Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments

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

	March 31,		December 31,
(Millions of dollars)	2018		2017
Domestic equity securities	$	744	$	752
Foreign equity securities		320		319
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries		135		439
Collateralized loan obligations		28		29
High yield securities		21		21
Money market funds held in trading accounts		8		10
Other trading securities		8		6
Total trading short-term investments	$	1,264	$	1,576