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Investments (Details 33) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans $ 41,941 $ 40,440
% of Total 100.00% 100.00%
Estimated Fair Value 44,400 42,105
% of Total 100.00% 100.00%
Less than 65% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 31,028 25,995
% of Total 74.00% 64.30%
Estimated Fair Value 33,279 27,581
% of Total 75.00% 65.50%
65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 7,047 8,997
% of Total 16.80% 22.30%
Estimated Fair Value 7,367 9,387
% of Total 16.60% 22.30%
76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,236 1,474
% of Total 2.90% 3.60%
Estimated Fair Value 1,270 1,473
% of Total 2.80% 3.50%
Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 2,630 3,974
% of Total 6.30% 9.80%
Estimated Fair Value 2,484 3,664
% of Total 5.60% 8.70%
Greater than 1.20x [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 38,922 37,122
Greater than 1.20x [Member] | Less than 65% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 29,834 24,983
Greater than 1.20x [Member] | 65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 6,520 8,275
Greater than 1.20x [Member] | 76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 788 1,150
Greater than 1.20x [Member] | Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,780 2,714
1.00x - 1.20x [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,705 1,762
1.00x - 1.20x [Member] | Less than 65% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 734 448
1.00x - 1.20x [Member] | 65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 326 336
1.00x - 1.20x [Member] | 76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 131 98
1.00x - 1.20x [Member] | Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 514 880
Less than 1.00x [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,314 1,556
Less than 1.00x [Member] | Less than 65% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 460 564
Less than 1.00x [Member] | 65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 201 386
Less than 1.00x [Member] | 76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 317 226
Less than 1.00x [Member] | Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans $ 336 $ 380