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



	December 31
Millions of dollars	2017			2016
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
2.0% senior notes due August 2018	400			400
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
6.15% senior notes due September 2019	—			1,000
5.9% senior notes due September 2018	—			400
7.53% notes due May 2017	—			45
Other	251			260
Unamortized debt issuance costs and discounts	(98		)	(110		)
Total	10,942			12,384
Short-term borrowings and current maturities of long-term debt	(512		)	(170		)
Total long-term debt	$	10,430		$	12,214