Managed Investment Entities (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 collateralizedloanobligation	Mar. 31, 2013	Dec. 31, 2013
Variable Interest Entity [Line Items]
Percentage of investment of most subordinate debt tranche, Minimum	7.50%
Percentage of investment of most subordinate debt tranche, Maximum	51.20%
Number of collateralized loan obligation entities	11
Proceeds received by subsidiaries related to redemptions of managed investment entities liabilities	$ 29	$ 18
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments	14		15
Difference between aggregate unpaid principal balance and fair value of CLOs' debt	109		109
Carrying amount of CLO loans in default	2		1
Aggregate unpaid principal balance of CLO loans in default	6		6
Variable interest entity, primary beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations	260		271
Subordinated debt obligations [Member] | Variable interest entity, primary beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations	101
Senior debt obligations [Member]
Variable Interest Entity [Line Items]
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date	3	70
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date	$ 3	$ 67