Bank Premises and Equipment (Detail) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Building [Member] Upper Limit	Dec. 31, 2013 Building [Member] Minimum [Member]	Dec. 31, 2013 Equipment [Member] Upper Limit	Dec. 31, 2013 Equipment [Member] Minimum [Member]	Dec. 31, 2013 Leasehold Improvements [Member] Upper Limit	Dec. 31, 2013 Leasehold Improvements [Member] Minimum [Member]
Property, Plant and Equipment [Line Items]
Land and improvements	$ 838	$ 841
Buildings	1,763	1,692
Equipment	1,581	1,460
Leasehold improvements	397	386
Construction in Progress	118	141
Accumulated depreciation and amortization	2,166	1,978
Total	$ 2,531	$ 2,542
Useful life			30 years	2 years	30 years	1 year	30 years	5 years