Premises and Equipment - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross	$ 5	$ 6
Operating Leases, Rent Expense, Net	220	228	225
Depreciation, Depletion and Amortization	$ 185	$ 188	$ 181