v3.26.1
Investments - Summary of Fixed Maturity Securities by Rating (Details) - Ameriprise Financial - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Investments    
Fixed maturity securities rated internally $ 726 $ 662
Amortized Cost 55,073 54,137
Fair Value 54,036 53,591
AAA    
Investments    
Amortized Cost 18,868 19,744
Fair Value 18,523 19,489
AA    
Investments    
Amortized Cost 19,708 18,446
Fair Value 19,375 18,259
A    
Investments    
Amortized Cost 5,006 4,445
Fair Value 4,956 4,468
BBB    
Investments    
Amortized Cost 11,100 11,169
Fair Value 10,828 11,067
Below investment grade    
Investments    
Amortized Cost 391 333
Fair Value $ 354 $ 308
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 34.00% 36.00%
Fixed maturity securities | Credit concentration risk | AA    
Investments    
Percentage of total 36.00% 34.00%
Fixed maturity securities | Credit concentration risk | A    
Investments    
Percentage of total 9.00% 8.00%
Fixed maturity securities | Credit concentration risk | BBB    
Investments    
Percentage of total 20.00% 21.00%
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% 86.00%
Total equity    
Investments    
Holdings of single issuer greater than 10% of equity $ 0 $ 0