Financing Receivables (Allowance for Loan Losses) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Rollforward of the allowance for loan losses
Beginning balance			$ 26	$ 29
Financing Receivable, Allowance for Credit Losses, Write-downs			(2)	0
Ending balance	$ 24	$ 29	24	29
Individually evaluated for impairment	0	2	0	2
Collectively evaluated for impairment	24	27	24	27
Credit quality information [Line Items]
Individually evaluated for impairment	13		13		$ 17
Collectively evaluated for impairment	3,226		3,226		3,258
Total	3,239		3,239		3,275
Recorded investment in financing receivables individually evaluated for impairment with no related allowance for loan losses	13		13		17
Syndicated loans [Member]
Credit quality information [Line Items]
Total	531		531		498
Loans purchased	112	66	145	136
Loans sold	33	$ 4	36	$ 4
Loans to financial advisors [Member] [Member]
Credit quality information [Line Items]
Principal amounts outstanding for advisor loans	510		510		509
Allowance for loan losses related to loans to financial advisors	22		22		23
Principal amounts outstanding for advisor loans no longer affiliated with the Ameriprise Financial	17		17		19
Allowance for loan losses related to loans to financial advisors no longer affiliated with Ameriprise Financial	$ 12		$ 12		$ 12

Allowance for loan losses related to loans to financial advisors

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

+ References

No definition available.

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Principal amounts outstanding for advisor loans

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Principal amounts outstanding for advisor loans no longer affiliated with Ameriprise Financial

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- References

No definition available.

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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of direct write-downs of financing receivables charged against the allowance.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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The balance of financing receivables that were collectively evaluated for impairment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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The balance of financing receivables that were individually evaluated for impairment.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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The amount of any significant purchases of financing receivables during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-Paragraph 11B
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The amount of any significant sales of financing receivables during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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