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Investments - Available-for-Sale Securities by Type (Details) - Ameriprise Financial - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2025	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Investments
Amortized Cost	$ 55,449	$ 54,137
Gross Unrealized Gains	422	728
Gross Unrealized Losses	(1,488)	(1,269)
Allowance for Credit Losses	(1)	(5)	$ (1)	$ (5)	$ (5)	$ (5)
Fair Value	54,382	53,591
Accrued interest excluded from amortized cost basis	$ 356	$ 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	91.00%	92.00%
Corporate debt securities
Investments
Amortized Cost	$ 17,136	$ 15,911
Gross Unrealized Gains	271	395
Gross Unrealized Losses	(555)	(464)
Allowance for Credit Losses	0	0
Fair Value	16,852	15,842
Residential mortgage backed securities
Investments
Amortized Cost	28,649	28,578
Gross Unrealized Gains	109	261
Gross Unrealized Losses	(785)	(666)
Allowance for Credit Losses	0	0
Fair Value	27,973	28,173
Commercial mortgage backed securities
Investments
Amortized Cost	3,590	3,778
Gross Unrealized Gains	4	16
Gross Unrealized Losses	(108)	(103)
Allowance for Credit Losses	0	(4)	0	(4)	(4)	(4)
Fair Value	3,486	3,687
Asset backed securities
Investments
Amortized Cost	3,820	3,755
Gross Unrealized Gains	7	19
Gross Unrealized Losses	(23)	(21)
Allowance for Credit Losses	0	0
Fair Value	3,804	3,753
State and municipal obligations
Investments
Amortized Cost	677	657
Gross Unrealized Gains	31	36
Gross Unrealized Losses	(17)	(15)
Allowance for Credit Losses	(1)	(1)	$ (1)	$ (1)	$ (1)	$ (1)
Fair Value	690	677
U.S. government and agency obligations
Investments
Amortized Cost	1,576	1,457
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	1,576	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