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Income Taxes Operating Loss and Tax Credit Carryforwards, United States, By Expiration Dates (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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2013 through 2017 [Member] |
Operating Loss and Tax Credit Carry Forward [Line Items] |
United States federal income tax loss carryforwards | $ 0
United States federal deferred income tax assets for income tax loss carryforwards | 0
United States federal income tax credit carryforwards | 0
2018 through 2022 [Member] |
Operating Loss and Tax Credit Carry Forward [Line Items] |
United States federal income tax loss carryforwards | 0
United States federal deferred income tax assets for income tax loss carryforwards | 0
United States federal income tax credit carryforwards | 51
2023 through 2027 [Member] |
Operating Loss and Tax Credit Carry Forward [Line Items] |
United States federal income tax loss carryforwards | 15
United States federal deferred income tax assets for income tax loss carryforwards | 5
United States federal income tax credit carryforwards | 0
2028 through 2032 [Member] |
Operating Loss and Tax Credit Carry Forward [Line Items] |
United States federal income tax loss carryforwards | 2
United States federal deferred income tax assets for income tax loss carryforwards | 1
United States federal income tax credit carryforwards | 68
Not subject to expiration [Member] |
Operating Loss and Tax Credit Carry Forward [Line Items] |
United States federal income tax loss carryforwards | 0
United States federal deferred income tax assets for income tax loss carryforwards | 0
United States federal income tax credit carryforwards | 37
Valuation allowance [Member] |
Operating Loss and Tax Credit Carry Forward [Line Items] |
United States federal income tax loss carryforwards | 0
United States federal deferred income tax assets for income tax loss carryforwards | (5)
United States federal income tax credit carryforwards | $ (17)

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- Definition Deferred tax assets tax credit carryforwards domestic. + References No definition available. + Details
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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 + Details
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- Definition The sum of domestic, foreign and state and local operating loss carryforwards, 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 Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 48 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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