Fair Values of Assets and Liabilities - Changes in Level 3 Assets (Details) - Ameriprise Financial - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Available-for-Sale Securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	$ 844
Total gains (losses) included in net income	0
Total gains (losses) included in other comprehensive income (loss)	(3)
Purchases	94
Settlements	(2)
Transfers out of Level 3	(135)
Balance, ending	798		$ 798
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	1
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	(4)
Available-for-Sale Securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning		$ 760	736	$ 747
Total gains (losses) included in net income		0	1	1
Total gains (losses) included in other comprehensive income (loss)		5	(9)	14
Purchases		82	243	156
Settlements		(36)	(14)	(69)
Transfers out of Level 3			(159)	(38)
Balance, ending	798	811	798	811
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		5	(9)	14
Corporate debt securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	708	629	711	583
Total gains (losses) included in net income	0	0	1	1
Total gains (losses) included in other comprehensive income (loss)	(3)	5	(9)	14
Purchases	94	82	108	131
Settlements	(2)	(8)	(14)	(21)
Transfers out of Level 3	0		0	0
Balance, ending	797	708	797	708
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	1		1	1
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	(4)	5	(9)	14
Residential mortgage backed securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning		25	24	38
Total gains (losses) included in net income		0	0	0
Total gains (losses) included in other comprehensive income (loss)		0	0	0
Purchases		0	0	25
Settlements		(2)	0	(2)
Transfers out of Level 3			(24)	(38)
Balance, ending	0	23	0	23
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	0
Commercial mortgage backed securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	135		0
Total gains (losses) included in net income	0		0
Total gains (losses) included in other comprehensive income (loss)	0		0
Purchases	0		135
Settlements	0		0
Transfers out of Level 3	(135)		(135)
Balance, ending	0		0
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
Asset backed securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	1	106	1	126
Total gains (losses) included in net income	0	0	0	0
Total gains (losses) included in other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	0
Settlements	0	(26)	0	(46)
Transfers out of Level 3	0		0	0
Balance, ending	1	80	1	80
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	0		0	0
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	0	0	0	0
Fixed deferred indexed annuity ceded embedded derivatives
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	53	53	59	55
Total gains (losses) included in net income	4	5	1	5
Total gains (losses) included in other comprehensive income (loss)	0	0	0	0
Purchases	0	0	0	0
Settlements	(3)	(1)	(6)	(3)
Transfers out of Level 3	0		0	0
Balance, ending	54	57	54	57
Changes in unrealized gains (losses) included in net income relating to assets held at end of period	0		0	0
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period	$ 0	$ 0	$ 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 unrealized gain (loss) recognized in income 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 income from asset measured at fair value on recurring basis using unobservable input (level 3).

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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 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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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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