Investments (Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Total Assets	$ 79,348	$ 80,983
Total Liabilities	81,744	83,490
Other limited partnership interests
Variable Interest Entity [Line Items]
Total Assets	6,208	6,250
Total Liabilities	8,156	8,402
Other invested assets
Variable Interest Entity [Line Items]
Total Assets	1,593	1,720
Total Liabilities	2,017	2,050
FVO and trading securities
Variable Interest Entity [Line Items]
Total Assets	628	565
Total Liabilities	628	565
Real estate joint ventures
Variable Interest Entity [Line Items]
Total Assets	76	100
Total Liabilities	100	125
Mortgage loans
Variable Interest Entity [Line Items]
Total Assets	33	51
Total Liabilities	33	51
Structured securities (RMBS, CMBS, and ABS) [Member]
Variable Interest Entity [Line Items]
Total Assets	67,350	68,427
Total Liabilities	67,350	68,427
U.S. corporate and foreign corporate securities
Variable Interest Entity [Line Items]
Total Assets	3,420	3,829
Total Liabilities	3,420	3,829
Non-redeemable preferred stock
Variable Interest Entity [Line Items]
Total Assets	40	41
Total Liabilities	$ 40	$ 41