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Investments - Summary of Fixed Maturity Securities by Rating (Details) - Ameriprise Financial - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Investments    
Fixed maturity securities rated internally $ 661 $ 508
Amortized Cost 55,437 53,926
Fair Value 54,150 52,153
AAA    
Investments    
Amortized Cost 24,491 25,251
Fair Value 23,979 24,614
AA    
Investments    
Amortized Cost 15,297 13,498
Fair Value 14,889 12,909
A    
Investments    
Amortized Cost 3,307 2,979
Fair Value 3,305 2,935
BBB    
Investments    
Amortized Cost 12,022 11,896
Fair Value 11,663 11,402
Below investment grade    
Investments    
Amortized Cost 320 302
Fair Value $ 314 $ 293
Total investments | Credit concentration risk    
Investments    
Percentage of total 93.00% 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 44.00% 47.00%
Fixed maturity securities | Credit concentration risk | AA    
Investments    
Percentage of total 27.00% 25.00%
Fixed maturity securities | Credit concentration risk | A    
Investments    
Percentage of total 6.00% 5.00%
Fixed maturity securities | Credit concentration risk | BBB    
Investments    
Percentage of total 22.00% 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