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Investments - Summary of Fixed Maturity Securities by Rating (Details) - Ameriprise Financial - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Investments    
Amortized Cost $ 53,048 $ 43,384
Fair Value 51,562 40,811
Fixed maturity securities rated internally 282 270
Holdings of single issuer greater than 10% of equity 0 0
AAA    
Investments    
Amortized Cost 25,235 30,900
Fair Value 24,342 28,980
AA    
Investments    
Amortized Cost 14,013 1,219
Fair Value 13,534 1,249
A    
Investments    
Amortized Cost 3,073 2,080
Fair Value 3,139 2,097
BBB    
Investments    
Amortized Cost 10,396 8,524
Fair Value 10,216 7,890
Below investment grade    
Investments    
Amortized Cost 331 661
Fair Value 331 595
CLOs | Below investment grade    
Investments    
Amortized Cost 1 1
Fair Value $ 1 $ 1
Total investments | Credit concentration risk    
Investments    
Concentration risk 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 47.00% 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 6.00% 5.00%
Fixed maturity securities | Credit concentration risk | BBB    
Investments    
Percentage of total 20.00% 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    
Concentration risk   30.00%
Fixed maturity securities | Credit concentration risk | GNMA, FNMA and FHLMC mortgage backed securities. | AA    
Investments    
Concentration risk 83.00%