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Debt (Narrative) (Details 2) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 28, 2019
Debt and stated interest rates |  |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 313 | $ 13 | $ 11 |
Ameriprise Financial [Member] | Repurchase agreements [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Remaining maturity of outstanding amount for short term borrowings |  |  |  | 3 months |  |
Ameriprise Financial [Member] | Repurchase agreements [Member] | Residential mortgage backed securities [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Securities pledged as collateral |  |  |  | $ 52 |  |
Ameriprise Financial [Member] | Federal Home Loan Bank advances [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Remaining maturity of outstanding amount for short term borrowings |  |  | 2 months | 3 months |  |
Ameriprise Financial [Member] | Federal Home Loan Bank advances [Member] | Residential mortgage backed securities [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Securities pledged as collateral |  |  | $ 184 | $ 0 |  |
Ameriprise Financial [Member] | Federal Home Loan Bank advances [Member] | Commercial mortgage backed securities [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Securities pledged as collateral |  |  | $ 905 | $ 780 |  |
Ameriprise Financial [Member] | Senior notes due 2022 [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Unsecured senior notes issued |  | $ 500 |  |  |  |
Debt issuance costs |  | $ 3 |  |  |  |
Stated interest rate (as a percent) long-term debt |  |  | 3.00% |  |  |
Ameriprise Financial [Member] | Senior notes due 2019 [Member] |  |  |  |  |  |
Debt and stated interest rates |  |  |  |  |  |
Repayments of Long-term Debt | $ 300 |  |  |  |  |
Stated interest rate (as a percent) long-term debt |  |  |  | 7.30% |  | 7.30%

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