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Investments (Details 9) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost$ 334,009$ 317,617
Estimated fair value170,097159,660
% of Total100.00%100.00%
CMBS [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost19,25920,213
Estimated fair value19,58520,675
% of Total100.00%100.00%
CMBS [Member] | Vintage Year, 2003 & Prior [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost6,2988,023
Estimated fair value6,3928,244
CMBS [Member] | Vintage Year, 2003 & Prior [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost5,9367,411
Estimated fair value6,0407,640
CMBS [Member] | Vintage Year, 2003 & Prior [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost178282
Estimated fair value176282
CMBS [Member] | Vintage Year, 2003 & Prior [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost105228
Estimated fair value101227
CMBS [Member] | Vintage Year, 2003 & Prior [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost5874
Estimated fair value5571
CMBS [Member] | Vintage Year, 2003 & Prior [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost2128
Estimated fair value2024
CMBS [Member] | Vintage Year, 2005 [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost4,0464,057
Estimated fair value4,2074,217
CMBS [Member] | Vintage Year, 2005 [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost3,1173,113
Estimated fair value3,3163,292
CMBS [Member] | Vintage Year, 2005 [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost400322
Estimated fair value401324
CMBS [Member] | Vintage Year, 2005 [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost324286
Estimated fair value311280
CMBS [Member] | Vintage Year, 2005 [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost168263
Estimated fair value153255
CMBS [Member] | Vintage Year, 2005 [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost3773
Estimated fair value2666
CMBS [Member] | Vintage Year, 2004 [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost4,4044,254
Estimated fair value4,5194,345
CMBS [Member] | Vintage Year, 2004 [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost3,6983,489
Estimated fair value3,8233,620
CMBS [Member] | Vintage Year, 2004 [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost447277
Estimated fair value455273
CMBS [Member] | Vintage Year, 2004 [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost134216
Estimated fair value126209
CMBS [Member] | Vintage Year, 2004 [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost92181
Estimated fair value89175
CMBS [Member] | Vintage Year, 2004 [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost3391
Estimated fair value2668
CMBS [Member] | Vintage Year, 2006 [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost2,3572,341
Estimated fair value2,3892,427
CMBS [Member] | Vintage Year, 2006 [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost1,7331,463
Estimated fair value1,8131,545
CMBS [Member] | Vintage Year, 2006 [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost229159
Estimated fair value217160
CMBS [Member] | Vintage Year, 2006 [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost91168
Estimated fair value87168
CMBS [Member] | Vintage Year, 2006 [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost147385
Estimated fair value135398
CMBS [Member] | Vintage Year, 2006 [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost157166
Estimated fair value137156
CMBS [Member] | Vintage Year, 2007 [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost1,4671,521
Estimated fair value1,3681,425
CMBS [Member] | Vintage Year, 2007 [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost700840
Estimated fair value714791
CMBS [Member] | Vintage Year, 2007 [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost439344
Estimated fair value362298
CMBS [Member] | Vintage Year, 2007 [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost16396
Estimated fair value13795
CMBS [Member] | Vintage Year, 2007 [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost39119
Estimated fair value38108
CMBS [Member] | Vintage Year, 2007 [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost126122
Estimated fair value117133
CMBS [Member] | Vintage Year, 2008 [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost242
Estimated fair value292
CMBS [Member] | Vintage Year, 2008 [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost02
Estimated fair value02
CMBS [Member] | Vintage Year, 2008 [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2008 [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2008 [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2008 [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost240
Estimated fair value290
CMBS [Member] | Vintage Year, 2009 [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost23
Estimated fair value23
CMBS [Member] | Vintage Year, 2009 [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost23
Estimated fair value23
CMBS [Member] | Vintage Year, 2009 [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2009 [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2009 [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2009 [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2010 [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost6212
Estimated fair value6912
CMBS [Member] | Vintage Year, 2010 [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost28
Estimated fair value38
CMBS [Member] | Vintage Year, 2010 [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2010 [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost604
Estimated fair value664
CMBS [Member] | Vintage Year, 2010 [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2010 [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost00
Estimated fair value00
CMBS [Member] | Vintage Year, 2011 [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost599 
Estimated fair value610 
CMBS [Member] | Vintage Year, 2011 [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost505 
Estimated fair value513 
CMBS [Member] | Vintage Year, 2011 [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost0 
Estimated fair value0 
CMBS [Member] | Vintage Year, 2011 [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost94 
Estimated fair value97 
CMBS [Member] | Vintage Year, 2011 [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost0 
Estimated fair value0 
CMBS [Member] | Vintage Year, 2011 [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost0 
Estimated fair value0 
CMBS [Member] | Aaa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost15,69316,329
Estimated fair value16,22416,901
% of Total82.80%81.70%
CMBS [Member] | Aa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost1,6931,384
Estimated fair value1,6111,337
% of Total8.30%6.40%
CMBS [Member] | A [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost971998
Estimated fair value925983
% of Total4.70%4.80%
CMBS [Member] | Baa [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost5041,022
Estimated fair value4701,007
% of Total2.40%4.90%
CMBS [Member] | Below Investment Grade [Member]
  
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]  
Amortized Cost398480
Estimated fair value$ 355$ 447
% of Total1.80%2.20%