1,063
Noncontrolling interests’ share of earnings of majority-owned subsidiaries without fixed charges		-		-		-			-			-
Equity loss (income)		6		18		(12	)		(99	)		(127	)
Fixed charges added to earnings		534		512		493			533			568
Distributed income of less than 50 percent-owned persons		152		86		89			101			100
Amortization of capitalized interest:
Consolidated		42		47		46			44			43
Proportionate share of 50 percent-owned persons		-		-		-			-			-
Total earnings	$	982	$	1,160	$	(1,200	)	$	903		$	1,647
Fixed Charges:
Interest expense:
Consolidated	$	498	$	473	$	453		$	490		$	524
Proportionate share of 50 percent-owned persons		-		-		-			-			-
		498		473		453			490			524
Amount representative of the interest factor in rents:
Consolidated		36		39		40			43			44
Proportionate share of 50 percent-owned persons		-		-		-			-			-
		36		39		40			43			44
Fixed charges added to earnings		534		512		493			533			568
Interest capitalized:
Consolidated		57		56		99			93			102
Proportionate share of 50 percent-owned persons		-		-		-			-			-
		57		56		99			93			102
Preferred stock dividend requirements of majority-owned subsidiaries		-		-		-			-			-
Total fixed charges	$	591	$	568	$	592		$	626		$	670
Pretax earnings required to pay preferred stock dividends*		107		32		3			3			3
Combined total fixed charges and preferred stock dividends		698		600		595			629			673
Ratio of earnings to fixed charges		1.7		2.0		(A	)		1.4			2.5
Ratio of earnings to combined fixed charges and preferred stock dividends		1.4		1.9		(B	)		1.4			2.4

* Based on a U.S. statutory tax rate of 35%

(A) For the year ended December 31, 2013, there was a deficiency of earnings to cover the fixed charges of $1,792.

(B) For the year ended December 31, 2013, there was a deficiency of earnings to cover the fixed charges of $1,795.