Managed Investment Entities (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 collateralizedloanobligation	Dec. 31, 2012 collateralizedloanobligation
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
Number of collateralized loan obligation entities formed during the period	2	2
Proceeds received by subsidiaries related to redemptions of managed investment entities liabilities	$ 142
Number of collateralized loan obligation entities that were substantially liquidated during the period	2
Difference between aggregate unpaid principal balance and fair value of CLOs' fixed maturity investments	15	29
Difference between aggregate unpaid principal balance and fair value of CLOs' debt	109	123
Carrying amount of CLO loans in default	1	5
Aggregate unpaid principal balance of CLO loans in default	6	12
Variable interest entity, primary beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations	271	257
New collateralized loan obligation entities [Member]
Variable Interest Entity [Line Items]
Face value of liabilities issued by managed investment entities on issuance date	829	860
Face amount of managed investment entities liabilities purchased by subsidiaries at issuance date	85	74
Subordinated debt obligations [Member] | Variable interest entity, primary beneficiary [Member]
Variable Interest Entity [Line Items]
Aggregate fair value of investment in collateralized loan obligations	88
Senior debt obligations [Member]
Variable Interest Entity [Line Items]
Face amount of managed investment entities liabilities purchased by subsidiaries after issuance date	94	74
Amount paid by subsidiaries to purchase managed investment entities liabilities after issuance date	$ 89	$ 69