Income Taxes (Narrative - Carryforwards and Valuation Adjustment) (Details) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Operating Loss Carryforwards [Line Items] | |||||||||||
Income tax expense (benefit) from continuing operations | $ (887,000,000) | $ 46,000,000 | $ (16,000,000) | $ 1,000,000 | $ 14,000,000 | $ 10,000,000 | $ 8,000,000 | $ 10,000,000 | $ (856,000,000) | $ 42,000,000 | $ 97,000,000 |
Deferred Tax Assets, Valuation Allowance | 1,653,000,000 | 2,274,000,000 | 1,653,000,000 | 2,274,000,000 | |||||||
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 1,600,000,000 | 1,600,000,000 | |||||||||
Domestic Tax Authority [Member]
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Operating Loss Carryforwards [Line Items] | |||||||||||
Deferred Tax Assets, Valuation Allowance | 1,600,000,000 | 1,600,000,000 | |||||||||
Operating Loss Carryforwards | 668,000,000 | 668,000,000 | |||||||||
Deferred Tax Assets, Capital Loss Carryforwards | 2,200,000,000 | 2,200,000,000 | |||||||||
State and Local Jurisdiction [Member]
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Operating Loss Carryforwards [Line Items] | |||||||||||
Operating Loss Carryforwards | 1,700,000,000 | 1,700,000,000 | |||||||||
Deferred Tax Assets, Capital Loss Carryforwards | $ 3,100,000,000 | $ 3,100,000,000 |