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Investments - Summary of Fixed Maturity Securities by Rating (Details) - Ameriprise Financial - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Investments    
Fixed maturity securities rated internally $ 422 $ 270
Amortized Cost 46,896 43,384
Fair Value 44,883 40,811
Holdings of single issuer greater than 10% of equity 0 0
AAA    
Investments    
Amortized Cost 33,517 30,900
Fair Value 31,827 28,980
AA    
Investments    
Amortized Cost 1,420 1,219
Fair Value 1,470 1,249
A    
Investments    
Amortized Cost 2,303 2,080
Fair Value 2,369 2,097
BBB    
Investments    
Amortized Cost 9,051 8,524
Fair Value 8,661 7,890
Below investment grade    
Investments    
Amortized Cost 605 661
Fair Value 556 595
CLOs | Below investment grade    
Investments    
Amortized Cost 1 1
Fair Value $ 1 $ 1
Total investments | Credit concentration risk | Fixed maturity securities    
Investments    
Percentage of total 92.00% 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 71.00% 71.00%
Fixed maturity securities | Credit concentration risk | AA    
Investments    
Percentage of total 3.00% 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 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    
Percentage of total 30.00% 30.00%