Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$ 1,911	$ 1,863
Interest bearing deposits in banks	2,353	4,329
Federal funds sold and securities purchased under resale agreements	65	11
Total cash and cash equivalents	4,329	6,203
Trading account assets (includes $25 at June 30, 2014 and $8 at December 31, 2013 of assets pledged as collateral)	941	851
Securities available for sale	14,670	15,817
Securities held to maturity (Fair value: June 30, 2014, $8,251; December 31, 2013, $6,439)	8,177	6,509
Loans held for investment	72,369	68,312
Allowance for loan losses	(559)	(568)
Loans held for investment, net	71,810	67,744
Premises and equipment, net	632	688
Goodwill	3,227	3,228
Other assets	5,034	4,854
Total assets	108,820	105,894
Deposits:
Noninterest bearing	27,446	26,495
Interest bearing	54,120	53,606
Total deposits	81,566	80,101
Commercial paper and other short-term borrowings	2,870	2,563
Long-term debt	6,995	6,547
Trading account liabilities	664	540
Other liabilities	1,666	1,675
Total liabilities	93,761	91,426
Commitments, contingencies and guarantees-See Note 13
MUAH stockholder's equity:
Preferred stock: Authorized 5,000,000 shares; no shares issued or outstanding
Common stock, par value $1 per share: Authorized 300,000,000 shares, 136,330,830 shares issued and outstanding as of June 30, 2014 and December 31, 2013	136	136
Additional paid-in capital	7,184	7,191
Retained earnings	7,936	7,512
Accumulated other comprehensive loss	(441)	(624)
Total MUAH stockholder's equity	14,815	14,215
Noncontrolling interests	244	253
Total equity	15,059	14,468
Total liabilities and equity	$ 108,820	$ 105,894