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Financial Instruments and Risk Management (Tables) | 12 Months Ended
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Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [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:
| December 31, 2020 |  | December 31, 2019
Millions of dollars | Level 1 | Level 2 | Total fair value | Carrying value |  | Level 1 | Level 2 | Total fair value | Carrying value
Total debt | $ | 10,856 |  | $ | 700 |  | $ | 11,556 |  | $ | 9,827 |  |  | $ | 11,093 |  | $ | 868 |  | $ | 11,961 |  | $ | 10,327 |

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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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