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Debt Debt (Line of Credit Narrative) (Details 3) - Ameriprise Financial [Member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
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 $ 0
Outstanding letters of credit issued against credit facility $ 1 $ 1