Exhibit 12

COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES

(In millions, except ratios)

Year Ended December 31, | |||||||||||||||

2013 | 2014 | 2015 | 2016 | 2017 | |||||||||||

Earnings: | |||||||||||||||

Income before (benefit) provision for income taxes | $ | 605 | $ | 850 | $ | 963 | $ | 909 | $ | 1,048 | |||||

Add: | |||||||||||||||

Fixed charges, net of capitalized interest | 521 | 520 | 492 | 461 | 465 | ||||||||||

Total earnings available for fixed charges | 1,126 | 1,370 | 1,455 | 1,370 | 1,513 | ||||||||||

Fixed charges (1): | |||||||||||||||

Interest expense, net | 475 | 555 | 567 | 511 | 464 | ||||||||||

Add back interest income, which is netted in interest expense | 1 | 2 | 2 | 2 | 2 | ||||||||||

Add back refinance charges/losses on bond repurchases/retirement of subordinated convertible debentures, included in interest expense | (3 | ) | (80 | ) | (123 | ) | (101 | ) | (54 | ) | |||||

Interest expense—subordinated convertible debentures | 3 | — | — | — | — | ||||||||||

Capitalized interest | — | — | — | — | — | ||||||||||

Interest component of rent expense | 45 | 43 | 46 | 49 | 53 | ||||||||||

Fixed charges | $ | 521 | $ | 520 | $ | 492 | $ | 461 | $ | 465 | |||||

Ratio of earnings to fixed charges | 2.2x | 2.6x | 3.0x | 3.0x | 3.3x |

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(1) | Fixed charges consist of interest expense, which includes amortization of deferred finance charges, interest expense-subordinated debentures, capitalized interest and imputed interest on our lease obligations. The interest component of rent was determined based on an estimate of a reasonable interest factor at the inception of the leases. |