Business Segments (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of reportable business segments

As of and for the Twelve Months Ended December 31, 2015:

(Dollars in millions)	Regional Bank		U.S. Wholesale Banking		Transaction Banking		Investment Banking & Markets			Other			Reconciling Items			MUFG Americas Holdings Corporation
Results of operations—Market View
Net interest income (expense)	$	1,934	$	409	$	465	$	245		$	136		$	(374	)	$	2,815
Noninterest income (expense)	450		135		169		182			782			(188		)	1,530
Total revenue	2,384		544		634		427			918			(562		)	4,345
Noninterest expense	1,677		167		410		137			1,223			(176		)	3,438
(Reversal of) provision for credit losses	14		206		1		(22		)	31			(2		)	228
Income (loss) before income taxes and including noncontrolling interests	693		171		223		312			(336		)	(384		)	679
Income tax expense (benefit)	200		66		87		72			(123		)	(151		)	151
Net income (loss) including noncontrolling interest	493		105		136		240			(213		)	(233		)	528
Deduct: net loss from noncontrolling interests	—		—		—		—			45			—			45
Net income (loss) attributable to MUAH	$	493	$	105	$	136	$	240		$	(168	)	$	(233	)	$	573
Total assets, end of period	$	60,743	$	14,841	$	2,122	$	11,897		$	28,916		$	(2,313	)	$	116,206

As of and for the Twelve Months Ended December 31, 2014:

(Dollars in millions)	Regional Bank			U.S. Wholesale Banking			Transaction Banking			Investment Banking & Markets		Other			Reconciling Items			MUFG Americas Holdings Corporation
Results of operations—Market View
Net interest income (expense)	$	2,088		$	362		$	443		$	268	$	62		$	(361	)	$	2,862
Noninterest income (expense)	440			177			158			285		293			(230		)	1,123
Total revenue	2,528			539			601			553		355			(591		)	3,985
Noninterest expense	1,596			154			361			131		735			(154		)	2,823
(Reversal of) provision for credit losses	(2		)	(17		)	(3		)	38		(5		)	(5		)	6
Income (loss) before income taxes and including noncontrolling interests	934			402			243			384		(375		)	(432		)	1,156
Income tax expense (benefit)	305			158			95			104		(133		)	(170		)	359
Net income (loss) including noncontrolling interest	629			244			148			280		(242		)	(262		)	797
Deduct: net loss from noncontrolling interests	—			—			—			—		19			—			19
Net income (loss) attributable to MUAH	$	629		$	244		$	148		$	280	$	(223	)	$	(262	)	$	816
Total assets, end of period	$	62,234		$	12,985		$	1,780		$	10,892	$	27,961		$	(2,229	)	$	113,623

As of and for the Twelve Months Ended December 31, 2013:

(Dollars in millions)	Regional Bank			U.S. Wholesale Banking		Transaction Banking			Investment Banking & Markets		Other			Reconciling Items			MUFG Americas Holdings Corporation
Results of operations—Market View
Net interest income (expense)	$	1,981		$	316	$	447		$	268	$	33		$	(329	)	$	2,716
Noninterest income (expense)	471			161		161			229		64			(210		)	876
Total revenue	2,452			477		608			497		97			(539		)	3,592
Noninterest expense	1,662			127		357			120		570			(123		)	2,713
(Reversal of) provision for credit losses	(35		)	20		(3		)	1		(13		)	1			(29		)
Income (loss) before income taxes and including noncontrolling interests	825			330		254			376		(460		)	(417		)	908
Income tax expense (benefit)	271			130		100			112		(171		)	(163		)	279
Net income (loss) including noncontrolling interest	554			200		154			264		(289		)	(254		)	629
Deduct: net loss from noncontrolling interests	—			—		—			—		18			—			18
Net income (loss) attributable to MUAH	$	554		$	200	$	154		$	264	$	(271	)	$	(254	)	$	647
Total assets, end of period	$	56,777		$	10,218	$	1,575		$	9,438	$	29,473		$	(1,632	)	$	105,849