Investments (Unconsolidated Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Total Assets	$ 81,738	$ 78,522
Total Liabilities	83,672	80,864
Real estate joint ventures [Member]
Variable Interest Entity [Line Items]
Total Assets	65	70
Total Liabilities	67	71
Other limited partnership interests [Member]
Variable Interest Entity [Line Items]
Total Assets	5,320	5,041
Total Liabilities	7,044	6,994
Trading securities [Member]
Variable Interest Entity [Line Items]
Total Assets	590	619
Total Liabilities	590	619
Mortgage loans, net [Member]
Variable Interest Entity [Line Items]
Total Assets	106	106
Total Liabilities	106	106
Other invested assets [Member]
Variable Interest Entity [Line Items]
Total Assets	1,614	1,509
Total Liabilities	1,822	1,897
Structured securities (RMBS, CMBS, and ABS) [Member]
Variable Interest Entity [Line Items]
Total Assets	70,121	67,176
Total Liabilities	70,121	67,176
U.S. corporate and foreign corporate securities [Member]
Variable Interest Entity [Line Items]
Total Assets	3,881	3,966
Total Liabilities	3,881	3,966
Non-redeemable preferred stock [Member]
Variable Interest Entity [Line Items]
Total Assets	41	35
Total Liabilities	$ 41	$ 35