Financing Receivables (Credit Quality Information Text) (Details 2)	12 Months Ended
Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)
Nonperforming Financial Instruments
Credit quality information [Line Items]
Nonperforming loans	$ 21,000,000	$ 25,000,000
Commercial mortgage loans [Member]
Credit quality information [Line Items]
Nonperforming loans	$ 0
Percentage of commercial mortgage loans with highest risk rating	1.00%
Financing Receivable, Modifications, Number of Contracts \| loan	93
Impaired Financing Receivable, Unpaid Principal Balance	$ 369,000,000
Impaired Financing Receivable, Unpaid Interest Balance	10,000,000
Total loans, gross	$ 2,725,000,000	2,797,000,000
Commercial mortgage loans [Member] \| Interest receivable
Credit quality information [Line Items]
Financing Receivable, Modifications, Number of Contracts \| loan	1
Syndicated loans [Member]
Credit quality information [Line Items]
Nonperforming loans	$ 3,000,000	1,000,000
Total loans, gross	595,000,000	543,000,000
Loans to financial advisors [Member]
Credit quality information [Line Items]
Total loans, gross	715,000,000
Allowance for loan losses related to loans to financial advisors no longer affiliated with Ameriprise Financial	$ 7,000,000	$ 10,000,000
Credit Card Receivable
Credit quality information [Line Items]
Financing Receivable, Percent Past Due	1.00%	2.00%

Allowance for loan losses related to loans to financial advisors no longer affiliated with Ameriprise Financial

No definition available.

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- Definition

Amount of unpaid interest balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of commercial mortgage loans that the company has assigned its highest risk rating.

+ References

No definition available.

+ Details

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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.

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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- Definition

Percentage of financing receivable balance that is past due.

+ References

No definition available.

+ Details

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- Definition

Amount of financing receivable past due.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 55
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Balance Type:	debit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

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-Publisher FASB
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- Details

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