Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions		Total		Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balance, beginning at Dec. 31, 2016		$ 17,386		$ 144	$ 7,884	$ 10,101	$ (896)	$ 153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		509				524		(15)
Other comprehensive income (loss), net of tax		67					67
Compensation—restricted stock units		(16)			(16)	0
Other		(9)			0	0		(9)
Net change		551			(16)	524	67	(24)
Balance, ending at Jun. 30, 2017		17,937		144	7,868	10,625	(829)	129
Balance, beginning at Mar. 31, 2017							(883)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	[1]	285
Other comprehensive income (loss), net of tax		54
Balance, ending at Jun. 30, 2017		17,937		144	7,868	10,625	(829)	129
Balance, beginning at Dec. 31, 2017		18,355		148	8,197	10,936	(1,026)	100
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		496				510		(14)
Other comprehensive income (loss), net of tax		(280)					(280)
Compensation—restricted stock units		(23)			(21)	(2)
Other		(1)	[2]	0	(21)	0	21	(1)
Net change		192		0	(42)	508	(259)	(15)
Balance, ending at Jun. 30, 2018		18,547		148	8,155	11,444	(1,285)	85
Balance, beginning at Mar. 31, 2018							(1,246)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	[1]	329
Other comprehensive income (loss), net of tax		(39)
Balance, ending at Jun. 30, 2018		$ 18,547		$ 148	$ 8,155	$ 11,444	$ (1,285)	$ 85

[1] As of and for the Three Months Ended June 30, 2018:(Dollars in millions) Regional Bank U.S. Wholesale & Investment Banking Transaction Banking MUSA Other MUFG Americas Holdings CorporationResults of operations Net interest income $540 $101 $67 $51 $66 $825Noninterest income 116 98 15 77 290 596Total revenue 656 199 82 128 356 1,421Noninterest expense 532 103 65 116 267 1,083(Reversal of) provision for credit losses (5) (5) — — (9) (19)Income (loss) before income taxes and including noncontrolling interests 129 1011712 98357Income tax expense (benefit) (1) 26 (4) 4 3 (1) 28Net income (loss) including noncontrolling interests 103 105 13 9 99 329Deduct: net (income) loss from noncontrolling interests — — — — 15 15Net income (loss) attributable to MUAH $103 $105 $13 $9 $114 $344 Total assets, end of period $70,186 $19,740 $991 $32,904 $36,552 $160,373

[2] For additional information on other, refer to Note 10