EXHIBIT 12.1

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

March 31, | March 31, | |||||||

(dollars in millions) | 2013 | 2012 | ||||||

Earnings before income taxes | $ | 1,961 | $ | 2,169 | ||||

Fixed charges | 209 | 170 | ||||||

Total earnings available for fixed charges | $ | 2,170 | $ | 2,339 | ||||

Fixed Charges: | ||||||||

Interest expense | $ | 178 | $ | 148 | ||||

Interest component of rental payments | 31 | 22 | ||||||

Total fixed charges | $ | 209 | $ | 170 | ||||

Ratio of earnings to fixed charges | 10.4 | 13.8 |

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 plus the interest factor in rental expense.