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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and Liabilities Measured at Fair Value on a Recurring Basis



	At December 31, 2017												At December 31, 2016
	Total			Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3
Marketable securities	$	9		$	9		$	—		$	—		$	13		$	13		$	—		$	—
Derivatives	22			—			22			—			32			15			17			—
Total assets at fair value	$	31		$	9		$	22		$	—		$	45		$	28		$	17		$	—
Derivatives	124			78			46			—			109			78			31			—
Total liabilities at fair value	$	124		$	78		$	46		$	—		$	109		$	78		$	31		$	—

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

Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis



	At December 31															At December 31
													Before-Tax Loss															Before-Tax Loss
	Total			Level 1			Level 2			Level 3			Year 2017			Total			Level 1			Level 2			Level 3			Year 2016
Properties, plant and equipment, net (held and used)	$	603		$	—		$	—		$	603		$	658		$	582		$	—		$	15		$	567		$	2,507
Properties, plant and equipment, net (held for sale)	1,378			—			1,378			—			363			891			—			888			3			679
Investments and advances	28			—			1			27			26			26			—			20			6			234
Total nonrecurring assets at fair value	$	2,009		$	—		$	1,379		$	630		$	1,047		$	1,499		$	—		$	923		$	576		$	3,420