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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, 2024 | Dec. 31, 2023
Investments |  |
Fixed maturity securities rated internally | $ 440 | $ 282
Amortized Cost | 53,006 | 53,048
Fair Value | 52,417 | 51,562
AAA |  |
Investments |  |
Amortized Cost | 25,149 | 25,235
Fair Value | 24,746 | 24,342
AA |  |
Investments |  |
Amortized Cost | 13,043 | 14,013
Fair Value | 12,755 | 13,534
A |  |
Investments |  |
Amortized Cost | 3,114 | 3,073
Fair Value | 3,219 | 3,139
BBB |  |
Investments |  |
Amortized Cost | 11,423 | 10,396
Fair Value | 11,415 | 10,216
Below investment grade |  |
Investments |  |
Amortized Cost | 277 | 331
Fair Value | 282 | 331
CLOs | Below investment grade |  |
Investments |  |
Amortized Cost | 1 | 1
Fair Value | $ 1 | $ 1
Total investments | Credit concentration risk |  |
Investments |  |
Risk concentration, percentage | 92.00% | 93.00%
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 | 47.00% | 47.00%
Fixed maturity securities | Credit concentration risk | AA |  |
Investments |  |
Percentage of total | 24.00% | 26.00%
Fixed maturity securities | Credit concentration risk | A |  |
Investments |  |
Percentage of total | 6.00% | 6.00%
Fixed maturity securities | Credit concentration risk | BBB |  |
Investments |  |
Percentage of total | 22.00% | 20.00%
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% | 83.00%
Total equity | Investment Concentration Risk |  |
Investments |  |
Holdings of single issuer greater than 10% of equity | $ 0 | $ 0

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