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Investments - Summary of Fixed Maturity Securities by Rating (Details) - Ameriprise Financial - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Investments    
Amortized Cost $ 53,926 $ 53,048
Fair Value 52,153 51,562
Fixed maturity securities rated internally 508 282
Holdings of single issuer greater than 10% of equity 0 0
AAA    
Investments    
Amortized Cost 25,251 25,235
Fair Value 24,614 24,342
AA    
Investments    
Amortized Cost 13,498 14,013
Fair Value 12,909 13,534
A    
Investments    
Amortized Cost 2,979 3,073
Fair Value 2,935 3,139
BBB    
Investments    
Amortized Cost 11,896 10,396
Fair Value 11,402 10,216
Below investment grade    
Investments    
Amortized Cost 302 331
Fair Value $ 293 $ 331
Total investments | Credit concentration risk    
Investments    
Concentration risk 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 25.00% 26.00%
Fixed maturity securities | Credit concentration risk | A    
Investments    
Percentage of total 5.00% 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. | AAA    
Investments    
Concentration risk   83.00%
Fixed maturity securities | Credit concentration risk | GNMA, FNMA and FHLMC mortgage backed securities. | AA    
Investments    
Concentration risk 82.00%