Investments (Tables)

12 Months Ended

Dec. 31, 2018

Investments

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

		December 31,
	2018		2017
	Fair		Fair
(Millions of dollars)	Value		Value
Domestic equity securities	$	632	$	752
Domestic debt securities		268		439
Foreign equity securities		218		319
Money market funds held in trading accounts		146		10
Collateralized loan obligations		28		29
High yield securities		19		21
Foreign debt securities		16		—
Term deposits		9		—
Other trading securities		—		6
Total trading short-term investments	$	1,336	$	1,576