Managed Investment Entities - Narrative (Details) $ in Millions	1 Months Ended		9 Months Ended
	May 31, 2016 USD ($)	May 31, 2015 USD ($)	Sep. 30, 2016 USD ($) collateralizedloanobligation	Sep. 30, 2015 USD ($)	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			$ 19
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date			15
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			93		$ 214
Difference between aggregate unpaid principal balance and carrying value of CLOs' debt			159		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
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations			245		$ 266
New Collateralized Loan Obligation Entities
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 | Variable interest entity, primary beneficiary
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations			126
Subordinated Debt Obligations | New collateralized loan obligation temporary warehousing entities
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations			$ 40