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Customer Deposits - Investment Certificates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Investment Certificates
Amount of reserves that do not allow for a surrender charge	$ 1,200,000	$ 1,500,000
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

Name:	amp_AmountOfInvestmentCertificates
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

Name:	amp_AmountOfReservesThatDoNotAllowForASurrenderCharge
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

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: