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Debt Debt (Line of Credit Narrative) (Details 3) - Ameriprise Financial [Member]
$ in Millions
Dec. 31, 2020
USD ($)
Line of Credit Facility [Line Items]  
Current borrowing capacity under the line of credit $ 750
Maximum borrowing capacity under the line of credit 1,000
Borrowings outstanding under credit facility 0
Outstanding letters of credit issued against credit facility $ 1