Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investments

Summary of the amortized cost and estimated fair value of short-term investments for both available-for-sale and trading securities

	December 31, 2016				December 31, 2015
	Amortized		Fair		Amortized		Fair
(Millions of dollars)	Cost		Value		Cost		Value
Money market funds	$	—	$	—	$	81	$	81
Total available-for-sale short-term investments		—		—		81		81
Domestic equity securities		444		482		475		466
Domestic debt securities held in mutual funds/ETFs/U.S. Treasuries		437		437		452		450
Foreign equity securities		198		199		120		120
High yield securities		114		115		108		104
Collateralized loan obligations		25		26		10		10
Money market funds held in trading accounts		13		13		22		22
Other trading securities		5		5		1		1
Total trading short-term investments		1,236		1,277		1,188		1,173
Total short-term investments	$	1,236	$	1,277	$	1,269	$	1,254