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Investments - Summary of Fixed Maturity Securities by Rating (Details) - Ameriprise Financial - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Investments
Fixed maturity securities rated internally	$ 692	$ 508
Amortized Cost	53,144	53,926
Fair Value	52,574	52,153
AAA
Investments
Amortized Cost	21,208	25,251
Fair Value	20,930	24,614
AA
Investments
Amortized Cost	16,183	13,498
Fair Value	15,933	12,909
A
Investments
Amortized Cost	4,358	2,979
Fair Value	4,406	2,935
BBB
Investments
Amortized Cost	11,049	11,896
Fair Value	10,985	11,402
Below investment grade
Investments
Amortized Cost	346	302
Fair Value	$ 320	$ 293
Total investments | Credit concentration risk
Investments
Percentage of total	92.00%	92.00%
Fixed maturity securities | Credit concentration risk
Investments
Percentage of total	100.00%	100.00%
Fixed maturity securities | Credit concentration risk | AAA
Investments
Percentage of total	40.00%	47.00%
Fixed maturity securities | Credit concentration risk | AA
Investments
Percentage of total	30.00%	25.00%
Fixed maturity securities | Credit concentration risk | A
Investments
Percentage of total	8.00%	5.00%
Fixed maturity securities | Credit concentration risk | BBB
Investments
Percentage of total	21.00%	22.00%
Fixed maturity securities | Credit concentration risk | Below investment grade
Investments
Percentage of total	1.00%	1.00%
Fixed maturity securities | Credit concentration risk | GNMA, FNMA and FHLMC mortgage backed securities. | AA
Investments
Risk concentration, percentage	86.00%	82.00%
Total equity | Investment Concentration Risk
Investments
Holdings of single issuer greater than 10% of equity	$ 0	$ 0

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Fair value of investment subject to concentration of credit or market risk or both.

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