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Investments (Credit Quality of Commercial Mortgage Loans) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans $ 39,110 $ 40,472
% of Total 100.00% 100.00%
Estimated Fair Value 41,071 43,082
% of Total 100.00% 100.00%
Less than 65% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 30,317 31,291
% of Total 77.50% 77.30%
Estimated Fair Value 32,188 33,730
% of Total 78.40% 78.30%
65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 6,449 5,882
% of Total 16.50% 14.60%
Estimated Fair Value 6,642 6,129
% of Total 16.20% 14.20%
76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,003 1,385
% of Total 2.60% 3.40%
Estimated Fair Value 1,001 1,436
% of Total 2.40% 3.30%
Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,341 1,914
% of Total 3.40% 4.70%
Estimated Fair Value 1,240 1,787
% of Total 3.00% 4.20%
Greater than 1.20x [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 36,393 36,919
Greater than 1.20x [Member] | Less than 65% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 29,341 29,839
Greater than 1.20x [Member] | 65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 5,689 5,057
Greater than 1.20x [Member] | 76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 322 938
Greater than 1.20x [Member] | Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,041 1,085
1.00x - 1.20x [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,607 2,085
1.00x - 1.20x [Member] | Less than 65% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 620 730
1.00x - 1.20x [Member] | 65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 541 672
1.00x - 1.20x [Member] | 76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 297 131
1.00x - 1.20x [Member] | Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 149 552
Less than 1.00x [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 1,110 1,468
Less than 1.00x [Member] | Less than 65% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 356 722
Less than 1.00x [Member] | 65% to 75% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 219 153
Less than 1.00x [Member] | 76% to 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans 384 316
Less than 1.00x [Member] | Greater than 80% [Member]
   
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:    
Commercial mortgage loans $ 151 $ 277