Fair Values of Assets and Liabilities - Changes in Level 3 Assets (Details) - Ameriprise Financial - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Available-for-Sale securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	$ 470	$ 411	$ 544
Total gains (losses) included in Net income	1	0	(1)
Total gains (losses) included in Other comprehensive income (loss)	1	11	(49)
Purchases	526	126	572
Settlements	(118)	(78)	(91)
Transfers out of Level 3	(133)		(564)
Balance, ending	747	470	411
Changes in unrealized gains (losses) 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	(2)	11	(43)
Corporate debt securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	469	405	502
Total gains (losses) included in Net income	1	0	(1)
Total gains (losses) included in Other comprehensive income (loss)	1	11	(44)
Purchases	228	126	39
Settlements	(116)	(73)	(91)
Transfers out of Level 3	0		0
Balance, ending	583	469	405
Changes in unrealized gains (losses) 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	(2)	11	(42)
Residential mortgage backed securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	0	0	0
Total gains (losses) included in Net income	0		0
Total gains (losses) included in Other comprehensive income (loss)	0		(4)
Purchases	150		389
Settlements	(2)		0
Transfers out of Level 3	(110)		(385)
Balance, ending	38	0	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
Commercial mortgage backed securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning		0	35
Total gains (losses) included in Net income			0
Total gains (losses) included in Other comprehensive income (loss)			0
Purchases			112
Settlements			0
Transfers out of Level 3			(147)
Balance, ending			0
Changes in unrealized gains (losses) 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
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	1	6	7
Total gains (losses) included in Net income	0	0	0
Total gains (losses) included in Other comprehensive income (loss)	0	0	(1)
Purchases	148	0	32
Settlements	0	(5)	0
Transfers out of Level 3	(23)		(32)
Balance, ending	126	1	6
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	(1)
Fixed deferred indexed annuities ceded embedded derivatives
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	51	48	59
Total gains (losses) included in Net income	8	6	(8)
Total gains (losses) included in Other comprehensive income (loss)	0	0	0
Purchases	0	0	0
Settlements	(4)	(3)	(3)
Transfers out of Level 3	0		0
Balance, ending	55	51	48
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

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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