Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Income
Loans	$ 2,892	$ 2,839	$ 2,797
Securities	564	483	463
Securities borrowed or purchased under resale agreements	347	195	112
Trading assets	326	172	53
Other	50	27	12
Total interest income	4,179	3,716	3,437
Interest Expense
Deposits	241	194	200
Commercial paper and other short-term borrowings	58	32	13
Long-term debt	250	240	250
Securities loaned or sold under repurchase agreements	353	140	52
Trading liabilities	73	57	30
Total interest expense	975	663	545
Net Interest Income	3,204	3,053	2,892
(Reversal of) provision for credit losses	(103)	155	227
Net interest income after (reversal of) provision for credit losses	3,307	2,898	2,665
Noninterest Income
Service charges on deposit accounts	188	192	195
Trust and investment management fees	121	120	111
Trading account activities	(5)	105	62
Securities gains, net	17	69	20
Credit facility fees	98	108	117
Brokerage commissions and fees	69	64	79
Card processing fees, net	47	39	33
Investment banking and syndication fees	369	312	319
Fees from affiliates	866	957	763
Other, net	240	259	151
Total noninterest income	2,010	2,225	1,850
Noninterest Expense
Salaries and employee benefits	2,376	2,355	2,414
Net occupancy and equipment	357	325	335
Professional and outside services	439	369	318
Software	192	154	120
Regulatory assessments	82	72	53
Intangible asset amortization	30	28	42
Other	508	479	465
Total noninterest expense	3,984	3,782	3,747
Income before income taxes and including noncontrolling interests	1,333	1,341	768
Income tax expense	299	419	169
Net Income Including Noncontrolling Interests	1,034	922	599
Deduct: Net loss from noncontrolling interests	43	68	45
Net Income Attributable to MUAH	$ 1,077	$ 990	$ 644