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Fair Values of Assets and Liabilities - Financial Instruments Not Reported at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Financial Liabilities      
Separate account liabilities - investment contracts $ 81,409 $ 77,457 $ 73,962
Ameriprise Financial      
Financial Assets      
Mortgage loans, net 2,297 2,118  
Policy loans 966 912  
Ameriprise Financial | Carrying Value      
Financial Assets      
Mortgage loans, net 2,297 2,118  
Policy loans 966 912  
Receivables 9,209 9,453  
Restricted and segregated cash 640 936  
Other investments and assets 282 338  
Financial Liabilities      
Policyholder account balances, future policy benefits and claims 19,195 16,641  
Investment certificate reserves 11,990 13,461  
Banking and brokerage deposits 24,364 23,886  
Debt and other liabilities 3,857 3,769  
Ameriprise Financial | Carrying Value | Investment contracts      
Financial Liabilities      
Separate account liabilities - investment contracts 3,146 3,155  
Ameriprise Financial | Fair Value      
Financial Assets      
Mortgage loans, net 2,212 1,972  
Policy loans 966 912  
Receivables 8,290 8,344  
Restricted and segregated cash 640 936  
Other investments and assets 283 338  
Financial Liabilities      
Policyholder account balances, future policy benefits and claims 16,758 14,243  
Investment certificate reserves 11,974 13,420  
Banking and brokerage deposits 24,364 23,886  
Debt and other liabilities 3,914 3,781  
Ameriprise Financial | Fair Value | Investment contracts      
Financial Liabilities      
Separate account liabilities - investment contracts 3,146 3,155  
Ameriprise Financial | Level 1 | Fair Value      
Financial Assets      
Mortgage loans, net 0 0  
Policy loans 0 0  
Receivables 236 146  
Restricted and segregated cash 640 936  
Other investments and assets 0 0  
Financial Liabilities      
Policyholder account balances, future policy benefits and claims 0 0  
Investment certificate reserves 0 0  
Banking and brokerage deposits 24,364 23,886  
Debt and other liabilities 254 166  
Ameriprise Financial | Level 1 | Fair Value | Investment contracts      
Financial Liabilities      
Separate account liabilities - investment contracts 0 0  
Ameriprise Financial | Level 2 | Fair Value      
Financial Assets      
Mortgage loans, net 407 280  
Policy loans 966 912  
Receivables 1,729 1,621  
Restricted and segregated cash 0 0  
Other investments and assets 233 283  
Financial Liabilities      
Policyholder account balances, future policy benefits and claims 0 0  
Investment certificate reserves 0 0  
Banking and brokerage deposits 0 0  
Debt and other liabilities 3,656 3,610  
Ameriprise Financial | Level 2 | Fair Value | Investment contracts      
Financial Liabilities      
Separate account liabilities - investment contracts 3,146 3,155  
Ameriprise Financial | Level 3 | Fair Value      
Financial Assets      
Mortgage loans, net 1,805 1,692  
Policy loans 0 0  
Receivables 6,325 6,577  
Restricted and segregated cash 0 0  
Other investments and assets 50 55  
Financial Liabilities      
Policyholder account balances, future policy benefits and claims 16,758 14,243  
Investment certificate reserves 11,974 13,420  
Banking and brokerage deposits 0 0  
Debt and other liabilities 4 5  
Ameriprise Financial | Level 3 | Fair Value | Investment contracts      
Financial Liabilities      
Separate account liabilities - investment contracts $ 0 $ 0