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Fair Value Measurements (Textual 1) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Cash collateral liability	$ 160,000,000	$ 1,400,000,000
Investment sales receivable	3,100,000,000	4,000,000,000
Derivatives priced by valuation models	97.00%	98.00%
Behavior Risk Margin	302,000,000	419,000,000
Credit-linked notes [Member]
Debt Instrument [Line Items]
Outstanding principal balance of notes		$ 243,000,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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