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Line of Credit Narrative (Details 2) - Ameriprise Financial [Member] - USD ($)
$ in Millions
Oct. 12, 2017
Sep. 30, 2017
Dec. 31, 2016
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 $ 0
Outstanding letters of credit issued against line of credit facility   $ 1 $ 1