Business Segments (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Schedule of reportable business segments

(Dollars in millions)	Regional Bank		U.S. Wholesale Banking		Transaction Banking		Investment Banking & Markets		MUSA		Other			MUFG Americas Holdings Corporation
Results of operations - Market View
Net interest income (expense)	$	1,923	$	417	$	486	$	213	$	164	$	(150	)	$	3,053
Noninterest income (expense)	469		285		167		349		302		653			2,225
Total revenue	2,392		702		653		562		466		503			5,278
Noninterest expense	1,750		199		461		223		362		787			3,782
(Reversal of) provision for credit losses	30		50		—		53		—		22			155
Income (loss) before income taxes and including noncontrolling interests	612		453		192		286		104		(306		)	1,341
Income tax expense (benefit)	172		178		75		22		42		(70		)	419
Net income (loss) including noncontrolling interest	440		275		117		264		62		(236		)	922
Deduct: net loss from noncontrolling interests	—		—		—		1		—		67			68
Net income (loss) attributable to MUAH	$	440	$	275	$	117	$	265	$	62	$	(169	)	$	990
Total assets, end of period	$	63,291	$	12,164	$	2,036	$	13,851	$	29,252	$	27,550		$	148,144

As of and for the Year Ended December 31, 2015:

(Dollars in millions)	Regional Bank		U.S. Wholesale Banking		Transaction Banking		Investment Banking & Markets			MUSA		Other			MUFG Americas Holdings Corporation
Results of operations—Market View
Net interest income (expense)	$	1,896	$	418	$	441	$	249		$	72	$	(184	)	$	2,892
Noninterest income (expense)	451		135		169		294			300		501			1,850
Total revenue	2,347		553		610		543			372		317			4,742
Noninterest expense	1,839		211		437		243			315		702			3,747
(Reversal of) provision for credit losses	13		206		1		(22		)	—		29			227
Income (loss) before income taxes and including noncontrolling interests	495		136		172		322			57		(414		)	768
Income tax expense (benefit)	123		54		67		59			22		(156		)	169
Net income (loss) including noncontrolling interest	372		82		105		263			35		(258		)	599
Deduct: net loss from noncontrolling interests	—		—		—		—			—		45			45
Net income (loss) attributable to MUAH	$	372	$	82	$	105	$	263		$	35	$	(213	)	$	644
Total assets, end of period	$	60,767	$	15,064	$	2,121	$	14,445		$	34,167	$	26,506		$	153,070

As of and for the Year Ended December 31, 2014:

(Dollars in millions)	Regional Bank		U.S. Wholesale Banking			Transaction Banking			Investment Banking & Markets		MUSA		Other			MUFG Americas Holdings Corporation
Results of operations—Market View
Net interest income (expense)	$	2,057	$	368		$	423		$	250	$	55	$	(248	)	$	2,905
Noninterest income (expense)	431		186			158			461		255		(21		)	1,470
Total revenue	2,488		554			581			711		310		(269		)	4,375
Noninterest expense	1,714		180			381			390		266		325			3,256
(Reversal of) provision for credit losses	—		(18		)	(3		)	43		—		(14		)	8
Income (loss) before income taxes and including noncontrolling interests	774		392			203			278		44		(580		)	1,111
Income tax expense (benefit)	242		154			79			66		17		(210		)	348
Net income (loss) including noncontrolling interest	532		238			124			212		27		(370		)	763
Deduct: net loss from noncontrolling interests	—		—			—			—		—		19			19
Net income (loss) attributable to MUAH	$	532	$	238		$	124		$	212	$	27	$	(351	)	$	782
Total assets, end of period	$	62,187	$	13,278		$	1,778		$	13,607	$	32,313	$	25,734		$	148,897