Supplemental information to the Consolidated Statement of Cash Flows- Noncash Investing and Financing Transactions that are Not Reflected in Consolidated Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Supplemental Cash Flow Information [Abstract]
Transfers from loans to other assets for other real estate owned (“OREO”)	$ 3	$ 6
Change in assets of consolidated VIEs	210	22
Change in liabilities of consolidated VIEs	277	39
Change in noncontrolling interests of consolidated VIEs	$ 12	$ 111