Investments (Tables)

12 Months Ended

Dec. 31, 2021

Investments

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

		December 31,
(Millions of dollars)	2021		2020
Domestic debt securities	$	542	$	496
Domestic equity securities		472		702
Foreign equity securities		193		133
Foreign debt securities		133		68
Money market funds held in trading accounts		59		47
Other trading securities		17		19
Total trading short-term investments	$	1,416	$	1,465