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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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