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Line of Credit Narrative (Details 2) - Ameriprise Financial [Member] - USD ($)
$ in Millions
Jun. 30, 2020
Oct. 12, 2017
Line of Credit Facility    
Current borrowing capacity for line of credit facility   $ 750
Maximum borrowing capacity for line of credit facility   $ 1,000
Line of credit borrowings outstanding $ 0  
Outstanding letters of credit issued against line of credit facility $ 1