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Investments (Details 33) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	$ 40,120	$ 37,818
% of Total	100.00%	100.00%
Estimated Fair Value	41,475	38,777
% of Total	100.00%	100.00%
Greater than 1.20x [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	36,454	32,873
Greater than 1.20x [Member] \| Less than 65% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	22,293	16,663
Greater than 1.20x [Member] \| 65% to 75% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	9,243	9,022
Greater than 1.20x [Member] \| 76% to 80% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	1,848	3,033
Greater than 1.20x [Member] \| Greater than 80% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	3,070	4,155
1.00x - 1.20x [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	2,037	3,007
1.00x - 1.20x [Member] \| Less than 65% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	438	125
1.00x - 1.20x [Member] \| 65% to 75% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	426	765
1.00x - 1.20x [Member] \| 76% to 80% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	251	304
1.00x - 1.20x [Member] \| Greater than 80% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	922	1,813
Less than 1.00x [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	1,629	1,938
Less than 1.00x [Member] \| Less than 65% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	565	483
Less than 1.00x [Member] \| 65% to 75% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	383	513
Less than 1.00x [Member] \| 76% to 80% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	156	135
Less than 1.00x [Member] \| Greater than 80% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	525	807
Less than 65% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	23,296	17,271
% of Total	58.10%	45.70%
Estimated Fair Value	24,587	18,183
% of Total	59.20%	46.90%
65% to 75% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	10,052	10,300
% of Total	25.00%	27.20%
Estimated Fair Value	10,404	10,685
% of Total	25.10%	27.60%
76% to 80% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	2,255	3,472
% of Total	5.60%	9.20%
Estimated Fair Value	2,301	3,535
% of Total	5.60%	9.10%
Greater than 80% [Member]
Commercial Mortgage Loans - by Credit Quality Indicators with Estimated Fair Value:
Commercial mortgage loans	4,517	6,775
% of Total	11.30%	17.90%
Estimated Fair Value	$ 4,183	$ 6,374
% of Total	10.10%	16.40%

Reflects the gross carrying amount of unpaid loans issued to businesses to provide financing on existing land or a building, which, pursuant to terms of the underlying debt instrument, are secured at a minimum but possibly exclusively by that real property. Mortgages represent permanent financing, and are issued to replace previously existing mortgages or pay off acquisition, development and construction loans, or to provide cash to the borrower.

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