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Investments - Rollforward of Allowance for Credit Losses (Details) - Ameriprise Financial - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Rollforward of Available-for-Sale securities allowance for credit losses
Beginning Balance	$ 9	$ 2	$ 22
Reductions for securities sold during the period (realized)	(8)	(1)	(21)
Additions for which credit losses were not previously recorded		4
Ending Balance	1	5	1
Corporate debt securities
Rollforward of Available-for-Sale securities allowance for credit losses
Beginning Balance	7	1	20
Reductions for securities sold during the period (realized)	(7)	(1)	(20)
Additions for which credit losses were not previously recorded		0
Ending Balance	0	0	0
Commercial mortgage backed securities
Rollforward of Available-for-Sale securities allowance for credit losses
Beginning Balance	0	0	0
Reductions for securities sold during the period (realized)	0	0	0
Additions for which credit losses were not previously recorded		4
Ending Balance	0	4	0
State and municipal obligations
Rollforward of Available-for-Sale securities allowance for credit losses
Beginning Balance	2	1	2
Reductions for securities sold during the period (realized)	(1)	0	(1)
Additions for which credit losses were not previously recorded		0
Ending Balance	$ 1	$ 1	$ 1

X

- Definition

Amount of expense for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), for which no credit loss was previously recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

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X

- Definition

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

+ References

No definition available.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

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