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Fair Values of Assets and Liabilities - Changes in Level 3 Assets (Details) - Ameriprise Financial - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Available-for-Sale securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	$ 747	$ 470
Total gains (losses) included in Net income	1	0
Total gains (losses) included in Other comprehensive income (loss)	9	(3)
Purchases	74	77
Settlements	(33)	(13)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(38)
Balance, ending	760	531
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	9	(3)
Corporate debt securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	583	469
Total gains (losses) included in Net income	1	0
Total gains (losses) included in Other comprehensive income (loss)	9	(3)
Purchases	49	52
Settlements	(13)	(13)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0
Balance, ending	629	505
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	9	(3)
Residential mortgage backed securities
Summary of 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	25	25
Settlements	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(38)
Balance, ending	25	25
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	0
Asset backed securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning	126	1
Total gains (losses) included in Net income	0	0
Total gains (losses) included in Other comprehensive income (loss)	0	0
Purchases	0	0
Settlements	(20)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0
Balance, ending	106	1
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	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	55	51
Total gains (losses) included in Net income	0	4
Total gains (losses) included in Other comprehensive income (loss)	0	0
Purchases	0	0
Settlements	(2)	(1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0
Balance, ending	53	54
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	$ 0

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