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Investments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Mar. 31, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Net unrealized gains (losses) related to changes in fair value of trading securities still held included in net investment income           
Net unrealized gains (losses) related to changes in the fair value of securities for which the fair value option has been elected        1  
Payments of debt extinguishment costs       9  
Reduction of net unrealized gains on investments included in AOCI due to shadow adjustment 940   940   723
Fair value 41,657   41,657   40,241
Gross unrealized losses 314   314   541
Pretax Net Unrealized Gains On Available For Sale Securities Reclassified Out of AOCI Into Earnings 15 20 47 41  
Commitments to purchase various privately placed debt securities 145   145    
Commitments to sell various privately placed debt securities 124   124    
Obligations on unfunded bank loan participations 12   12    
Mortgage loan commitments 20   20    
Asset-backed [Member]
         
Fair value 8,525   8,525   8,084
Number Of Different Asset Backed Securities Comprising Total Fair Value Of Asset backed Holdings 2,034   2,034    
Gross unrealized losses 169   169   246
Mortgage backed securities, issued by U.S. Government sponsored enterprises [Member]
         
Gross unrealized losses 63   63    
Non-agency structured residential mortgage backed securities [Member]
         
Gross unrealized losses 78   78    
Number of securities with at least one trade lot in a gross unrealized loss position 94   94    
Severity of gross unrealized loss as percentage of amortized cost 9.00%   9.00%    
Commercial mortgage-backed [Member]
         
Fair value 1,569   1,569   1,354
Gross unrealized losses 27   27   59
Number of securities with at least one trade lot in a gross unrealized loss position 44   44    
Severity of gross unrealized loss as percentage of amortized cost 8.00%   8.00%    
Investment commitment [Member]
         
Future capital call commitments $ 141   $ 141