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Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Consolidated Statements Of Comprehensive Income (Loss) [Abstract] |  |
Unrealized gains (losses), tax | $ 8 | $ 36
Reclassification adjustments for (gains) losses, tax | 39 | 11
Other-than-temporary impairment, tax | 4 | 3
Reclassification adjustments for other-than temporary impairments, tax | 15 | 2
Unrealized gains (losses) on derivative instruments, tax | 2 | 4
Reclassification adjustments for (gains) losses included in net income (loss), net of tax | 8 | 1
Foreign currency translation, tax | $ 0 | $ 2

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