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Customer Deposits - Investment Certificates (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Investment Certificates |  |
Amount of reserves that do not allow for a surrender charge | $ 1,500,000 | $ 2,200,000
Minimum |  |
Investment Certificates |  |
Amount of fixed rate investment certificates | $ 1 |
Term of fixed rate investment certificates | 3 months |
Maximum |  |
Investment Certificates |  |
Amount of fixed rate investment certificates | $ 2,000 |
Term of fixed rate investment certificates | 36 months |

X
- Definition Represents the amount of fixed rate investment certificates offered by the entity. + References No definition available. + Details
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Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of reserves that do not allow for a surrender charge. + References No definition available. + Details
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Namespace Prefix: | amp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Period of time between issuance and maturity of investment certificates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | amp_MaturityOfInvestmentCertificates
Namespace Prefix: | amp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
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Period Type: |