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Debt - Short-term Borrowings (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Federal Home Loan Bank borrowings | Ameriprise Bank, FSB
Short-term borrowings
Short-term borrowings	$ 0	$ 0
Federal Home Loan Bank borrowings | Maximum | RiverSource Life Insurance Company
Short-term borrowings
Term, less than	3 months	3 months
Federal Home Loan Bank borrowings | Commercial and Residential mortgage backed securities | RiverSource Life Insurance Company
Short-term borrowings
FHLB advances, securities pledged as collateral	$ 1,100	$ 964
Federal Reserve borrowings | Ameriprise Bank, FSB
Short-term borrowings
Short-term borrowings	$ 0	$ 0

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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- Definition

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