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Income Taxes Operating Loss Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
UK |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 325 | $ 449
Capital Loss Carryforwards | 294 | 360
U.S. Federal |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 196 | 8
U.S. State |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 474 | 443
Other |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 350 | 245
Capital Loss Carryforwards | $ 218 | $ 206

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 + Details
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