Investments (Tables)

12 Months Ended

Dec. 31, 2023

Investments

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

		December 31,
(Millions of dollars)	2023		2022
Domestic equity securities	$	143	$	433
Foreign equity securities		96		169
Domestic debt securities		593		399
Foreign debt securities		120		66
Money market funds held in trading accounts		17		12
Other trading securities		4		7
Total trading short-term investments	$	973	$	1,086