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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Footnotes) (Details 4) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Surplus Loan due 2050 |  |  |  |
Investments [Abstract] |  |  |  |
Proceeds from Issuance of Debt | $ 500 |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate | 3.50% | 3.50% |  |
Long-term debt | $ 500 | $ 500 |  |
Ameriprise Financial, Inc: |  |  |  |
Investments [Abstract] |  |  |  |
Long-term debt | 2,831 | 2,831 | $ 3,097 |
Residual tranche fair value | 877 | 877 | 1,430 |
Guarantees, Commitments and Contingencies |  |  |  |
Maximum borrowing capacity under the line of credit | 366 | 366 |  |
Loans to subsidiaries | 247 | 247 | 361 |
Current borrowing capacity under the line of credit | 1,300 | 1,300 | 1,300 |
Outstanding amount | 172 | 172 | 50 |
Ameriprise Financial, Inc: | Ameriprise Certificate Company [Member] |  |  |  |
Guarantees, Commitments and Contingencies |  |  |  |
Maximum commitment under Capital Support Agreement | 50 | 50 | 50 | $ 50
Ameriprise Financial, Inc: | Ameriprise Financial Services, Inc. [Member] |  |  |  |
Guarantees, Commitments and Contingencies |  |  |  |
Secured demand notes | 200 | 200 |  |
Ameriprise Financial, Inc: | Ameriprise Enterprise Investment Services Inc. [Member] |  |  |  |
Guarantees, Commitments and Contingencies |  |  |  |
Loans to subsidiaries | 60 | 60 |  |
Ameriprise Financial, Inc: | Asset-backed Securities, Securitized Loans and Receivables [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Residual tranche fair value | 90 | 90 | 94 |
Ameriprise Financial, Inc: | Net investment income [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 6 |  |
Ameriprise Financial, Inc: | Federal Home Loan Bank advances [Member] |  |  |  |
Debt |  |  |  |
Short-term borrowings | $ 200 | $ 200 | $ 201 |

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