Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Summary of Long-Term Debt

Long-term debt consists of borrowings having an original maturity of one year or more. The following is a summary of the Company's long-term debt:

(Dollars in millions)	December 31, 2016		December 31, 2015
Debt issued by MUAH
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	$	250	$	250
Fixed rate 1.625% notes due February 2018	449		450
Fixed rate 2.25% notes due February 2020	997		1,000
Fixed rate 3.50% notes due June 2022	397		398
Fixed rate 3.00% notes due February 2025	496		498
Senior debt due to BTMU:
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	545		—
Subordinated debt due to BTMU:
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	300		300
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	36		36
Total debt issued by MUAH	3,470		2,932
Debt issued by 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	—		500
Fixed rate 3.00% notes due June 2016	—		700
Fixed rate 1.50% notes due September 2016	—		499
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	—		500
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	250		250
Fixed rate 2.125% notes due June 2017	500		499
Fixed rate 2.625% notes due September 2018	999		1,000
Fixed rate 2.250% notes due May 2019	500		502
Senior debt to BTMU(3):
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	1,000		1,000
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	1,500		1,500
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	1,000		1,000
Subordinated debt:
Fixed rate 5.95% notes due May 2016	—		703
Subordinated debt due to BTMU:
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	750		750
Other	58		14
Total debt issued by MUB	6,557		9,417

Debt issued by other MUAH subsidiaries
Senior Debt due to BTMU:
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	250		—
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	384		452
Subordinated Debt due to Affiliate:
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	185		220
Nonrecourse Debt due to BTMU:
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	127		169
Nonrecourse 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	39		46
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	398		412
Total debt issued by other MUAH subsidiaries	1,383		1,299
Total long-term debt	$	11,410	$	13,648