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Investments - Available-for-Sale Securities by Type (Details) - Ameriprise Financial - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Investments
Amortized Cost	$ 53,144	$ 53,926
Gross Unrealized Gains	752	353
Gross Unrealized Losses	(1,318)	(2,121)
Allowance for Credit Losses	(4)	(5)	$ (5)	$ (5)	$ (5)	$ (2)
Fair Value	52,574	52,153
Accrued interest excluded from amortized cost basis	$ 351	$ 326
Total investments | Credit concentration risk
Investments
Percentage of total	92.00%	92.00%
Corporate debt securities
Investments
Amortized Cost	$ 15,295	$ 14,509
Gross Unrealized Gains	422	201
Gross Unrealized Losses	(425)	(711)
Allowance for Credit Losses	0	0	0	0	0	(1)
Fair Value	15,292	13,999
Residential mortgage backed securities
Investments
Amortized Cost	27,216	24,396
Gross Unrealized Gains	251	81
Gross Unrealized Losses	(735)	(1,133)
Allowance for Credit Losses	0	0
Fair Value	26,732	23,344
Commercial mortgage backed securities
Investments
Amortized Cost	3,898	5,339
Gross Unrealized Gains	15	10
Gross Unrealized Losses	(120)	(219)
Allowance for Credit Losses	(3)	(4)	(4)	(4)	(4)	0
Fair Value	3,790	5,126
Asset backed securities
Investments
Amortized Cost	4,309	6,451
Gross Unrealized Gains	24	30
Gross Unrealized Losses	(23)	(39)
Allowance for Credit Losses	0	0
Fair Value	4,310	6,442
State and municipal obligations
Investments
Amortized Cost	635	629
Gross Unrealized Gains	39	29
Gross Unrealized Losses	(15)	(19)
Allowance for Credit Losses	(1)	(1)	$ (1)	$ (1)	$ (1)	$ (1)
Fair Value	658	638
U.S. government and agency obligations
Investments
Amortized Cost	1,784	2,589
Gross Unrealized Gains	1	2
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	1,785	2,591
Foreign government bonds and obligations
Investments
Amortized Cost	7	13
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	$ 7	$ 13

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