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Fair value by balance sheet grouping table (Tables) | 3 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The carrying amount and fair value of our total debt, including short-term borrowings and current maturities of long-term debt, is as follows:
| March 31, 2019 |  | December 31, 2018
Millions of dollars | Level 1 | Level 2 | Total fair value | Carrying value |  | Level 1 | Level 2 | Total fair value | Carrying value
Total debt | $ | 8,769 |  | $ | 2,621 |  | $ | 11,390 |  | $ | 10,332 |  |  | $ | 6,726 |  | $ | 4,041 |  | $ | 10,767 |  | $ | 10,348 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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