Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Schedule of debt

Our total debt, including short-term borrowings and current maturities of long-term debt, consisted of the following:

	December 31
Millions of dollars	2019			2018
5.0% senior notes due November 2045	$	2,000		$	2,000
3.8% senior notes due November 2025	2,000			2,000
3.5% senior notes due August 2023	1,100			1,100
4.85% senior notes due November 2035	1,000			1,000
7.45% senior notes due September 2039	1,000			1,000
4.75% senior notes due August 2043	900			900
6.7% senior notes due September 2038	800			800
3.25% senior notes due November 2021	500			500
4.5% senior notes due November 2041	500			500
7.6% senior debentures due August 2096	300			300
8.75% senior debentures due February 2021	185			185
6.75% notes due February 2027	104			104
Other	28			47
Unamortized debt issuance costs and discounts	(90		)	(92		)
Total	10,327			10,344
Short-term borrowings and current maturities of long-term debt	(11		)	(32		)
Total long-term debt	$	10,316		$	10,312