Investments (Details 41) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Variable Interest Entity Primary Beneficiary
Total Assets	$ 10,965	$ 11,080
Total Liabilities	6,651	6,995
Consolidated securitization entities [Member]
Variable Interest Entity Primary Beneficiary
Total Assets	6,899	7,114
Total Liabilities	6,606	6,892
MRSC collateral financing arrangement [Member]
Variable Interest Entity Primary Beneficiary
Total Assets	3,381	3,333
Total Liabilities	0	0
Real estate joint ventures [Member]
Variable Interest Entity Primary Beneficiary
Total Assets	17	20
Total Liabilities	18	17
Other limited partnership interests [Member]
Variable Interest Entity Primary Beneficiary
Total Assets	354	319
Total Liabilities	26	85
Other invested assets [Member]
Variable Interest Entity Primary Beneficiary
Total Assets	102	108
Total Liabilities	1	1
Trading Securities [Member]
Variable Interest Entity Primary Beneficiary
Total Assets	212	186
Total Liabilities	$ 0	$ 0