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Income Taxes Deferred Tax Assets and Valuation Allowances (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ (13) |
Deferred Tax Assets, Operating Loss Carryforwards | 935 | $ 1,128
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 178 | 175
Deferred Tax Assets, Capital Loss Carryforwards |  | 4
Proceeds from Income Tax Refunds | 144 |
Capital Loss Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (4) |
Foreign Tax Authority [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (5) |
Annual Rate Reductions [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (24) |
Valuation Allowance, Operating Loss Carryforwards [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 18 |
Valuation Allowance, Tax Credit Carryforward [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 2 |
Valuation Allowance of Deferred Tax Assets [Member] |  |
Valuation Allowance [Line Items] |  |
Valuation Allowances and Reserves, Balance | 133 | $ 123
Deferred Income Tax Charge [Member] |  |
Valuation Allowance [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Increase (Decrease) | (143) |
Deferred Compensation, Share-based Payments [Member] |  |
Valuation Allowance [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards | $ 8 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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