Investments (Unconsolidated Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Total Assets	$ 83,312	$ 80,983
Total Liabilities	85,855	83,490
Mortgage loans
Variable Interest Entity [Line Items]
Total Assets	93	100
Total Liabilities	118	125
Other limited partnership interests
Variable Interest Entity [Line Items]
Total Assets	6,224	6,250
Total Liabilities	8,382	8,402
FVO and trading securities
Variable Interest Entity [Line Items]
Total Assets	602	565
Total Liabilities	602	565
Mortgage loans, net
Variable Interest Entity [Line Items]
Total Assets	51	51
Total Liabilities	51	51
Other invested assets
Variable Interest Entity [Line Items]
Total Assets	1,696	1,720
Total Liabilities	2,056	2,050
Structured securities (RMBS, CMBS, and ABS) [Member]
Variable Interest Entity [Line Items]
Total Assets	70,903	68,427
Total Liabilities	70,903	68,427
U.S. corporate and foreign corporate securities
Variable Interest Entity [Line Items]
Total Assets	3,704	3,829
Total Liabilities	3,704	3,829
Non-redeemable preferred stock
Variable Interest Entity [Line Items]
Total Assets	39	41
Total Liabilities	$ 39	$ 41