Investments and Derivative Instruments (Details 11) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Variable Interest Entities Primary Beneficiary
Total Liabilities	$ 30	$ 35
Variable Interest Entity Assets Included in Limited Partnerships and Other Alternative Investments	3	4
Consolidated VIEs [Member]
Variable Interest Entities Primary Beneficiary
Total Assets	148	150
Maximum Exposure to Loss	123	121
Collateralized Debt Obligations [Member] | Consolidated VIEs [Member]
Variable Interest Entities Primary Beneficiary
Total Assets	8	12
Total Liabilities	9	13
Maximum Exposure to Loss	0	0
Investment Funds [Member] | Consolidated VIEs [Member]
Variable Interest Entities Primary Beneficiary
Total Assets	137	134
Total Liabilities	20	20
Maximum Exposure to Loss	121	119
Limited partnerships [Member] | Consolidated VIEs [Member]
Variable Interest Entities Primary Beneficiary
Total Liabilities	1	2
Maximum Exposure to Loss	$ 2	$ 2