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Investments (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Dec. 31, 2009
Available-for-sale Securities [Abstract]   
Amortized Cost$ 334,009$ 317,617 
Cost or Amortized Cost3,2273,621 
Gross Unrealized OTTI Loss678601859
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)353,927324,797 
Equity securities3,1183,602 
Fixed maturity securities [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost334,009317,617 
Gross Unrealized Gain25,16813,760 
Gross Unrealized Temporary Loss4,5725,979 
Gross Unrealized OTTI Loss678601 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)353,927324,797 
% of Total100.00%100.00% 
U.S. corporate securities [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost99,83288,905 
Gross Unrealized Gain8,2194,469 
Gross Unrealized Temporary Loss1,4761,602 
Gross Unrealized OTTI Loss00 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)106,57591,772 
% of Total30.10%28.30% 
Foreign corporate securities [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost61,01365,487 
Gross Unrealized Gain3,6163,326 
Gross Unrealized Temporary Loss1,108925 
Gross Unrealized OTTI Loss(1)0 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)63,52267,888 
% of Total18.00%20.90% 
Foreign government debt securities [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost50,24340,871 
Gross Unrealized Gain2,9361,733 
Gross Unrealized Temporary Loss220602 
Gross Unrealized OTTI Loss00 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)52,95942,002 
% of Total15.00%12.90% 
RMBS [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost40,79944,468 
Gross Unrealized Gain2,3831,652 
Gross Unrealized Temporary Loss698917 
Gross Unrealized OTTI Loss591470 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)41,89344,733 
% of Total11.80%13.80% 
U.S. Treasury and agency securities [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost36,15932,469 
Gross Unrealized Gain5,6861,394 
Gross Unrealized Temporary Loss11559 
Gross Unrealized OTTI Loss00 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)41,83433,304 
% of Total11.80%10.20% 
CMBS [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost19,25920,213 
Gross Unrealized Gain635740 
Gross Unrealized Temporary Loss307266 
Gross Unrealized OTTI Loss212 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)19,58520,675 
% of Total5.50%6.40% 
ABS [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost14,76514,722 
Gross Unrealized Gain322274 
Gross Unrealized Temporary Loss583590 
Gross Unrealized OTTI Loss86119 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)14,41814,287 
% of Total4.10%4.40% 
State and political subdivision securities [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost11,93910,476 
Gross Unrealized Gain1,371171 
Gross Unrealized Temporary Loss169518 
Gross Unrealized OTTI Loss00 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)13,14110,129 
% of Total3.70%3.10% 
Other fixed maturity securities [Member]
   
Available-for-sale Securities [Abstract]   
Amortized Cost06 
Gross Unrealized Gain01 
Gross Unrealized Temporary Loss00 
Gross Unrealized OTTI Loss00 
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)07 
% of Total0.00%0.00% 
Equity Securities [Member]
   
Available-for-sale Securities [Abstract]   
Cost or Amortized Cost3,2273,621 
Gross Unrealized Gain119222 
Gross Unrealized Temporary Loss228241 
Gross Unrealized OTTI Loss00 
Equity securities3,1183,602 
% of Total100.00%100.00% 
Common stock
   
Available-for-sale Securities [Abstract]   
Cost or Amortized Cost2,1732,059 
Gross Unrealized Gain80146 
Gross Unrealized Temporary Loss4212 
Gross Unrealized OTTI Loss00 
Equity securities2,2112,193 
% of Total70.90%60.90% 
Non-redeemable preferred stock [Member]
   
Available-for-sale Securities [Abstract]   
Cost or Amortized Cost1,0541,562 
Gross Unrealized Gain3976 
Gross Unrealized Temporary Loss186229 
Gross Unrealized OTTI Loss00 
Equity securities$ 907$ 1,409 
% of Total29.10%39.10%