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Investments (Details 6) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans $ 40,472 $ 40,440
% of Total 100.00% 100.00%
Estimated Fair Value 43,082 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 31,291 25,995
% of Total 77.30% 64.30%
Estimated Fair Value 33,730 27,581
% of Total 78.30% 65.50%
65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 5,882 8,997
% of Total 14.60% 22.30%
Estimated Fair Value 6,129 9,387
% of Total 14.20% 22.30%
76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,385 1,474
% of Total 3.40% 3.60%
Estimated Fair Value 1,436 1,473
% of Total 3.30% 3.50%
Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,914 3,974
% of Total 4.70% 9.80%
Estimated Fair Value 1,787 3,664
% of Total 4.20% 8.70%
Greater than 1.20x [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 36,919 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 29,839 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 5,057 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 938 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 1,085 2,714
1.00x - 1.20x [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 2,085 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 730 448
1.00x - 1.20x [Member] | 65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 672 336
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 552 880
Less than 1.00x [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,468 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 722 564
Less than 1.00x [Member] | 65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 153 386
Less than 1.00x [Member] | 76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 316 226
Less than 1.00x [Member] | Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans $ 277 $ 380