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Derivatives (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Derivatives, Fair Value [Line Items]          
Derivative Asset, Fair Value, Gross Asset $ 1,703   $ 1,703   $ 2,370
Derivative Liability, Fair Value, Gross Liability 765   765   970
Cash collateral on derivative assets 18   18   0
Cash collateral on derivative liabilities 58   58   53
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged 0   0    
Derivative Instruments, Gain (Loss) [Line Items]          
Embedded derivatives (72) 65 181 179  
Derivative Instrument Detail [Abstract]          
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges 0 0 0 0  
Hedging exposure to variability in future cash flows for specific length of time     6 years   7 years
Accumulated Other Comprehensive Income (Loss) 148   148   243
Deferred net gains (losses) expected to be reclassified to earnings     4    
Maximum Amount of Future Payments under Credit Default Swaps 2,393   2,393   2,456
Estimated Fair Value of Credit Default Swaps 23   23   22
Nonperformance Risk [Member] | Direct and assumed guaranteed minimum benefit [Member]
         
Derivative Instruments, Gain (Loss) [Line Items]          
Embedded derivatives (38) 136 (127) (102)  
Nonperformance Risk [Member] | Ceded Guaranteed Minimum Benefit [Member]
         
Derivative Instruments, Gain (Loss) [Line Items]          
Embedded derivatives 41 (292) 159 39  
Over The Counter [Member]
         
Derivatives, Fair Value [Line Items]          
Excess securities collateral received on derivatives 23   23   0
Excess securities collateral provided on derivatives 12   12   0
Exchange Cleared [Member]
         
Derivatives, Fair Value [Line Items]          
Excess securities collateral provided on derivatives 1   1   0
Exchange Traded [Member]
         
Derivatives, Fair Value [Line Items]          
Excess securities collateral provided on derivatives 0   0   0
Accrued Liabilities [Member]
         
Derivatives, Fair Value [Line Items]          
Derivative Asset, Fair Value, Gross Asset 44   44   66
Derivative Liability, Fair Value, Gross Liability $ 29   $ 29   $ 46