XML 58 R39.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Financial Instruments and Risk Management (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
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, 2018 |  | December 31, 2017
Millions of dollars | Level 1 | Level 2 | Total fair value | Carrying value |  | Level 1 | Level 2 | Total fair value | Carrying value
Total debt | $ | 6,726 |  | $ | 4,150 |  | $ | 10,876 |  | $ | 10,457 |  |  | $ | 3,285 |  | $ | 9,172 |  | $ | 12,457 |  | $ | 10,942 |

X
- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfCarryingValuesAndEstimatedFairValuesOfDebtInstrumentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration