Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Cash and due from banks	$ 1,405	$ 1,845
Interest bearing deposits in banks	1,899	3,477
Federal funds sold and securities purchased under resale agreements	50	169
Total cash and cash equivalents	3,354	5,491
Trading account assets (includes $4 at June 30, 2013 and $1 at December 31, 2012 of assets pledged as collateral)	844	1,208
Securities available for sale	23,510	21,352
Securities held to maturity (Fair value: June 30, 2013, $891; December 31, 2012, $1,135)	905	1,103
Loans held for investment	65,843	60,034
Allowance for loan losses	(625)	(653)
Loans held for investment, net	65,218	59,381
Premises and equipment, net	699	710
Intangible assets	322	376
Goodwill	3,186	2,942
FDIC indemnification asset	233	338
Other assets	3,990	4,091
Total assets	102,261	96,992
Deposits:
Noninterest bearing	25,655	25,478
Interest bearing	51,655	48,777
Total deposits	77,310	74,255
Commercial paper and other short-term borrowings	3,792	1,363
Long-term debt	6,058	5,622
Trading account liabilities	566	895
Other liabilities	1,866	2,102
Total liabilities	89,592	84,237
Commitments, contingencies and guarantees - See Note 12
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 June 30, 2013 and December 31, 2012	136	136
Additional paid-in capital	5,979	5,994
Retained earnings	7,163	6,875
Accumulated other comprehensive loss	(879)	(514)
Total UNBC stockholder's equity	12,399	12,491
Noncontrolling interests	270	264
Total equity	12,669	12,755
Total liabilities and equity	$ 102,261	$ 96,992