Fair Values of Assets and Liabilities - Changes in Level 3 Assets (Details) - Ameriprise Financial - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Available-for-Sale securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	$ 747	$ 470	$ 411
Total gains (losses) included in net income	2	1	0
Total gains (losses) included in Other comprehensive income (loss)	18	1	11
Purchases	218	526	126
Settlements	(121)	(118)	(78)
Transfers out of Level 3	(128)	(133)
Balance, ending	736	747	470
Changes in unrealized gains (losses) in net income relating to assets held at end of period	2	1
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	18	(2)	11
Corporate debt securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	583	469	405
Total gains (losses) included in net income	2	1	0
Total gains (losses) included in Other comprehensive income (loss)	18	1	11
Purchases	169	228	126
Settlements	(61)	(116)	(73)
Transfers out of Level 3	0	0
Balance, ending	711	583	469
Changes in unrealized gains (losses) in net income relating to assets held at end of period	2	1
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	18	(2)	11
Residential mortgage backed securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	38	0
Total gains (losses) included in net income	0	0
Total gains (losses) included in Other comprehensive income (loss)	0	0
Purchases	49	150
Settlements	(2)	(2)
Transfers out of Level 3	(61)	(110)
Balance, ending	24	38	0
Changes in unrealized gains (losses) 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
Asset backed securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	126	1	6
Total gains (losses) included in net income	0	0	0
Total gains (losses) included in Other comprehensive income (loss)	0	0	0
Purchases	0	148	0
Settlements	(58)	0	(5)
Transfers out of Level 3	(67)	(23)
Balance, ending	1	126	1
Changes in unrealized gains (losses) 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	0
Fixed deferred indexed annuity ceded embedded derivatives
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	55	51	48
Total gains (losses) included in net income	9	8	6
Total gains (losses) included in Other comprehensive income (loss)	0	0	0
Purchases	0	0	0
Settlements	(5)	(4)	(3)
Transfers out of Level 3	0	0
Balance, ending	59	55	51
Changes in unrealized gains (losses) 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	$ 0

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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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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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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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