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Long-Term Debt (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument        
Long-term debt     $ 10,556,000,000 $ 11,410,000,000
Parent Company        
Debt Instrument        
Long-term debt     6,994,000,000 3,470,000,000
Parent Company | Senior Debt Obligations | Floating rate senior notes due February 2018. These notes, which bear interest at 0.57% above 3-month LIBOR, had a rate of 1.75% at June 30, 2017 and 1.46% at December 31, 2016        
Debt Instrument        
Long-term debt     $ 250,000,000 $ 250,000,000
Long-term debt, weighted average interest rate (as a percent)     1.75% 1.46%
Parent Company | Senior Debt Obligations | Floating rate senior notes due February 2018. These notes, which bear interest at 0.57% above 3-month LIBOR, had a rate of 1.75% at June 30, 2017 and 1.46% at December 31, 2016 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)     0.57% 0.57%
Parent Company | Senior Debt Obligations | Fixed rate 1.625% notes due February 2018        
Debt Instrument        
Long-term debt     $ 450,000,000 $ 449,000,000
Debt instrument, fixed interest rate (as a percent)     1.625% 1.625%
Parent Company | Senior Debt Obligations | Fixed rate 2.25% notes due February 2020        
Debt Instrument        
Long-term debt     $ 997,000,000 $ 997,000,000
Debt instrument, fixed interest rate (as a percent)     2.25% 2.25%
Parent Company | Senior Debt Obligations | Fixed rate 3.50% notes due June 2022        
Debt Instrument        
Long-term debt     $ 397,000,000 $ 397,000,000
Debt instrument, fixed interest rate (as a percent)     3.50% 3.50%
Parent Company | Senior Debt Obligations | Fixed rate 3.00% notes due February 2025        
Debt Instrument        
Long-term debt     $ 496,000,000 $ 496,000,000
Debt instrument, fixed interest rate (as a percent)     3.00% 3.00%
Parent Company | Senior Debt Obligations | Floating rate debt due September 2020. This note, which bears interest at 0.85% above 3-month LIBOR, had a rate of 2.15% at June 30, 2017        
Debt Instrument        
Long-term debt     $ 3,500,000,000 $ 0
Amount borrowed   $ 3,500,000,000    
Prepayment of long term debt     $ 500,000  
Long-term debt, weighted average interest rate (as a percent)     2.15%  
Parent Company | Senior Debt Obligations | Floating rate debt due September 2020. This note, which bears interest at 0.85% above 3-month LIBOR, had a rate of 2.15% at June 30, 2017 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)     0.85%  
Parent Company | Senior Debt Obligations | Floating rate debt due December 2023. This note, which bears interest at 0.76% above 3-month EURIBOR, had a rate of 0.76% at June 30, 2017        
Debt Instrument        
Long-term debt     $ 23,000,000 0
Long-term debt, weighted average interest rate (as a percent)     0.76%  
Parent Company | Senior Debt Obligations | Floating rate debt due December 2023. This note, which bears interest at 0.76% above 3-month EURIBOR, had a rate of 0.76% at June 30, 2017 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)     0.76%  
Parent Company | Senior Debt Obligations | Floating rate debt due March 2020. This note, which bears interest at 0.86% above 3-month LIBOR, had a rate of 2.11% at June 30, 2017 and 1.82% at December 31, 2016        
Debt Instrument        
Long-term debt     $ 545,000,000 $ 545,000,000
Long-term debt, weighted average interest rate (as a percent)     2.11% 1.82%
Parent Company | Senior Debt Obligations | Floating rate debt due March 2020. This note, which bears interest at 0.86% above 3-month LIBOR, had a rate of 2.11% at June 30, 2017 and 1.82% at December 31, 2016 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)     0.86%  
Parent Company | Subordinated Debt | Floating rate subordinated debt due December 2023. This note, which bears interest at 1.38% above 3-month LIBOR, had a rate of 2.67% at June 30, 2017 and 2.38% at December 31, 2016        
Debt Instrument        
Long-term debt     $ 300,000,000 $ 300,000,000
Long-term debt, weighted average interest rate (as a percent)     2.67% 2.38%
Parent Company | Subordinated Debt | Floating rate subordinated debt due December 2023. This note, which bears interest at 1.38% above 3-month LIBOR, had a rate of 2.67% at June 30, 2017 and 2.38% at December 31, 2016 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)     1.38%  
Parent Company | Junior subordinated debt payable to trusts | Floating rate note due September 2036. This note had an interest rate of 2.94% at June 30, 2017 and 2.66% at December 31, 2016        
Debt Instrument        
Long-term debt     $ 36,000,000 $ 36,000,000
Long-term debt, weighted average interest rate (as a percent)     2.94% 2.66%
MUFG Union Bank N.A        
Debt Instrument        
Long-term debt     $ 2,307,000,000 $ 6,557,000,000
MUFG Union Bank N.A | Senior Debt Obligations | Floating rate debt due September 2020. This note, which bears interest at 0.85% above 3-month LIBOR, had a rate of 2.15% at June 30, 2017 | MUFG Americas Holding Corporation        
Debt Instrument        
Repayments of debt $ 3,500,000,000      
MUFG Union Bank N.A | Senior Debt Obligations | Floating rate notes due May 2017. These notes, which bear interest at 0.40% above 3-month LIBOR, had a rate of 1.28% at December 31, 2016        
Debt Instrument        
Long-term debt     $ 0 $ 250,000,000
Long-term debt, weighted average interest rate (as a percent)       1.28%
MUFG Union Bank N.A | Senior Debt Obligations | Floating rate notes due May 2017. These notes, which bear interest at 0.40% above 3-month LIBOR, had a rate of 1.28% at December 31, 2016 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)     0.40%  
MUFG Union Bank N.A | Senior Debt Obligations | Fixed rate 2.125% notes due June 2017        
Debt Instrument        
Long-term debt     $ 0 $ 500,000,000
Debt instrument, fixed interest rate (as a percent)       2.125%
MUFG Union Bank N.A | Senior Debt Obligations | Fixed rate 2.625% notes due September 2018        
Debt Instrument        
Long-term debt     $ 999,000,000 $ 999,000,000
Debt instrument, fixed interest rate (as a percent)     2.625% 2.625%
MUFG Union Bank N.A | Senior Debt Obligations | Fixed rate 2.250% notes due May 2019        
Debt Instrument        
Long-term debt     $ 500,000,000 $ 500,000,000
Debt instrument, fixed interest rate (as a percent)     2.25% 2.25%
MUFG Union Bank N.A | Senior Debt Obligations | Floating rate debt due January 2018. This note, which bears interest at 0.85% above 1-month LIBOR, had a rate of 1.47% at December 31, 2016        
Debt Instrument        
Long-term debt     $ 0 $ 1,000,000,000
Long-term debt, weighted average interest rate (as a percent)       1.47%
MUFG Union Bank N.A | Senior Debt Obligations | Floating rate debt due January 2018. This note, which bears interest at 0.85% above 1-month LIBOR, had a rate of 1.47% at December 31, 2016 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)     0.85%  
MUFG Union Bank N.A | Senior Debt Obligations | Floating rate debt due January 2018. This note, which bears interest at 0.87% above 1-month LIBOR, had a rate of 1.49% at December 31, 2016        
Debt Instrument        
Long-term debt     $ 0 $ 1,500,000,000
Long-term debt, weighted average interest rate (as a percent)       1.49%
MUFG Union Bank N.A | Senior Debt Obligations | Floating rate debt due January 2018. This note, which bears interest at 0.87% above 1-month LIBOR, had a rate of 1.49% at December 31, 2016 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)       0.87%
MUFG Union Bank N.A | Senior Debt Obligations | Floating rate debt due January 2018. This note, which bears interest at 1.03% above 1-month LIBOR, had a rate of 1.65% at December 31, 2016        
Debt Instrument        
Long-term debt     0 $ 1,000,000,000
Long-term debt, weighted average interest rate (as a percent)       1.65%
MUFG Union Bank N.A | Senior Debt Obligations | Floating rate debt due January 2018. This note, which bears interest at 1.03% above 1-month LIBOR, had a rate of 1.65% at December 31, 2016 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)       1.03%
MUFG Union Bank N.A | Subordinated Debt | Floating rate subordinated debt due June 2023. This note, which bears interest at 1.20% above 3-month LIBOR, had a rate of 2.49% at June 30, 2017 and 2.20% at December 31, 2016        
Debt Instrument        
Long-term debt     $ 750,000,000 $ 750,000,000
Long-term debt, weighted average interest rate (as a percent)     2.49% 2.20%
MUFG Union Bank N.A | Subordinated Debt | Floating rate subordinated debt due June 2023. This note, which bears interest at 1.20% above 3-month LIBOR, had a rate of 2.49% at June 30, 2017 and 2.20% at December 31, 2016 | London Interbank Offered Rate LIBOR        
Debt Instrument        
Interest rate above variable interest rate (as a percent)     1.20% 1.20%
MUFG Union Bank N.A | Other debt securities, Other        
Debt Instrument        
Long-term debt     $ 58,000,000 $ 58,000,000
Other Subsidiaries, Excluding MUFG Bank, NA        
Debt Instrument        
Long-term debt     1,255,000,000 1,383,000,000
Other Subsidiaries, Excluding MUFG Bank, NA | Senior Debt Obligations | Various floating rate borrowings due between November 2020 and April 2021. These notes, which bear interest above 3-month LIBOR had a weighted-average interest rate of 1.30% at June 30, 2017 and 0.99% at December 31, 2016        
Debt Instrument        
Long-term debt     $ 250,000,000 $ 250,000,000
Long-term debt, weighted average interest rate (as a percent)     1.30% 0.99%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior Debt Obligations | Various fixed rate borrowings due between September 2019 and May 2023 with a weighted-average interest rate of 2.11% (between 1.71% and 2.44%) at June 30, 2017 and 2.15% (between 1.71% and 2.44%) at December 31, 2016        
Debt Instrument        
Long-term debt     $ 267,000,000 $ 384,000,000
Long-term debt, weighted average interest rate (as a percent)     2.11% 2.15%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior Debt Obligations | Various fixed rate borrowings due between September 2019 and May 2023 with a weighted-average interest rate of 2.11% (between 1.71% and 2.44%) at June 30, 2017 and 2.15% (between 1.71% and 2.44%) at December 31, 2016 | Minimum        
Debt Instrument        
Long-term debt, weighted average interest rate (as a percent)     1.71% 1.71%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior Debt Obligations | Various fixed rate borrowings due between September 2019 and May 2023 with a weighted-average interest rate of 2.11% (between 1.71% and 2.44%) at June 30, 2017 and 2.15% (between 1.71% and 2.44%) at December 31, 2016 | Maximum        
Debt Instrument        
Long-term debt, weighted average interest rate (as a percent)     2.44% 2.44%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior Debt Obligations | Various floating rate borrowings due between March 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had a weighted-average interest rate of 2.86% (between 2.80% and 2.95%) at June 30, 2017 and 2.68% (between 2.61% and 2.77%) at December 31, 2016        
Debt Instrument        
Long-term debt, weighted average interest rate (as a percent)     2.86% 2.68%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior Debt Obligations | Various floating rate borrowings due between March 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had a weighted-average interest rate of 2.86% (between 2.80% and 2.95%) at June 30, 2017 and 2.68% (between 2.61% and 2.77%) at December 31, 2016 | Minimum        
Debt Instrument        
Long-term debt, weighted average interest rate (as a percent)     2.80% 2.61%
Other Subsidiaries, Excluding MUFG Bank, NA | Senior Debt Obligations | Various floating rate borrowings due between March 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had a weighted-average interest rate of 2.86% (between 2.80% and 2.95%) at June 30, 2017 and 2.68% (between 2.61% and 2.77%) at December 31, 2016 | Maximum        
Debt Instrument        
Long-term debt, weighted average interest rate (as a percent)     2.95% 2.77%
Other Subsidiaries, Excluding MUFG Bank, NA | Subordinated Debt | Various floating rate borrowings due between March 2018 and March 2019. These notes, which bear interest above 6-month LIBOR had a weighted-average interest rate of 2.86% (between 2.80% and 2.95%) at June 30, 2017 and 2.68% (between 2.61% and 2.77%) at December 31, 2016        
Debt Instrument        
Long-term debt     $ 185,000,000 $ 185,000,000
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate nonrecourse borrowings due to BTMU between June 2017 and December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted-average interest rate of 2.44% (between 1.47% and 2.88%) at June 30, 2017 and 1.67% (between 0.25% and 2.41%) at December 31, 2016        
Debt Instrument        
Long-term debt     $ 125,000,000 $ 127,000,000
Long-term debt, weighted average interest rate (as a percent)     2.44% 1.67%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate nonrecourse borrowings due to BTMU between June 2017 and December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted-average interest rate of 2.44% (between 1.47% and 2.88%) at June 30, 2017 and 1.67% (between 0.25% and 2.41%) at December 31, 2016 | Minimum        
Debt Instrument        
Long-term debt, weighted average interest rate (as a percent)     1.47% 0.25%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate nonrecourse borrowings due to BTMU between June 2017 and December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted-average interest rate of 2.44% (between 1.47% and 2.88%) at June 30, 2017 and 1.67% (between 0.25% and 2.41%) at December 31, 2016 | Maximum        
Debt Instrument        
Long-term debt, weighted average interest rate (as a percent)     2.88% 2.41%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Fixed rate nonrecourse borrowings due December 2026 which had an interest rate of 5.34% at June 30, 2017 and December 31, 2016        
Debt Instrument        
Long-term debt     $ 38,000,000 $ 39,000,000
Long-term debt, weighted average interest rate (as a percent)     5.34% 5.34%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate nonrecourse borrowings due between July 2017 and May 2019. These notes, which bear interest above 1- or 3-month LIBOR had a weighted-average interest rate of 2.41% (between 2.08% and 3.16%) at June 30, 2017 and 2.04% (between 0.85% and 2.73%) at December 31, 2016        
Debt Instrument        
Long-term debt     $ 390,000,000 $ 398,000,000
Long-term debt, weighted average interest rate (as a percent)     2.41% 2.04%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate nonrecourse borrowings due between July 2017 and May 2019. These notes, which bear interest above 1- or 3-month LIBOR had a weighted-average interest rate of 2.41% (between 2.08% and 3.16%) at June 30, 2017 and 2.04% (between 0.85% and 2.73%) at December 31, 2016 | Minimum        
Debt Instrument        
Long-term debt, weighted average interest rate (as a percent)     2.08% 0.85%
Other Subsidiaries, Excluding MUFG Bank, NA | Secured Debt | Various floating rate nonrecourse borrowings due between July 2017 and May 2019. These notes, which bear interest above 1- or 3-month LIBOR had a weighted-average interest rate of 2.41% (between 2.08% and 3.16%) at June 30, 2017 and 2.04% (between 0.85% and 2.73%) at December 31, 2016 | Maximum        
Debt Instrument        
Long-term debt, weighted average interest rate (as a percent)     3.16% 2.73%