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Fair Value Of Financial Instruments (Schedule Of Carrying Value And Fair Value Of Financial Instruments) (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Investments held as available-for-sale and held at fair value $ 10,946 $ 12,238    
Cash and cash equivalents 1,361 1,130 1,495 803
Variable Interest Entity, Primary Beneficiary [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
        
Total derivative assets 680 699    
Cash 735 764    
Investments held-to-maturity 3,934 4,039    
Fixed-maturity securities held as available-for-sale 280 339    
Fixed-maturity securities held as trading 4,835 5,241    
Loans receivable 2,320 2,183    
Loan repurchase commitments 905 835    
Long-term debt 360 360    
Derivative liabilities 2,160 2,104    
Variable interest entity notes 10,449 10,590    
Carrying (Reported) Amount, Fair Value Disclosure [Member]
        
Investments held as available-for-sale and held at fair value 10,691 11,739    
Other investments 160 188    
Cash and cash equivalents 626 366    
Receivable for investments sold 76 8    
Insured derivatives, Assets 0 0    
Non-insured derivatives, Assets 3 4    
Total derivative assets 3 4    
Investment agreements 1,632 2,005    
Medium-term notes 1,763 1,740    
Securities sold under agreements to repurchase 387 471    
Short-term debt   65    
Long-term debt 1,843 1,851    
Payable for settlement of derivatives and investments purchased 235 2    
Derivative liabilities 5,934 4,617    
Warrants 23 58    
Insured derivatives, Liabilities 5,676 4,375    
Non-insured derivatives, Liabilities 258 242    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Financial Guarantees [Member]
        
Gross 4,666 5,275    
Ceded 114 112    
Variable Interest Entity, Primary Beneficiary [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
        
Total derivative assets 680 699    
Cash 735 764    
Investments held-to-maturity 3,703 3,760    
Fixed-maturity securities held as available-for-sale 280 339    
Fixed-maturity securities held as trading 4,835 5,241    
Loans receivable 2,320 2,183    
Loan repurchase commitments 905 835    
Long-term debt 338 340    
Derivative liabilities 2,160 2,104    
Variable interest entity notes 10,183 10,285    
Estimate of Fair Value, Fair Value Disclosure [Member]
        
Investments held as available-for-sale and held at fair value 10,691 11,739    
Other investments 160 188    
Cash and cash equivalents 626 366    
Receivable for investments sold 76 8    
Insured derivatives, Assets 0 0    
Non-insured derivatives, Assets 3 4    
Total derivative assets 3 4    
Investment agreements 1,799 2,172    
Medium-term notes 1,258 766    
Securities sold under agreements to repurchase 385 454    
Short-term debt   65    
Long-term debt 1,167 1,155    
Payable for settlement of derivatives and investments purchased 235 2    
Derivative liabilities 5,934 4,617    
Warrants 23 58    
Insured derivatives, Liabilities 5,676 4,375    
Non-insured derivatives, Liabilities 258 242    
Estimate of Fair Value, Fair Value Disclosure [Member] | Financial Guarantees [Member]
        
Gross 4,402 3,906    
Ceded 120 48    
Variable Interest Entity, Primary Beneficiary [Member]
        
Total derivative assets 680 699    
Cash 735 764    
Investments held-to-maturity 3,934 4,039    
Fixed-maturity securities held as available-for-sale 280 339    
Fixed-maturity securities held as trading 4,835 5,241    
Loans receivable 2,320 2,183    
Loan repurchase commitments 905 835    
Derivative liabilities 2,160 2,104    
Variable interest entity notes $ 10,449 $ 10,590