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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