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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Principles of Consolidation      
Minimum percentage of voting interest required to be held to consolidate an entity 50.00%amp_ConsolidationOfEntityMinimumOwnershipPercentage    
Maximum percentage of voting interest required to be held to be accounted for, under the cost method 20.00%amp_CostMethodInvestmentOwnershipPercentageHighEndOfRange    
Financing Receivables      
Nonaccrual status period for loans 90 days    
Period for charging off revolving unsecured consumer lines 180 days    
Period for charging off closed-end consumer loans, other than loans secured by one to four family properties 120 days    
Land, Buildings, Equipment and Software      
Land, buildings, equipment and software, net of accumulated depreciation $ 667us-gaap_PropertyPlantAndEquipmentNet $ 705us-gaap_PropertyPlantAndEquipmentNet  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 1,400us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 1,300us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Depreciation and amortization expense for the year $ 144us-gaap_Depreciation $ 144us-gaap_Depreciation $ 152us-gaap_Depreciation
Minimum [Member]      
Principles of Consolidation      
Percentage of voting interest required to be held to be accounted for under the equity method 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Land, Buildings, Equipment and Software      
Amortization periods 3 years    
Maximum [Member]      
Principles of Consolidation      
Percentage of voting interest required to be held to be accounted for under the equity method 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Land, Buildings, Equipment and Software      
Amortization periods 39 years