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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Elements |
Supplemental Cash Flow Information |
(Millions) |  | 2017 |  | 2016 |  | 2015 |
Cash income tax payments, net of refunds |  | $ | 1,604 |  | $ | 1,888 |  | $ | 2,331 |
Cash interest payments |  |  | 214 |  |  | 194 |  |  | 134 |

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