Investments and Derivative Instruments (Details 11) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Variable Interest Entities Primary Beneficiary
Total Liabilities	$ 439		$ 471
Consolidated VIEs [Member]
Variable Interest Entities Primary Beneficiary
Total Assets	623		498
Total Liabilities	439	[1]	471	[1]
Maximum Exposure to Loss	180	[2]	36	[2]
CDOs [Member] | Consolidated VIEs [Member]
Variable Interest Entities Primary Beneficiary
Total Assets	459	[3]	491	[3]
Total Liabilities	438	[1],[3]	471	[1],[3]
Maximum Exposure to Loss	17	[2],[3]	29	[2],[3]
Investment Fund [Member] | Consolidated VIEs [Member]
Variable Interest Entities Primary Beneficiary
Total Assets	157	[4]	0	[4]
Total Liabilities	0	[1],[4]	0	[1],[4]
Maximum Exposure to Loss	157	[2],[4]	0	[2],[4]
Limited partnerships [Member] | Consolidated VIEs [Member]
Variable Interest Entities Primary Beneficiary
Total Assets	7		7
Total Liabilities	1	[1]	0	[1]
Maximum Exposure to Loss	$ 6	[2]	$ 7	[2]

[1] Included in other liabilities in the Company’s Condensed Consolidated Balance Sheets.

[2] The maximum exposure to loss represents the maximum loss amount that the Company could recognize as a reduction in net investment income or as a realized capital loss and is the cost basis of the Company’s investment.

[3] Total assets included in fixed maturities, AFS, and fixed maturities, FVO, in the Company’s Condensed Consolidated Balance Sheets.

[4] Total assets included in fixed maturities, AFS, and short-term investments in the Company’s Condensed Consolidated Balance Sheets.