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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events Declaration of Quarterly Dividend Payment On April 14, 2017, the Ally Board of Directors declared a quarterly cash dividend payment of $0.08 per share on all common stock. The dividend is payable on May 15, 2017, to shareholders of record at the close of business on May 1, 2017.