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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 |

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