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Noncash Investing and Financing Transactions that are Not Reflected in Consolidated Statement of Cash Flows (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Noncash or Part Noncash Acquisitions [Line Items]      
Transfers from loans to other assets for OREO $ 7 $ 16 $ 11
Assets of consolidated VIEs 134 3,419 15,249
Liabilities of consolidated VIEs 96 3,478 13,949
Noncontrolling interests of consolidated VIEs 163 29 699
Disposition of business   $ 544