Investments (Details 44) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	$ 90,198	$ 91,218
Maximum Exposure to Loss	92,370	93,579
U.S. corporate securities [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	2,610	2,435
Maximum Exposure to Loss	2,610	2,435
RMBS [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	43,550	44,733
Maximum Exposure to Loss	43,550	44,733
ABS [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	14,857	14,287
Maximum Exposure to Loss	14,857	14,287
CMBS [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	19,518	20,675
Maximum Exposure to Loss	19,518	20,675
Foreign corporate securities [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	3,350	2,950
Maximum Exposure to Loss	3,350	2,950
Real estate joint ventures [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	58	40
Maximum Exposure to Loss	104	108
Other limited partnership interests [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	4,381	4,383
Maximum Exposure to Loss	6,180	6,479
Other invested assets [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	582	576
Maximum Exposure to Loss	909	773
Trading Securities [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	784	789
Maximum Exposure to Loss	784	789
Non-redeemable preferred stock [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	33	0
Maximum Exposure to Loss	33	0
Mortgage loans, net [Member]
Variable Interest Entity, Not Primary Beneficiary, Holds Significant Variable Interest in VIE
Carrying Value	475	350
Maximum Exposure to Loss	$ 475	$ 350