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Investments - Summary (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Summary of investments        
Allowance for credit losses $ 60 $ 63 $ 59 $ 59
Ameriprise Financial        
Summary of investments        
Available-for-Sale securities, at fair value 52,246 51,562    
Mortgage loans (allowance for credit losses: 2024, $14; 2023, $14) 2,155 2,118    
Policy loans 926 912    
Other investments (allowance for credit losses: 2024, $6; 2023, $6) 922 897    
Total 56,249 55,489    
Ameriprise Financial | Mortgage loans        
Summary of investments        
Allowance for credit losses 14 14    
Ameriprise Financial | Other investments        
Summary of investments        
Allowance for credit losses $ 6 $ 6