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Variable Interest Entities (CLO Debt) (Details 7) (Consolidated investment entities [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Floating Rate Debt Instrument, Fair Value	846amp_FloatingRateDebtInstrumentFairValue	$ 837amp_FloatingRateDebtInstrumentFairValue
Derivative liability	10us-gaap_DerivativeLiabilities	$ 10us-gaap_DerivativeLiabilities
Effective interest rate reflecting the impact of derivative contracts	3.20%	3.10%
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate according to the terms of CDO structure	0.00%
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate according to the terms of CDO structure	9.23%

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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