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Investments - Summary of Fixed Maturity Securities by Rating (Details) - Ameriprise Financial - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Investments
Fixed maturity securities rated internally	$ 686	$ 508
Amortized Cost	54,204	53,926
Fair Value	53,165	52,153
AAA
Investments
Amortized Cost	22,964	25,251
Fair Value	22,572	24,614
AA
Investments
Amortized Cost	15,474	13,498
Fair Value	15,091	12,909
A
Investments
Amortized Cost	3,896	2,979
Fair Value	3,888	2,935
BBB
Investments
Amortized Cost	11,485	11,896
Fair Value	11,256	11,402
Below investment grade
Investments
Amortized Cost	385	302
Fair Value	$ 358	$ 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	43.00%	47.00%
Fixed maturity securities | Credit concentration risk | AA
Investments
Percentage of total	28.00%	25.00%
Fixed maturity securities | Credit concentration risk | A
Investments
Percentage of total	7.00%	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	85.00%	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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