Income Taxes (Reconciliation of Statutory to Effective Income Tax Rate) (Details) $ in Millions, MXN in Billions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 31, 2016 USD ($)	Aug. 31, 2016 MXN
Income Tax Contingency [Line Items]
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
Increase (decrease) in rate due to:
Non-U.S. income tax differential	1.20%	(2.10%)	(0.90%)
U.S. state and local income taxes, net of related U.S. federal income taxes	0.10%	(1.30%)	(2.00%)
U.S. federal credits	0.30%	(2.20%)	0.00%
Permanent adjustments	0.60%	3.80%	7.50%
Foreign withholding taxes	(2.00%)	5.70%	4.70%
Valuation allowance	(4.40%)	11.10%	(174.80%)
Unrecognized tax benefits	(3.90%)	10.00%	(0.30%)
Impact of foreign exchange	(1.60%)	3.40%	(19.80%)
Tax effect of intercompany capitalization	0.00%	0.00%	11.70%
Impact of legislative change	(8.70%)	0.00%	0.00%
Goodwill impairment	(36.00%)	0.00%	0.00%
Other	(1.00%)	0.30%	3.00%
Consolidated effective income tax rate	(20.40%)	63.70%	(135.90%)
Temporary Difference, Undistributed Earnings of Foreign Subsidiaries	11.4	27.7
Mexico \| Tax Year 2010 [Member]
Income Tax Contingency [Line Items]
Administrative Assessment Amount from Tax Administration Service				$ 157	MXN 3

Assessment amount from tax administration service.

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Effective Income Tax Rate Reconciliation, Foreign Withholding Taxes

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Effective Income Tax Rate Reconciliation Unrecognized Tax Benefits

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Impact of foreign exchange on effective tax rate

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Tax impact of Intercompany capitalization as a percent on the effective tax rate

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Description of the temporary difference for which a deferred tax liability has not been recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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