December 31
Millions of dollars	2007	2006
3.125% convertible senior notes due July 2023	$   1,200	$   1,200
5.5% senior notes due October 2010	749	749
7.6% debentures due August 2096	294	294
8.75% debentures due February 2021	185	185
Medium-term notes due 2008 through 2027	299	299
Other	59	82
Total long-term debt	2,786	2,809
Less current portion	159	26
Noncurrent portion of long-term debt	$   2,627	$   2,783