Exhibit 12.1

Computation of Ratio of Earnings to Fixed Charges

Dollars in millions

	December 31, 2008		December 31, 2007		December 31, 2006		December 31, 2005		December 31, 2004
Earnings:
Earnings before income taxes	$	5,263	$	7,849	$	6,984	$	5,080	$	3,858
Add back:
Fixed charges		718		629		533		294		168
Total earnings available for fixed charges	$	5,981	$	8,478	$	7,517	$	5,374	$	4,026
Fixed Charges:
Interest, capitalized and expensed	$	639	$	562	$	470	$	248	$	132
Interest component of rental payments		79		67		63		46		36
Total fixed charges	$	718	$	629	$	533	$	294	$	168
Ratio of earnings to fixed charges		8.3		13.5		14.1		18.3		24.0

The ratio of earnings to fixed charges is computed by dividing total earnings available for fixed charges by the fixed charges. For purposes of computing this ratio, fixed charges consist of interest expense including amounts capitalized plus the interest factor in rental expense.