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Long-Term Debt summary of maturities for long-term debt (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt $ 14,145 $ 14,631
Parent Company [Member]    
Debt Instrument [Line Items]    
Long-term debt 7,329 7,276
Long-term Debt, Maturities, Repayments of Principal after Year Five 0  
Long-term Debt, Maturities, Repayments of Principal in Year Five 398  
Long-term Debt, Maturities, Repayments of Principal in Year Four 3,115  
Long-term Debt, Maturities, Repayments of Principal in Year Three 3,416  
Long-term Debt, Maturities, Repayments of Principal in Year Two 400  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 0  
MUFG Union Bank N.A    
Debt Instrument [Line Items]    
Long-term debt 6,384  
Long-term Debt, Maturities, Repayments of Principal after Year Five 2,058  
Long-term Debt, Maturities, Repayments of Principal in Year Five 601  
Long-term Debt, Maturities, Repayments of Principal in Year Four 1  
Long-term Debt, Maturities, Repayments of Principal in Year Three 1  
Long-term Debt, Maturities, Repayments of Principal in Year Two 2,298  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,425  
Other Subsidiaries, Excluding MUFG Bank, NA    
Debt Instrument [Line Items]    
Long-term debt 432  
Long-term Debt, Maturities, Repayments of Principal after Year Five 275  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 0  
Long-term Debt, Maturities, Repayments of Principal in Year Three 96  
Long-term Debt, Maturities, Repayments of Principal in Year Two 37  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 24  
MUFG Americas Holding Corporation    
Debt Instrument [Line Items]    
Long-term debt 14,145  
Long-term Debt, Maturities, Repayments of Principal after Year Five 2,333  
Long-term Debt, Maturities, Repayments of Principal in Year Five 999  
Long-term Debt, Maturities, Repayments of Principal in Year Four 3,116  
Long-term Debt, Maturities, Repayments of Principal in Year Three 3,513  
Long-term Debt, Maturities, Repayments of Principal in Year Two 2,735  
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,449  
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 6,384 6,884
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) 0.73% 0.83%