Managed Investment Entities (Details Textual) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) collateralizedloanobligation	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Variable Interest Entity [Line Items]
Percentage of investment of most subordinate debt tranche, Minimum	15.00%
Percentage of investment of most subordinate debt tranche, Maximum	86.10%
Number of collateralized loan obligation entities | collateralizedloanobligation	13
Proceeds received by subsidiaries related to redemptions of managed investment entities liabilities	$ 23	$ 1
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments	211		$ 214
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt	242		205
Carrying amount of CLO loans in default	8		1
Aggregate unpaid principal balance of CLO loans in default	21		10
Variable interest entity, primary beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations	250		$ 266
Subordinated Debt Obligations [Member] | Variable interest entity, primary beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations	113
Senior Debt Obligations [Member]
Variable Interest Entity [Line Items]
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date	11
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date	$ 10