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Consolidated Statements Of Comprehensive Income (Loss) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]    
Net income (loss) $ 10 $ (1,274)
Unrealized gains (losses) on available-for-sale securities:    
Unrealized gains (losses) arising during the period, net of tax of $8 and $36 44 109
Less: Reclassification adjustments for (gains) losses included in net income (loss), net of tax of $39 and $11 73 (20)
Unrealized gains (losses) on available-for-sale securities, net 117 89
Other-than-temporary impairments on available-for-sale securities:    
Other-than-temporary impairments arising during the period, net of tax of $4 and $3 7 5
Less: Reclassification adjustments for other-than-temporary impairments included in net income (loss), net of tax of $15 and $2 26 4
Other-than-temporary impairments on available-for-sale securities, net 33 9
Unrealized gains (losses) on derivative instruments:    
Unrealized gains (losses) on derivative instruments arising during the period, net of tax of $2 and $4 (3) 2
Less: Reclassification adjustments for (gains) losses included in net income (loss), net of tax of $8 and $1 15 1
Unrealized gains (losses) on derivative instruments, net 12 3
Foreign currency translation, net of tax of $0 and $2 (12) (36)
Total other comprehensive income (loss) 150 65
Comprehensive income (loss) $ 160 $ (1,209)