Debt (Tables)

12 Months Ended

Dec. 31, 2020

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	2020		2019
5.0% senior notes due November 2045	$	2,000	$	2,000
3.8% senior notes due November 2025	1,000		2,000
4.85% senior notes due November 2035	1,000		1,000
7.45% senior notes due September 2039	1,000		1,000
2.92% senior notes due March 2030	1,000		—
4.75% senior notes due August 2043	900		900
6.7% senior notes due September 2038	800		800
3.5% senior notes due August 2023	600		1,100
4.5% senior notes due November 2041	500		500
3.25% senior notes due November 2021	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	20		28
Unamortized debt issuance costs and discounts	(82)		(90)
Total	9,827		10,327
Short-term borrowings and current maturities of long-term debt	(695)		(11)
Total long-term debt	$	9,132	$	10,316