Investments (Consolidated Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Variable Interest Entity [Line Items]
Total Assets	$ 284	$ 1,506
Total Liabilities	108	552
Fixed Maturities [Member]
Variable Interest Entity [Line Items]
Total Assets	163	159
Total Liabilities	78	80
Other invested assets
Variable Interest Entity [Line Items]
Total Assets	59	82
Total Liabilities	0	7
Other limited partnership interests
Variable Interest Entity [Line Items]
Total Assets	37	61
Total Liabilities	0	0
Consolidated Entities [Member]
Variable Interest Entity [Line Items]
Total Assets	16	23
Total Liabilities	15	22
Real estate joint ventures
Variable Interest Entity [Line Items]
Total Assets	9	1,181
Total Liabilities	$ 15	$ 443