Investments (Consolidated Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Total Assets	$ 8,558	$ 6,692
Total Liabilities	3,684	2,567
Consolidated Securitization Entities [Member]
Variable Interest Entity [Line Items]
Total Assets	2,095	0
Total Liabilities	1,777	0
MRSC collateral financing arrangement [Member]
Variable Interest Entity [Line Items]
Total Assets	3,440	3,439
Total Liabilities	0	0
Operating joint venture [Member]
Variable Interest Entity [Line Items]
Total Assets	1,630	2,730
Total Liabilities	1,457	2,545
Other limited partnership interests [Member]
Variable Interest Entity [Line Items]
Total Assets	61	356
Total Liabilities	0	8
Real estate joint ventures [Member]
Variable Interest Entity [Line Items]
Total Assets	1,181	11
Total Liabilities	443	14
Other invested assets [Member]
Variable Interest Entity [Line Items]
Total Assets	82	85
Total Liabilities	7	0
Actively traded securities [Member]
Variable Interest Entity [Line Items]
Total Assets	69	71
Total Liabilities	$ 0	$ 0