Fair Values of Assets and Liabilities - Changes in Level 3 Assets (Details) - Ameriprise Financial - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Available-for-Sale securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	$ 470	$ 411
Total gains (losses) included in Net income	0
Total gains (losses) included in Other comprehensive income (loss)	(3)	8
Purchases	77	55
Settlements	(13)	(29)
Balance, ending	531	445
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	(3)	8
Corporate debt securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	469	405
Total gains (losses) included in Net income	0
Total gains (losses) included in Other comprehensive income (loss)	(3)	8
Purchases	52	55
Settlements	(13)	(28)
Balance, ending	505	440
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	(3)	8
Residential mortgage backed securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	0
Total gains (losses) included in Net income	0
Total gains (losses) included in Other comprehensive income (loss)	0
Purchases	25
Settlements	0
Balance, ending	25
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	0
Asset backed securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	1	6
Total gains (losses) included in Net income	0
Total gains (losses) included in Other comprehensive income (loss)	0	0
Purchases	0	0
Settlements	0	(1)
Balance, ending	1	5
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	0	0
Fixed deferred indexed annuities ceded embedded derivatives
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	51	48
Total gains (losses) included in Net income	4
Total gains (losses) included in Other comprehensive income (loss)	0	0
Purchases	0	0
Settlements	(1)	0
Balance, ending	54	48
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	$ 0	$ 0

Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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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.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(1a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-SubTopic 10
-Topic 820
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-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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