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Investments - Summary of Fixed Maturity Securities by Rating (Details) - Ameriprise Financial - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Investments    
Fixed maturity securities rated internally $ 367 $ 282
Amortized Cost 53,598 53,048
Fair Value 51,695 51,562
AAA    
Investments    
Amortized Cost 26,120 25,235
Fair Value 25,303 24,342
AA    
Investments    
Amortized Cost 13,231 14,013
Fair Value 12,611 13,534
A    
Investments    
Amortized Cost 3,302 3,073
Fair Value 3,290 3,139
BBB    
Investments    
Amortized Cost 10,673 10,396
Fair Value 10,218 10,216
Below investment grade    
Investments    
Amortized Cost 272 331
Fair Value 273 331
CLOs | Below investment grade    
Investments    
Amortized Cost 1 1
Fair Value $ 1 $ 1
Total investments | Credit concentration risk    
Investments    
Risk concentration, percentage 93.00% 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 49.00% 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 20.00% 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