Exhibit 12

Statement re Computation of Ratios of Earnings to Fixed Charges

	Six Months Ended
	June 30,				Year Ended December 31,
	2005		2004		2004		2003		2002		2001		2000
Earnings
Income before income taxes and cumulative effect of accounting changes	$	370	$	220	$	489	$	708	$	393	$	828	$	1,017
Add: Fixed charges	$	132	$	106	$	220	$	231	$	250	$	205	$	199
Less: Interest capitalized	$	18	$	20	$	39	$	33	$	17	$	21	$	28
Total	$	484	$	306	$	670	$	906	$	626	$	1,012	$	1,188
Fixed charges
Interest expense (net)	$	38	$	20	$	49	$	57	$	89	$	49	$	42
Add: Interest capitalized	$	19	$	20	$	39	$	33	$	17	$	21	$	28
Gross interest expense	$	57	$	40	$	88	$	90	$	106	$	70	$	70
Add: Interest factor of operating lease expense	$	75	$	66	$	132	$	141	$	144	$	135	$	129
Total	$	132	$	106	$	220	$	231	$	250	$	205	$	199
Ratio of earnings to fixed charges		3.67		2.89		3.05		3.92		2.50		4.94		5.97