Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 2,061	$ 2,057
Interest bearing deposits in banks	6,289	1,335
Total cash and cash equivalents	8,350	3,392
Securities borrowed or purchased under resale agreements	22,368	20,894
Trading account assets (includes $1,239 at December 31, 2018 and $1,001 at December 31, 2017 pledged as collateral that may be repledged)	11,213	10,567
Securities held to maturity (fair value $10,720 at December 31, 2018 and $9,799 at December 31, 2017)	10,901	9,885
Loans held for investment	86,507	80,014
Allowance for loan losses	(474)	(476)
Loans held for investment, net	86,033	79,538
Premises and equipment, net	635	610
Goodwill	3,301	3,301
Other assets	9,620	9,410
Total assets	168,100	154,550
Deposits:
Noninterest bearing	31,754	32,602
Interest bearing	59,225	52,185
Total deposits	90,979	84,787
Securities loaned or sold under repurchase agreements	27,285	26,437
Securities Sold under Agreements to Repurchase and Securities Loaned	27,285	26,437
Commercial paper and other short-term borrowings	9,263	7,066
Long-term debt	17,918	12,162
Trading account liabilities	4,027	3,600
Other liabilities	2,048	2,143
Total liabilities	151,520	136,195
Commitments, contingencies and guarantees—See Note 20
MUAH stockholders' equity:
Authorized 5,000,000 shares; no shares issued or outstanding	0	0
Authorized 1,700,000,000 shares, 131,935,124 shares issued and outstanding as of December 31, 2018 and authorized 300,000,000 shares, 147,589,713 shares issued and outstanding as of December 31, 2017	132	148
Additional paid-in capital	8,176	8,197
Retained earnings	9,524	10,936
Accumulated other comprehensive loss	(1,324)	(1,026)
Total MUAH stockholders' equity	16,508	18,255
Noncontrolling interests	72	100
Total equity	16,580	18,355
Total liabilities and equity	168,100	154,550
Other Subsidiaries, Excluding MUFG Bank, NA [Member]
Deposits:
Long-term debt	931	1,355
Consumer
Assets
Loans held for investment	43,372	39,105
Allowance for loan losses	(110)	(86)
Commercial
Assets
Loans held for investment	43,135	40,909
Allowance for loan losses	(359)	$ (360)
Notes Receivable [Member] | Consumer | Residential mortgage
Assets
Loans held for investment	38,000
Notes Receivable [Member] | Commercial | Commercial mortgage
Assets
Loans held for investment	16,000
Financial and Insurance [Member] | Notes Receivable [Member] | Commercial
Assets
Loans held for investment	7,000
Power and Utilities [Member] | Notes Receivable [Member] | Commercial
Assets
Loans held for investment	4,000
Oil and Gas [Member] | Notes Receivable [Member] | Commercial
Assets
Loans held for investment	3,000
Manufacturing Sector [Member] | Notes Receivable [Member] | Commercial
Assets
Loans held for investment	$ 4,000