Investments (Tables)

12 Months Ended

Dec. 31, 2020

Investments

Summary of the estimated fair value of short-term investments classified as trading securities

		December 31,
(Millions of dollars)	2020		2019
Domestic equity securities	$	702	$	706
Domestic debt securities		496		460
Foreign equity securities		133		189
Foreign debt securities		68		48
Money market funds held in trading accounts		47		12
Other trading securities		19		19
Total trading short-term investments	$	1,465	$	1,434