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Investments - Available-for-Sale Securities by Contractual Maturity (Details) - Ameriprise Financial - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Amortized cost    
Due within one year $ 1,728  
Due after one year through five years 2,183  
Due after five years through 10 years 3,052  
Due after 10 years 3,640  
Total having single maturity dates 10,603  
Amortized cost 28,408 $ 33,601
Fair value    
Due within one year 1,736  
Due after one year through five years 2,324  
Due after five years through 10 years 3,169  
Due after 10 years 4,896  
Total having single maturity dates 12,125  
Fair value 30,114 36,283
Residential mortgage backed securities    
Amortized cost    
Without single maturity dates 9,628  
Amortized cost 9,628 9,845
Fair value    
Without single maturity dates 9,699  
Fair value 9,699 10,029
Commercial mortgage backed securities    
Amortized cost    
Without single maturity dates 4,712  
Amortized cost 4,712 5,867
Fair value    
Without single maturity dates 4,795  
Fair value 4,795 6,088
Asset backed securities    
Amortized cost    
Without single maturity dates 3,465  
Amortized cost 3,465 3,283
Fair value    
Without single maturity dates 3,495  
Fair value $ 3,495 $ 3,329