Exhibit 12.1
| Nine Months Ended | Year Ended December 31, | |||||||||||||||||||||||
| 9/30/2017 | 2016 | 2015 | 2014 | 2013 | 2012 | |||||||||||||||||||
| Earnings available for fixed charges: |
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| Income (loss) before income taxes |
$ | 1,935 | $ | 3,892 | $ | 1,568 | $ | (111 | ) | $ | 506 | $ | 544 | |||||||||||
| Fixed charges, excluding capitalized interest |
$ | 638 | $ | 598 | $ | 547 | $ | 283 | $ | 197 | $ | 133 | ||||||||||||
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| Total earnings available for fixed charges |
$ | 2,573 | $ | 4,490 | $ | 2,115 | $ | 172 | $ | 703 | $ | 677 | ||||||||||||
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| Fixed charges: |
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| Interest and debt expense(1) |
$ | 529 | $ | 510 | $ | 484 | $ | 215 | $ | 143 | $ | 93 | ||||||||||||
| Assumed interest element included in rent expense |
$ | 128 | $ | 114 | $ | 88 | $ | 74 | $ | 57 | $ | 41 | ||||||||||||
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| Total fixed charges |
$ | 656 | $ | 624 | $ | 572 | $ | 289 | $ | 200 | $ | 134 | ||||||||||||
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| Ratio of earnings to fixed charges(2) |
3.92 | 7.19 | 3.70 | — | 3.52 | 5.07 | ||||||||||||||||||
| (1) | Includes amortization of debt-related expenses plus interest capitalized during the period. |
| (2) | In 2014, our earnings were insufficient to cover fixed charges by $117 million. |