Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The fair value hierarchy for assets and liabilities measured at fair value on a recurring basis at September 30, 2018, and December 31, 2017, is as follows:

Assets and Liabilities Measured at Fair Value on a Recurring Basis

(Millions of dollars)

	At September 30, 2018								At December 31, 2017
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Marketable Securities	$	60	$	60	$	—	$	—	$	9	$	9	$	—	$	—
Derivatives	16		1		15		—		22		—		22		—
Total Assets at Fair Value	$	76	$	61	$	15	$	—	$	31	$	9	$	22	$	—
Derivatives	84		52		32		—		124		78		46		—
Total Liabilities at Fair Value	$	84	$	52	$	32	$	—	$	124	$	78	$	46	$	—

Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis

The fair value hierarchy for assets and liabilities measured at fair value on a nonrecurring basis at September 30, 2018, is as follows:

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

(Millions of dollars)

	At September 30, 2018
									Before-Tax Loss
	Total		Level 1		Level 2		Level 3		Three Months Ended		Nine Months Ended
Properties, plant and equipment, net (held and used)	$	—	$	—	$	—	$	—	$	—	$	—
Properties, plant and equipment, net (held for sale)	212		—		—		212		290		586
Investments and advances	56		—		—		56		43		44
Total Assets at Fair Value	$	268	$	—	$	—	$	268	$	333	$	630