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Commitments, Guarantees and Contingencies Future Funding Commitments (Details 2) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |  |
Commercial mortgage loans | $ 18 | $ 60
Affordable housing partnerships and other real estate partnerships | 12 | 22
Property Funds Funding Commitments | 17 | 12
Private funds | 9 | 12
Pledged Asset Lines of Credit | 342 | 0
Consumer lines of credit | 1 | 1
Total funding commitments | $ 399 | $ 107

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- Definition The amount of the obligation related to Affordable Housing partnerships, which qualify for low income tax credits. + References No definition available. + Details
Name: | amp_AffordableHousingProgramObligationAmountQualifyingForLowIncomeTaxCredits
Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the amount of future commercial mortgage loan commitments of the entity. + References No definition available. + Details
Name: | amp_CommercialMortgageLoanFundingCommitments
Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of future consumer lines of credit commitments of the entity. + References No definition available. + Details
Name: | amp_ConsumerLinesOfCreditFundingCommitments
Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the amount of entity's total funding commitments in future. + References No definition available. + Details
Name: | amp_FundingCommitments
Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Pledged Asset Lines of Credit + References No definition available. + Details
Name: | amp_PledgedAssetLinesOfCredit
Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of future funding commitments for private funds. + References No definition available. + Details
Name: | amp_PrivateFundsFundingCommitments
Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Property Funds Funding Commitments + References No definition available. + Details
Name: | amp_PropertyFundsFundingCommitments
Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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