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Long-Term Debt summary of maturities for long-term debt (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt $ 15,150 $ 17,129
Parent Company [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 0  
Long-term debt 7,625 7,622
Long-term Debt, Maturities, Repayments of Principal after Year Five 435  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 3,416  
Long-term Debt, Maturities, Repayments of Principal in Year Three 3,774  
Long-term Debt, Maturities, Repayments of Principal in Year Two 0  
MUFG Union Bank N.A    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 100  
Long-term debt 6,984  
Long-term Debt, Maturities, Repayments of Principal after Year Five 614  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 1,550  
Long-term Debt, Maturities, Repayments of Principal in Year Three 2,795  
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,925  
Other Subsidiaries, Excluding MUFG Bank, NA    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 29  
Long-term debt 541  
Long-term Debt, Maturities, Repayments of Principal after Year Five 277  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 146  
Long-term Debt, Maturities, Repayments of Principal in Year Three 38  
Long-term Debt, Maturities, Repayments of Principal in Year Two 51  
MUFG Americas Holding Corporation    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 129  
Long-term debt 15,150  
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,326  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 5,112  
Long-term Debt, Maturities, Repayments of Principal in Year Three 6,607  
Long-term Debt, Maturities, Repayments of Principal in Year Two 1,976  
Floating Rate debt due March 2022 | Senior debt obligations | MUFG Union Bank N.A    
Debt Instrument [Line Items]    
Long-term debt 300 300
MUFG Union Bank N.A    
Debt Instrument [Line Items]    
Long-term debt 6,984 8,909
MUFG Union Bank N.A | Fixed Rate 3.15 Percent Notes Due April 2022 | Senior debt obligations    
Debt Instrument [Line Items]    
Long-term debt $ 998 $ 998
Debt instrument, fixed interest rate (as a percent) 3.15% 3.15%
MUFG Union Bank N.A | Floating Rate debt due March 2022 | Senior debt obligations    
Debt Instrument [Line Items]    
Debt instrument, fixed interest rate (as a percent) 0.85% 2.49%