Investments - Available-for-Sale Securities by Type (Details) - Ameriprise Financial - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Investments
Amortized Cost	$ 55,073	$ 54,137
Gross Unrealized Gains	465	728
Gross Unrealized Losses	(1,501)	(1,269)
Allowance for Credit Losses	(1)	(5)	$ (5)	$ (5)
Fair Value	54,036	53,591
Accrued interest excluded from amortized cost basis	$ 359	$ 332
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Receivables	Receivables
Total investments \| Credit concentration risk
Investments
Percentage of total	92.00%	92.00%
Corporate debt securities
Investments
Amortized Cost	$ 16,694	$ 15,911
Gross Unrealized Gains	274	395
Gross Unrealized Losses	(610)	(464)
Allowance for Credit Losses	0	0
Fair Value	16,358	15,842
Residential mortgage backed securities
Investments
Amortized Cost	28,848	28,578
Gross Unrealized Gains	141	261
Gross Unrealized Losses	(746)	(666)
Allowance for Credit Losses	0	0
Fair Value	28,243	28,173
Commercial mortgage backed securities
Investments
Amortized Cost	3,722	3,778
Gross Unrealized Gains	8	16
Gross Unrealized Losses	(109)	(103)
Allowance for Credit Losses	0	(4)	(4)	(4)
Fair Value	3,621	3,687
Asset backed securities
Investments
Amortized Cost	3,558	3,755
Gross Unrealized Gains	10	19
Gross Unrealized Losses	(20)	(21)
Allowance for Credit Losses	0	0
Fair Value	3,548	3,753
State and municipal obligations
Investments
Amortized Cost	648	657
Gross Unrealized Gains	32	36
Gross Unrealized Losses	(16)	(15)
Allowance for Credit Losses	(1)	(1)	$ (1)	$ (1)
Fair Value	663	677
U.S. government and agency obligations
Investments
Amortized Cost	1,602	1,457
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	1,602	1,458
Foreign government bonds and obligations
Investments
Amortized Cost	1	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	$ 1	$ 1

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