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Debt (Narrative) (Details 2) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 02, 2020
Debt and stated interest rates |  |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 762 | $ 313 | $ 13 |
Ameriprise Financial [Member] | Federal Home Loan Bank advances [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Remaining maturity of outstanding amount for short term borrowings |  |  | 3 months | 2 months |  |
Ameriprise Financial [Member] | Senior notes due 2025 [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Proceeds from Issuance of Debt | $ 500 |  |  |  |  |
Debt issuance costs | $ 4 |  |  |  |  |
Stated interest rate (as a percent) long-term debt |  |  | 3.00% |  |  | 3.00%
Ameriprise Financial [Member] | Senior notes due 2020 [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 750 |  |  |  |
Stated interest rate (as a percent) long-term debt |  |  |  | 5.30% |  |
Ameriprise Financial [Member] | Senior notes due 2022 [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Stated interest rate (as a percent) long-term debt |  |  | 3.00% | 3.00% |  |

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