Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Summary of Long-Term Debt

(Dollars in millions)	December 31, 2019		December 31, 2018
Debt issued by MUAH
Senior debt:
Fixed rate 3.50% notes due June 2022	$	399	$	398
Fixed rate 3.00% notes due February 2025	397		397
Senior debt due to MUFG Bank, Ltd:
Floating rate debt due December 2021. This note, which bore interest at 0.81% above 3-month LIBOR, had a rate of 3.58% at December 31, 2018	—		1,625
Floating rate debt due December 2022. This note, which bears interest at 0.90% above 3-month LIBOR, had a rate of 3.03% at December 31, 2019 and 3.67% at December 31, 2018	3,250		3,250
Floating rate debt due December 2022. This note, which bears interest at 0.97% above 3-month LIBOR, had a rate of 3.07% at December 31, 2019	125		—
Floating rate debt due December 2023. This note, which bears interest at 0.99% above 3-month LIBOR, had a rate of 3.12% at December 31, 2019 and 3.76% at December 31, 2018	1,625		1,625
Floating rate debt due December 2023. This note, which bears interest at 0.94% above 3-month LIBOR, had a rate of 2.82% at December 31, 2019	1,765		—
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 December 31, 2019 and December 31, 2018	24		24
Junior subordinated debt payable to trusts:
Floating rate note due September 2036. This note had an interest rate of 3.59% at December 31, 2019 and 4.49% at December 31, 2018	37		36
Total debt issued by MUAH	7,622		7,355
Debt issued by MUB
Senior debt:
Fixed rate 2.10% notes due December 2022.	698		—
Floating rate debt due December 2022. These notes which bear interest at 0.71% above the Secured Overnight Financing Rate had a rate of 2.26% at December 31, 2019	300		—
Floating rate debt due March 2022. This note, which bears interest at 0.60% above 3-month LIBOR, had a rate of 2.49% at December 31, 2019	300		—
Variable rate FHLB of San Francisco advances due November 2020. These notes bear a combined weighted average rate of 1.90% at December 31, 2019	1,100		—
Fixed rate 2.25% notes due May 2019	—		498
Fixed rate 3.15% notes due April 2022	998		—
Fixed rate FHLB of San Francisco advances due between February 2020 and December 2023. These notes bear a combined weighted average rate of 2.95% at December 31, 2019 and 2.66% at December 31, 2018	5,500		9,100
Other	13		34
Total debt issued by MUB	8,909		9,632
Debt issued by other MUAH subsidiaries
Senior debt due to MUFG Bank, Ltd:
Various floating rate borrowings due between December 2020 and May 2021. These notes, which bear interest above 3-month LIBOR had a weighted average interest rate of 1.94% at December 31, 2019 and 2.80% at December 31, 2018	250		250
Various fixed rate borrowings due between January 2020 and June 2023 with a weighted average interest rate of 2.22% (between1.68% and 2.44%) at December 31, 2019 and 1.82% (between 0.14% and 2.44%) at December 31, 2018	137		244
Subordinated debt due to Affiliate:
Floating rate borrowings due March 2019. These notes, which bore interest above 6-month LIBOR had an interest rate of 4.13% at December 31, 2018	—		75
Non-recourse debt due to MUFG Bank, Ltd:
Various floating rate non-recourse borrowings due December 2021. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 2.17% at December 31, 2019 and 4.09% (between 2.75% and 4.17%) at December 31, 2018	3		53
Fixed rate non-recourse borrowings due between March 2020 and July 2023 which had an interest rate of 3.07% (between 1.96% and 3.72%) at December 31, 2019 and 3.05% at December 31, 2018	166		187
Other non-recourse debt:
Various floating rate non-recourse borrowings due December 2023. These notes, which bear interest above 1- or 3-month LIBOR had a weighted average interest rate of 3.93% at December 31, 2019 and 4.21% (between 4.17% and 4.48%) at December 31, 2018	13		89
Fixed rate non-recourse borrowings due December 2026 which had an interest rate of 5.34% at December 31, 2019 and December 31, 2018	29		33
Total debt issued by other MUAH subsidiaries	598		931
Total long-term debt	$	17,129	$	17,918