Commitments and Contingencies (Legal Contingencies Narrative) (Details) BRL in Millions	3 Months Ended		12 Months Ended				24 Months Ended
	Dec. 31, 2017 BRL	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2004 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
BEFIEX tax credit, additional amount available to recognize								$ 72,000,000
BEFIEX tax credits monetized			$ 42,000,000	$ 0	$ 0
BEFIEX tax credit								30,000,000
Outstanding BEFIEX tax assessment	BRL 1,900							565,000,000
Brazil Tax Matters
Loss Contingencies [Line Items]
IPI tax credits recognized							$ 26,000,000
Special government program settlement						$ 34,000,000
Brazil tax assessment	241							73,000,000
CFC tax
Loss Contingencies [Line Items]
CFC potential exposure	221							67,000,000
Loss contingency accrual								$ 0
Non-income and Income Tax Matters
Loss Contingencies [Line Items]
Proceeds from the sell of rights	BRL 90	$ 27,000,000
Face value of remaining credits		$ 260,000,000