Exhibit 12

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

FOR THE YEAR ENDED DECEMBER 31,

(in millions, except ratios)

	2010			2009			2008			2007			2006
Earnings:
Income (loss) from continuing operations before income taxes	$	548		$	(1,498	)	$	792		$	4,802		$	3,515
Noncontrolling interests’ share of earnings of majority-owned subsidiaries without fixed charges		—			—			—			—			—
Equity income		(54	)		(17	)		(130	)		(168	)		(127	)
Fixed charges added to earnings		532			508			452			454			436
Distributed income of less than 50 percent-owned persons		33			56			81			51			37
Amortization of capitalized interest:
Consolidated		39			30			26			21			21
Proportionate share of 50 percent-owned persons		—			—			—			—			—
Total earnings	$	1,098		$	(921	)	$	1,221		$	5,160		$	3,882
Fixed Charges:
Interest expense:
Consolidated	$	494		$	470		$	407		$	401		$	384
Proportionate share of 50 percent-owned persons		—			—			1			3			5
		494			470			408			404			389
Amount representative of the interest factor in rents:
Consolidated		38			38			43			48			45
Proportionate share of 50 percent-owned persons		—			—			1			2			2
		38			38			44			50			47
Fixed charges added to earnings		532			508			452			454			436
Interest capitalized:
Consolidated		96			165			167			199			128
Proportionate share of 50 percent-owned persons		—			—			2			4			2
		96			165			169			203			130
Preferred stock dividend requirements of majority-owned subsidiaries		—			—			—			—			—
Total fixed charges	$	628		$	673		$	621		$	657		$	566
Ratio of earnings to fixed charges		1.7			(A	)		2.0			7.9			6.9

(A) For the year ended December 31, 2009, there was a deficiency of earnings to cover the fixed charges of $1,594.