Investments (Details 45) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Variable Interest Entity [Line Items]
Total Assets	$ 87,484	$ 91,218
Total Liabilities	89,831	93,579
U.S. corporate securities [Member]
Variable Interest Entity [Line Items]
Total Assets	2,978	2,435
Total Liabilities	2,978	2,435
Foreign corporate securities [Member]
Variable Interest Entity [Line Items]
Total Assets	2,252	2,950
Total Liabilities	2,252	2,950
RMBS [Member]
Variable Interest Entity [Line Items]
Total Assets	41,893	44,733
Total Liabilities	41,893	44,733
CMBS [Member]
Variable Interest Entity [Line Items]
Total Assets	19,585	20,675
Total Liabilities	19,585	20,675
ABS [Member]
Variable Interest Entity [Line Items]
Total Assets	14,418	14,287
Total Liabilities	14,418	14,287
Real estate joint ventures [Member]
Variable Interest Entity [Line Items]
Total Assets	65	40
Total Liabilities	83	108
Other limited partnership interests [Member]
Variable Interest Entity [Line Items]
Total Assets	4,419	4,383
Total Liabilities	6,166	6,479
Trading securities [Member]
Variable Interest Entity [Line Items]
Total Assets	737	789
Total Liabilities	737	789
Mortgage loans, net [Member]
Variable Interest Entity [Line Items]
Total Assets	513	350
Total Liabilities	513	350
Other invested assets [Member]
Variable Interest Entity [Line Items]
Total Assets	624	576
Total Liabilities	$ 1,206	$ 773