Managed Investment Entities (Details Textual) $ in Millions	1 Months Ended	6 Months Ended
	May. 31, 2015 USD ($)	Jun. 30, 2015 USD ($) collateralizedloanobligation	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
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		51.20%
Number of collateralized loan obligation entities | collateralizedloanobligation		13
Proceeds received by subsidiaries related to redemptions of managed investment entities liabilities		$ 1	$ 54
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments		63		$ 83
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt		134		131
Carrying amount of CLO loans in default		2		2
Aggregate unpaid principal balance of CLO loans in default		10		6
Variable interest entity, primary beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations		319		$ 289
New Collateralized Loan Obligation Entities [Member]
Variable Interest Entity [Line Items]
Face value of liabilities issued by managed investment entities on issuance date	$ 511
Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date	$ 45
Subordinated debt obligations [Member] | Variable interest entity, primary beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations		$ 87
Senior debt obligations [Member]
Variable Interest Entity [Line Items]
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date			6
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date			$ 6