Three Months Ended March 31, | Years Ended December 31, | ||||||||||||||||||||||
2018 | 2017 | 2016 | 2015 | 2014 | 2013 | ||||||||||||||||||
Earnings, as defined: | |||||||||||||||||||||||
Income Before Income Taxes | $ | 111 | $ | 418 | $ | 428 | $ | 374 | $ | 355 | $ | 360 | |||||||||||
Adjustment to reflect earnings from equity method investments on a cash basis | — | 1 | (1 | ) | (1 | ) | (1 | ) | (1 | ) | |||||||||||||
111 | 419 | 427 | 373 | 354 | 359 | ||||||||||||||||||
Total fixed charges as below | 26 | 100 | 100 | 86 | 80 | 73 | |||||||||||||||||
Total earnings | $ | 137 | $ | 519 | $ | 527 | $ | 459 | $ | 434 | $ | 432 | |||||||||||
Fixed charges, as defined: | |||||||||||||||||||||||
Interest charges (a) | $ | 25 | $ | 96 | $ | 96 | $ | 82 | $ | 77 | $ | 70 | |||||||||||
Estimated interest component of operating rentals | 1 | 4 | 4 | 4 | 3 | 3 | |||||||||||||||||
Total fixed charges | $ | 26 | $ | 100 | $ | 100 | $ | 86 | $ | 80 | $ | 73 | |||||||||||
Ratio of earnings to fixed charges | 5.3 | 5.2 | 5.3 | 5.3 | 5.4 | 5.9 |
(a) | Includes interest on long-term and short-term debt, as well as amortization of loss on reacquired debt and amortization of debt discount, expense and premium - net. |