Fair Values of Assets and Liabilities - Changes in Level 3 Assets (Details) - Ameriprise Financial - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Available-for-Sale securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	$ 736	$ 747
Total gains (losses) included in net income	1	1
Total gains (losses) included in other comprehensive income (loss)	(6)	9
Purchases	149	74
Settlements	(12)	(33)
Transfers out of Level 3	(24)	(38)
Balance, ending	844	760
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	1	1
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	(6)	9
Corporate debt securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	711	583
Total gains (losses) included in net income	1	1
Total gains (losses) included in other comprehensive income (loss)	(6)	9
Purchases	14	49
Settlements	(12)	(13)
Transfers out of Level 3	0	0
Balance, ending	708	629
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	1	1
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	(6)	9
Residential mortgage backed securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	24	38
Total gains (losses) included in net income	0	0
Total gains (losses) included in other comprehensive income (loss)	0	0
Purchases	0	25
Settlements	0	0
Transfers out of Level 3	(24)	(38)
Balance, ending	0	25
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	0	0
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	0	0
Commercial 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	135
Settlements	0
Transfers out of Level 3	0
Balance, ending	135
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	0
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	126
Total gains (losses) included in net income	0	0
Total gains (losses) included in other comprehensive income (loss)	0	0
Purchases	0	0
Settlements	0	(20)
Transfers out of Level 3	0	0
Balance, ending	1	106
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	0	0
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	59	55
Total gains (losses) included in net income	(3)	0
Total gains (losses) included in other comprehensive income (loss)	0	0
Purchases	0	0
Settlements	(3)	(2)
Transfers out of Level 3	0	0
Balance, ending	53	53
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	0	0
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.

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

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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.

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