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Long-Term Debt summary of maturities for long-term debt (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt $ 16,686 $ 17,129
Parent Company [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 0  
Long-term debt 7,623 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 3,414  
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 1,726  
Long-term debt 8,508  
Long-term Debt, Maturities, Repayments of Principal after Year Five 513  
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 2,794  
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 173  
Long-term debt 555  
Long-term Debt, Maturities, Repayments of Principal after Year Five 29  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 137  
Long-term Debt, Maturities, Repayments of Principal in Year Three 40  
Long-term Debt, Maturities, Repayments of Principal in Year Two 176  
MUFG Americas Holding Corporation    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1,899  
Long-term debt 16,686  
Long-term Debt, Maturities, Repayments of Principal after Year Five 977  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal in Year Four 5,101  
Long-term Debt, Maturities, Repayments of Principal in Year Three 6,608  
Long-term Debt, Maturities, Repayments of Principal in Year Two 2,101  
Floating Rate debt due March 2022 [Member] | 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 8,508 8,909
MUFG Union Bank N.A | Fixed Rate 3.15 Percent Notes Due April 2022 [Member] | 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 [Member] | Senior debt obligations    
Debt Instrument [Line Items]    
Debt instrument, fixed interest rate (as a percent) 1.60% 2.49%