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Income Taxes Income Taxes (Summary of Valuation Allowance) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Valuation Allowance [Line Items]
Gross Assets (Liabilities), Net	$ 547
Deferred Tax Assets, Valuation Allowance	(542)	$ (538)
Deferred Tax Assets, Net	5	$ 48
UNITED STATES
Valuation Allowance [Line Items]
Gross Assets (Liabilities), Net	505
Deferred Tax Assets, Valuation Allowance	(503)
Deferred Tax Assets, Net	2
UNITED KINGDOM
Valuation Allowance [Line Items]
Gross Assets (Liabilities), Net	80
Deferred Tax Assets, Valuation Allowance	0
Deferred Tax Assets, Net	80
AUSTRALIA
Valuation Allowance [Line Items]
Gross Assets (Liabilities), Net	1
Deferred Tax Assets, Valuation Allowance	(1)
Deferred Tax Assets, Net	0
CANADA
Valuation Allowance [Line Items]
Gross Assets (Liabilities), Net	18
Deferred Tax Assets, Valuation Allowance	(14)
Deferred Tax Assets, Net	4
MEXICO
Valuation Allowance [Line Items]
Gross Assets (Liabilities), Net	(91)
Deferred Tax Assets, Valuation Allowance	(2)
Deferred Tax Assets, Net	(93)
Other [Member]
Valuation Allowance [Line Items]
Gross Assets (Liabilities), Net	34
Deferred Tax Assets, Valuation Allowance	(22)
Deferred Tax Assets, Net	$ 12

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- Definition

Gross Assets net of Gross Liabilities before valuation allowance

+ References

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, before jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

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