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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 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 + Details
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