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Long-Term Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Feb. 02, 2015
Jan. 01, 2015
Debt Instrument          
Long-term debt   $ 11,410,000,000 $ 13,648,000,000    
Federal Home Loan advances, collateral pledged   $ 44,300,000,000 $ 57,100,000,000    
Senior debt | 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 and 1.09% at December 31, 2015          
Debt Instrument          
Debt instrument, effective interest rate   1.47% 1.09%    
Senior debt | 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 and 1.09% at December 31, 2015 | LIBOR          
Debt Instrument          
Interest rate above variable interest rate (as a percent)   0.85%      
Senior debt | 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 and 1.11% at December 31, 2015          
Debt Instrument          
Debt instrument, effective interest rate   1.49% 1.11%    
Senior debt | 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 and 1.11% at December 31, 2015 | LIBOR          
Debt Instrument          
Interest rate above variable interest rate (as a percent)   0.87%      
Senior debt | 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 and 1.27% at December 31, 2015          
Debt Instrument          
Debt instrument, effective interest rate   1.65% 1.27%    
Senior debt | 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 and 1.27% at December 31, 2015 | LIBOR          
Debt Instrument          
Interest rate above variable interest rate (as a percent)   1.03%      
Subordinated Debt | Fixed rate 5.95% notes due May 2016          
Debt Instrument          
Debt instrument, stated rate     5.95%    
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 2.20% at December 31, 2016 and 1.80% at December 31, 2015          
Debt Instrument          
Debt instrument, effective interest rate   2.20% 1.80%    
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 2.20% at December 31, 2016 and 1.80% at December 31, 2015 | LIBOR          
Debt Instrument          
Interest rate above variable interest rate (as a percent)   1.20%      
MUFG Americas Holdings Corporation          
Debt Instrument          
Long-term debt   $ 3,470,000,000 $ 2,932,000,000    
MUFG Americas Holdings Corporation | Senior debt          
Debt Instrument          
Long-term debt   $ 1,400,000,000   $ 2,200,000,000 $ 3,600,000,000
Redeemable debt, percentage of par value   100.00%      
MUFG Americas Holdings Corporation | Senior debt | Floating rate senior notes due February 2018. These notes, which bear interest at 0.57% above 3-month LIBOR, had a rate of 1.46% at December 31, 2016 and 0.91% at December 31, 2015          
Debt Instrument          
Long-term debt   $ 250,000,000 $ 250,000,000    
Debt instrument, effective interest rate   1.46% 0.91%    
MUFG Americas Holdings Corporation | Senior debt | Floating rate senior notes due February 2018. These notes, which bear interest at 0.57% above 3-month LIBOR, had a rate of 1.46% at December 31, 2016 and 0.91% at December 31, 2015 | LIBOR          
Debt Instrument          
Interest rate above variable interest rate (as a percent)   0.57%      
MUFG Americas Holdings Corporation | Senior debt | Fixed rate 1.625% notes due February 2018          
Debt Instrument          
Long-term debt   $ 449,000,000 $ 450,000,000    
Debt instrument, stated rate   1.625%      
MUFG Americas Holdings Corporation | Senior debt | Fixed rate 2.25% notes due February 2020          
Debt Instrument          
Long-term debt   $ 997,000,000 1,000,000,000    
Debt instrument, stated rate   2.25%      
MUFG Americas Holdings Corporation | Senior debt | Fixed rate 3.50% notes due June 2022          
Debt Instrument          
Long-term debt   $ 397,000,000 398,000,000    
Debt instrument, stated rate   3.50%      
MUFG Americas Holdings Corporation | Senior debt | Fixed rate 3.00% notes due February 2025          
Debt Instrument          
Long-term debt   $ 496,000,000 498,000,000    
Debt instrument, stated rate   3.00%      
MUFG Americas Holdings Corporation | Senior debt | Floating rate debt due March 2020. This note, which bears interest at 0.86% above 3-month LIBOR, had a rate of 1.82% at December 31, 2016          
Debt Instrument          
Long-term debt $ 545,000,000 $ 545,000,000 0    
Debt instrument, effective interest rate   1.82%      
Prepayment of long term debt $ 500,000        
MUFG Americas Holdings Corporation | Senior debt | Floating rate debt due March 2020. This note, which bears interest at 0.86% above 3-month LIBOR, had a rate of 1.82% at December 31, 2016 | LIBOR          
Debt Instrument          
Interest rate above variable interest rate (as a percent)   0.86%      
MUFG Americas Holdings Corporation | 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 2.38% at December 31, 2016 and 1.98% at December 31, 2015          
Debt Instrument          
Long-term debt   $ 300,000,000 $ 300,000,000    
Debt instrument, effective interest rate   2.38% 1.98%    
MUFG Americas Holdings Corporation | 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 2.38% at December 31, 2016 and 1.98% at December 31, 2015 | LIBOR          
Debt Instrument          
Interest rate above variable interest rate (as a percent)   1.38%      
MUFG Americas Holdings Corporation | Junior subordinated debt payable to trusts | Floating rate note due September 2036. This note had an interest rate of 2.66% at December 31, 2016 and 2.21% at December 31, 2015          
Debt Instrument          
Long-term debt   $ 36,000,000 $ 36,000,000    
Debt instrument, effective interest rate   2.66% 2.21%    
MUB          
Debt Instrument          
Long-term debt   $ 6,557,000,000 $ 9,417,000,000    
Amount available for issuance under the bank note program   5,900,000,000      
MUB | Minimum          
Debt Instrument          
Prepayment of long term debt   500,000      
MUB | Maximum          
Debt Instrument          
Amount available for issuance under the bank note program   $ 12,000,000,000      
MUB | Senior debt          
Debt Instrument          
Amount available for issuance under the Bank note program   1 year      
MUB | Senior debt | Fixed rate FHLB of San Francisco advances due February 2016. These notes had a combined weighted-average rate of 2.50% at December 31, 2015          
Debt Instrument          
Long-term debt   $ 0 $ 500,000,000    
Debt instrument, effective interest rate     2.50%    
MUB | Senior debt | Fixed rate 3.00% notes due June 2016          
Debt Instrument          
Long-term debt   $ 0 $ 700,000,000    
Debt instrument, stated rate   3.00%      
MUB | Senior debt | Fixed rate 1.50% notes due September 2016          
Debt Instrument          
Long-term debt   $ 0 499,000,000    
Debt instrument, stated rate   1.50%      
MUB | Senior debt | Floating rate notes due September 2016. These notes, which bear interest at 0.75% above 3-month LIBOR, had a rate of 1.35% at December 31, 2015          
Debt Instrument          
Long-term debt   $ 0 $ 500,000,000    
Debt instrument, effective interest rate     1.35%    
MUB | Senior debt | Floating rate notes due September 2016. These notes, which bear interest at 0.75% above 3-month LIBOR, had a rate of 1.35% at December 31, 2015 | LIBOR          
Debt Instrument          
Interest rate above variable interest rate (as a percent)   0.75%      
MUB | Senior debt | 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 and 0.73% at December 31, 2015          
Debt Instrument          
Long-term debt   $ 250,000,000 $ 250,000,000    
Debt instrument, effective interest rate   0.73% 0.63%    
MUB | Senior debt | 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 and 0.73% at December 31, 2015 | LIBOR          
Debt Instrument          
Interest rate above variable interest rate (as a percent)   0.40%      
MUB | Senior debt | Fixed rate 2.125% notes due June 2017          
Debt Instrument          
Long-term debt   $ 500,000,000 $ 499,000,000    
Debt instrument, stated rate   2.125%      
MUB | Senior debt | Fixed rate 2.625% notes due September 2018          
Debt Instrument          
Long-term debt   $ 999,000,000 1,000,000,000    
Debt instrument, stated rate   2.625%      
MUB | Senior debt | Fixed rate 2.250% notes due May 2019          
Debt Instrument          
Long-term debt   $ 500,000,000 502,000,000    
Debt instrument, stated rate   2.25%      
MUB | Senior debt | 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 and 1.09% at December 31, 2015          
Debt Instrument          
Long-term debt   $ 1,000,000,000 1,000,000,000    
MUB | Senior debt | 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 and 1.11% at December 31, 2015          
Debt Instrument          
Long-term debt   1,500,000,000 1,500,000,000    
MUB | Senior debt | 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 and 1.27% at December 31, 2015          
Debt Instrument          
Long-term debt   $ 1,000,000,000 1,000,000,000    
MUB | Subordinated Debt          
Debt Instrument          
Amount available for issuance under the Bank note program   5 years      
MUB | Subordinated Debt | Fixed rate 5.95% notes due May 2016          
Debt Instrument          
Long-term debt   $ 0 703,000,000    
MUB | 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 2.20% at December 31, 2016 and 1.80% at December 31, 2015          
Debt Instrument          
Long-term debt   750,000,000 750,000,000    
MUB | Other          
Debt Instrument          
Long-term debt   58,000,000 14,000,000    
Other MUAH Subsidiaries          
Debt Instrument          
Long-term debt   1,383,000,000 1,299,000,000    
Other MUAH Subsidiaries | Senior debt | 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 0.99% at December 31, 2016          
Debt Instrument          
Long-term debt   $ 250,000,000 0    
Debt instrument, effective interest rate   0.99%      
Other MUAH Subsidiaries | Senior debt | Various fixed rate borrowings due between September 2019 and May 2023 with a weighted-average interest rate of 2.15% (between 1.71% and 2.44%) at December 31, 2016 and 2.10% (between 1.71% and 2.44%) at December 31, 2015          
Debt Instrument          
Long-term debt   $ 384,000,000 $ 452,000,000    
Debt instrument, effective interest rate   2.15% 2.10%    
Other MUAH Subsidiaries | Senior debt | Various fixed rate borrowings due between September 2019 and May 2023 with a weighted-average interest rate of 2.15% (between 1.71% and 2.44%) at December 31, 2016 and 2.10% (between 1.71% and 2.44%) at December 31, 2015 | Minimum          
Debt Instrument          
Debt instrument, effective interest rate   1.71% 1.71%    
Other MUAH Subsidiaries | Senior debt | Various fixed rate borrowings due between September 2019 and May 2023 with a weighted-average interest rate of 2.15% (between 1.71% and 2.44%) at December 31, 2016 and 2.10% (between 1.71% and 2.44%) at December 31, 2015 | Maximum          
Debt Instrument          
Debt instrument, effective interest rate   2.44% 2.44%    
Other MUAH Subsidiaries | 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 2.68% (between 2.61% and 2.77%) at December 31, 2016 and 1.91% (between 1.59% and 1.99%) at December 31, 2015          
Debt Instrument          
Long-term debt   $ 185,000,000 $ 220,000,000    
Debt instrument, effective interest rate   2.68%      
Other MUAH Subsidiaries | 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 2.68% (between 2.61% and 2.77%) at December 31, 2016 and 1.91% (between 1.59% and 1.99%) at December 31, 2015 | Minimum          
Debt Instrument          
Debt instrument, effective interest rate   2.61%      
Other MUAH Subsidiaries | 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 2.68% (between 2.61% and 2.77%) at December 31, 2016 and 1.91% (between 1.59% and 1.99%) at December 31, 2015 | Maximum          
Debt Instrument          
Debt instrument, effective interest rate   2.77%      
Other MUAH Subsidiaries | 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 1.67% (between 0.25% and 2.41%) at December 31, 2016 and 1.72% (between 0.68% and 2.08%) at December 31, 2015          
Debt Instrument          
Long-term debt   $ 127,000,000 $ 169,000,000    
Debt instrument, effective interest rate   1.67% 1.72%    
Other MUAH Subsidiaries | 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 1.67% (between 0.25% and 2.41%) at December 31, 2016 and 1.72% (between 0.68% and 2.08%) at December 31, 2015 | Minimum          
Debt Instrument          
Debt instrument, effective interest rate   0.25% 0.68%    
Other MUAH Subsidiaries | 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 1.67% (between 0.25% and 2.41%) at December 31, 2016 and 1.72% (between 0.68% and 2.08%) at December 31, 2015 | Maximum          
Debt Instrument          
Debt instrument, effective interest rate   2.41% 2.08%    
Other MUAH Subsidiaries | Secured Debt | Fixed rate nonrecourse borrowings due December 2026 which had an interest rate of 5.34% at December 31, 2016 and a weighted average interest rate of 5.65% (between 5.34% and 8.67%) at December 31, 2015          
Debt Instrument          
Long-term debt   $ 39,000,000 $ 46,000,000    
Debt instrument, effective interest rate   5.34% 5.65%    
Other MUAH Subsidiaries | Secured Debt | Fixed rate nonrecourse borrowings due December 2026 which had an interest rate of 5.34% at December 31, 2016 and a weighted average interest rate of 5.65% (between 5.34% and 8.67%) at December 31, 2015 | Minimum          
Debt Instrument          
Debt instrument, effective interest rate     5.34%    
Other MUAH Subsidiaries | Secured Debt | Fixed rate nonrecourse borrowings due December 2026 which had an interest rate of 5.34% at December 31, 2016 and a weighted average interest rate of 5.65% (between 5.34% and 8.67%) at December 31, 2015 | Maximum          
Debt Instrument          
Debt instrument, effective interest rate     8.67%    
Other MUAH Subsidiaries | 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 2.04% (between 0.85% and 2.73%) at December 31, 2016 and 1.82% (between 1.46% and 2.53%) at December 31, 2015          
Debt Instrument          
Long-term debt   $ 398,000,000 $ 412,000,000    
Debt instrument, effective interest rate   2.04% 1.82%    
Other MUAH Subsidiaries | 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 2.04% (between 0.85% and 2.73%) at December 31, 2016 and 1.82% (between 1.46% and 2.53%) at December 31, 2015 | Minimum          
Debt Instrument          
Debt instrument, effective interest rate   0.85% 1.46%    
Other MUAH Subsidiaries | 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 2.04% (between 0.85% and 2.73%) at December 31, 2016 and 1.82% (between 1.46% and 2.53%) at December 31, 2015 | Maximum          
Debt Instrument          
Debt instrument, effective interest rate   2.73% 2.53%