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Fair Value of Financial Instruments Fair value by balance sheet grouping table (Tables)

9 Months Ended

Sep. 30, 2018

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:

	September 30, 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	$	8,119		$	3,284		$	11,403		$	10,459			$	3,285		$	9,172		$	12,457		$	10,942

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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.

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