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, 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)	(21)
Other	[1]	(1)			(21)		21	(1)
Net change		192			(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		18,293		148	8,190	11,101	(1,246)	100
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		329	[2]			344		(15)
Other comprehensive income (loss), net of tax		(39)					(39)
Compensation—restricted stock units		(37)			(35)	(2)
Other		1				1
Net change		254			(35)	343	(39)	(15)
Balance, ending at Jun. 30, 2018		18,547		148	8,155	11,444	(1,285)	85
Balance, beginning at Dec. 31, 2018		16,580		132	8,176	9,524	(1,324)	72
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		375				383		(8)
Other comprehensive income (loss), net of tax		391					391
Compensation—restricted stock units		(21)			(19)	(2)
Other		4			0	5	0	(1)
Net change		749			(19)	386	391	(9)
Balance, ending at Jun. 30, 2019		17,329		132	8,157	9,910	(933)	63
Balance, beginning at Mar. 31, 2019		16,964		132	8,193	9,713	(1,141)	67
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		196	[2]			199		(3)
Other comprehensive income (loss), net of tax		208					208
Compensation—restricted stock units		(38)			(36)	(2)
Other		(1)				0		(1)
Net change		365			(36)	197	208	(4)
Balance, ending at Jun. 30, 2019		$ 17,329		$ 132	$ 8,157	$ 9,910	$ (933)	$ 63

[1] For additional information on other, see Note 10 "Accumulated Other Comprehensive Income".

[2] As of and for the Three Months Ended June 30, 2019:(Dollars in millions) Regional Bank U.S. Wholesale & Investment Banking Transaction Banking MUSA Other MUFG Americas Holdings CorporationResults of operations Net interest income $573 $116 $69 $37 $(18) $777Noninterest income 118 79 14 85 353 649Total revenue 691 195 83 122 335 1,426Noninterest expense 538 113 57 113 333 1,154(Reversal of) provision for credit losses 32 27 — — (3) 56Income (loss) before income taxes and including noncontrolling interests 121 55269 5216Income tax expense (benefit) (1) 20 (4) 7 2 (5) 20Net income (loss) including noncontrolling interests 101 59 19 7 10 196Deduct: net (income) loss from noncontrolling interests — — — — 3 3Net income (loss) attributable to MUAH $101 $59 $19 $7 $13 $199 Total assets, end of period $75,858 $20,331 $911 $35,131 $39,779 $172,010