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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, 2023
Dec. 31, 2022
Investments    
Fixed maturity securities rated internally $ 278 $ 270
Amortized Cost 51,443 43,384
Fair Value 48,193 40,811
AAA    
Investments    
Amortized Cost 24,795 30,900
Fair Value 23,421 28,980
AA    
Investments    
Amortized Cost 13,433 1,219
Fair Value 12,510 1,249
A    
Investments    
Amortized Cost 2,738 2,080
Fair Value 2,655 2,097
BBB    
Investments    
Amortized Cost 10,142 8,524
Fair Value 9,291 7,890
Below investment grade    
Investments    
Amortized Cost 335 661
Fair Value 316 595
CLOs | Below investment grade    
Investments    
Amortized Cost 1 1
Fair Value $ 1 $ 1
Total investments | Credit concentration risk | Fixed maturity securities    
Investments    
Risk concentration, percentage 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 49.00% 71.00%
Fixed maturity securities | Credit concentration risk | AA    
Investments    
Percentage of total 26.00% 3.00%
Fixed maturity securities | Credit concentration risk | A    
Investments    
Percentage of total 5.00% 5.00%
Fixed maturity securities | Credit concentration risk | BBB    
Investments    
Percentage of total 19.00% 19.00%
Fixed maturity securities | Credit concentration risk | Below investment grade    
Investments    
Percentage of total 1.00% 2.00%
Fixed maturity securities | Credit concentration risk | GNMA, FNMA and FHLMC mortgage backed securities. | AAA    
Investments    
Risk concentration, percentage   30.00%
Fixed maturity securities | Credit concentration risk | GNMA, FNMA and FHLMC mortgage backed securities. | AA    
Investments    
Risk concentration, percentage 82.00%  
Total equity | Investment Concentration Risk    
Investments    
Holdings of single issuer greater than 10% of equity $ 0 $ 0