Investments (Unconsolidated Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Total Assets	$ 79,786	$ 78,522
Total Liabilities	82,078	80,864
Real estate joint ventures [Member]
Variable Interest Entity [Line Items]
Total Assets	70	70
Total Liabilities	72	71
Other limited partnership interests [Member]
Variable Interest Entity [Line Items]
Total Assets	5,226	5,041
Total Liabilities	7,246	6,994
Trading securities [Member]
Variable Interest Entity [Line Items]
Total Assets	589	619
Total Liabilities	589	619
Mortgage loans, net [Member]
Variable Interest Entity [Line Items]
Total Assets	107	106
Total Liabilities	107	106
Other invested assets [Member]
Variable Interest Entity [Line Items]
Total Assets	1,567	1,509
Total Liabilities	1,837	1,897
Structured securities (RMBS, CMBS, and ABS) [Member]
Variable Interest Entity [Line Items]
Total Assets	67,848	67,176
Total Liabilities	67,848	67,176
U.S. corporate and foreign corporate securities [Member]
Variable Interest Entity [Line Items]
Total Assets	4,343	3,966
Total Liabilities	4,343	3,966
Non-redeemable preferred stock [Member]
Variable Interest Entity [Line Items]
Total Assets	36	35
Total Liabilities	$ 36	$ 35