Exhibit 12

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(in millions, except ratios)

For the year ended December 31,	2011			2010			2009			2008			2007
Earnings:
Income (loss) from continuing operations before income taxes	$	1,063		$	548		$	(1,498	)	$	792		$	4,802
Noncontrolling interests’ share of earnings of majority-owned subsidiaries without fixed charges		-			-			-			-			-
Equity income		(127	)		(54	)		(17	)		(130	)		(168	)
Fixed charges added to earnings		568			532			508			452			454
Distributed income of less than 50 percent-owned persons		100			33			56			81			51
Amortization of capitalized interest:
Consolidated		43			39			30			26			21
Proportionate share of 50 percent-owned persons		-			-			-			-			-
Total earnings	$	1,647		$	1,098		$	(921	)	$	1,221		$	5,160
Fixed Charges:
Interest expense:
Consolidated	$	524		$	494		$	470		$	407		$	401
Proportionate share of 50 percent-owned persons		-			-			-			1			3
		524			494			470			408			404
Amount representative of the interest factor in rents:
Consolidated		44			38			38			43			48
Proportionate share of 50 percent-owned persons		-			-			-			1			2
		44			38			38			44			50
Fixed charges added to earnings		568			532			508			452			454
Interest capitalized:
Consolidated		102			96			165			167			199
Proportionate share of 50 percent-owned persons		-			-			-			2			4
		102			96			165			169			203
Preferred stock dividend requirements of majority-owned subsidiaries		-			-			-			-			-
Total fixed charges	$	670		$	628		$	673		$	621		$	657
Ratio of earnings to fixed charges		2.5			1.7			(A	)		2.0			7.9

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