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Line of Credit Narrative (Details 2) - Ameriprise Financial [Member] - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Line of Credit Facility    
Current borrowing capacity for line of credit facility $ 500  
Maximum borrowing capacity for line of credit facility 750  
Line of credit borrowings outstanding 0 $ 0
Outstanding letters of credit issued against line of credit facility $ 1 $ 1