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Income Taxes Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect, By Expiration Dates (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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2014 through 2018 [Member] |
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items] |
United States state and local assets for income tax loss carryforwards - net of federal tax effect | $ 4
United States and local income tax credit carryforward - net of federal tax effect | 11
2019 through 2023 [Member] |
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items] |
United States state and local assets for income tax loss carryforwards - net of federal tax effect | 15
United States and local income tax credit carryforward - net of federal tax effect | 9
2024 through 2028 [Member] |
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items] |
United States state and local assets for income tax loss carryforwards - net of federal tax effect | 13
United States and local income tax credit carryforward - net of federal tax effect | 7
2029 through 2033 [Member] |
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items] |
United States state and local assets for income tax loss carryforwards - net of federal tax effect | 5
United States and local income tax credit carryforward - net of federal tax effect | 3
Not subject to expiration [Member] |
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items] |
United States state and local assets for income tax loss carryforwards - net of federal tax effect | 0
United States and local income tax credit carryforward - net of federal tax effect | 6
Valuation allowance [Member] |
Income Tax Loss and Tax Credit Carryforwards, State and Local, Net of Federal Tax Effect [Line Items] |
United States state and local assets for income tax loss carryforwards - net of federal tax effect | (15)
United States and local income tax credit carryforward - net of federal tax effect | $ (16)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating 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=6907707&loc=d3e32621-109319 Reference 2: 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=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition The amount of the tax credit 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=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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