Managed Investment Entities (Details Textual) $ in Millions	1 Months Ended	6 Months Ended
	May 31, 2016 USD ($)	Jun. 30, 2016 USD ($) collateralizedloanobligation	Jun. 30, 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		60.70%
Number of collateralized loan obligation entities | collateralizedloanobligation		14
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date		$ 13
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date		12
Proceeds received by subsidiaries related to sales and redemptions of managed investment entities liabilities		69	$ 1
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments		157		$ 214
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt		212		205
Carrying amount of CLO loans in default		1		1
Aggregate unpaid principal balance of CLO loans in default		10		10
Variable interest entity, primary beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations		218		$ 266
New Collateralized Loan Obligation Entities [Member]
Variable Interest Entity [Line Items]
Face value of liabilities issued by managed investment entities on issuance date	$ 406		511
Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date	$ 36		$ 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		$ 102