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Derivative Instruments (Narrative) (Details) (USD $)
 6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Maximum amount of future guarantee payments $ 102,500,000,000  
Derivatives ceded under reinsurance agreements and capital market transactions 178,000,000  
Fair value of derivative liabilities before counterparty netting 8,150,000,000 [1]  
Derivative liabilities, Total derivatives (8,150,000,000) [1]  
Derivative assets after counterparty netting 687,000,000 708,000,000
Derivative assets and derivative assets - VIE after counterparty netting and embedded reclasses 683,000,000 703,000,000
Derivative liabilities after counterparty netting   6,700,000,000
Derivative liabilities and derivative liabilities - VIE after counterparty netting and embedded reclasses 8,100,000,000  
Fair value of securities posted to derivative counterparties 386,000,000 452,000,000
Fair value of credit support annexes 3,000,000 4,000,000
Derivative Liabilities [Member]
    
Fair value of derivative liabilities before counterparty netting   6,798,000,000 [1]
Derivative liabilities, Total derivatives   $ (6,798,000,000) [1]
[1] In accordance with the accounting guidance for derivative instruments and hedging activities, the balance sheet location of the Company's embedded derivative instruments is determined by the location of the related host contract.