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Variable Annuity and Insurance Guarantees (VA Guarantees Details Text) (Details) - GMAB [Member] | 12 Months Ended
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Dec. 31, 2019
Variable Annuity Guarantees by Benefit Type |
Maximum age of variable annuity contractholders | 79 years
GMAB rider guarantees waiting period | 10 years

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- Definition Represents the waiting period for GMAB rider guarantees. + References No definition available. + Details
Name: | amp_GMABRiderGuaranteesWaitingPeriod
Namespace Prefix: | amp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the maximum age of variable annuity contractholders for obtaining the principal-back guarantee by purchasing the optional GMAB rider for an additional charge. + References No definition available. + Details
Name: | amp_MaximumAgeOfVariableAnnuityContractholders
Namespace Prefix: | amp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_NetAmountAtRiskByProductAndGuaranteeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_GuaranteedInsuranceContractTypeOfGuaranteeAxis=us-gaap_GuaranteedMinimumAccumulationBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |