Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Assets
Cash and due from banks	$ 1,845		$ 1,419
Interest bearing deposits in banks	3,477		2,764
Federal funds sold and securities purchased under resale agreements	169		12
Total cash and cash equivalents	5,491		4,195
Trading account assets (includes $1 at December 31, 2012 and $14 at December 31, 2011 of assets pledged as collateral)	1,208		1,135
Securities available for sale	21,352		22,833
Securities held to maturity (Fair value: December 31, 2012, $1,135; December 31, 2011, $1,429)	1,103		1,273
Loans held for investment	60,034	[1]	53,540	[1]
Allowance for loan losses	(653)		(764)
Loans held for investment, net	59,381		52,776
Premises and equipment, net	710		684
Intangible assets	376		360
Goodwill	2,942		2,457
FDIC indemnification asset	338		598
Other assets	4,091		3,365
Total assets	96,992		89,676
Deposits:
Noninterest bearing	25,478		20,598
Interest bearing	48,777		43,822
Total deposits	74,255		64,420
Commercial paper and other short-term borrowings	1,363		3,683
Long-term debt	5,622		6,684
Trading account liabilities	895		1,040
Other liabilities	2,102		2,019
Total liabilities	84,237		77,846
Commitments, contingencies and guarantees-See Note 21
UNBC 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 December 31, 2012 and December 31, 2011	136		136
Additional paid-in capital	5,994		5,989
Retained earnings	6,875		6,246
Accumulated other comprehensive loss	(514)		(809)
Total UNBC stockholder's equity	12,491		11,562
Noncontrolling interests	264		268
Total equity	12,755		11,830
Total liabilities and equity	$ 96,992		$ 89,676

[1] Includes $5 million and ($30) million at December 31, 2012 and 2011, respectively, for net unamortized discounts and premiums and deferred fees and costs.