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Equity Method Investments (Narratives) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Equity Method Investments            
Income (loss) from equity method investments $ 35 $ 32     $ 118 $ 108
MUMSS            
Equity Method Investments            
Income (loss) from equity method investments $ 54 $ 55     $ 194 $ 146
Dividends declared and paid by Joint Venture     $ 291 $ 594    
Dividends received from equity method investment     $ 116 $ 238    
Voting interest in joint venture 40.00%       40.00%  
MUMSS | MUFG            
Equity Method Investments            
Voting interest held by noncontrolling interest 60.00%       60.00%