Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31, 2019, and December 31, 2018, is as follows:

Assets and Liabilities Measured at Fair Value on a Recurring Basis

(Millions of dollars)

	At March 31, 2019								At December 31, 2018
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Marketable Securities	$	56	$	56	$	—	$	—	$	53	$	53	$	—	$	—
Derivatives	22		2		20		—		283		185		98		—
Total Assets at Fair Value	$	78	$	58	$	20	$	—	$	336	$	238	$	98	$	—
Derivatives	63		58		5		—		12		—		12		—
Total Liabilities at Fair Value	$	63	$	58	$	5	$	—	$	12	$	—	$	12	$	—

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 March 31, 2019, is as follows:

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis

(Millions of dollars)

	At March 31, 2019
	Total		Level 1		Level 2		Level 3		Before-Tax Loss
Properties, plant and equipment, net (held and used)	$	48	$	—	$	—	$	48	$	7
Properties, plant and equipment, net (held for sale)	414		—		414		—		13
Investments and advances	—		—		—		—		3
Total Assets at Fair Value	$	462	$	—	$	414	$	48	$	23