Premises and Equipment - Premises and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Interest Cost Capitalized And Depreciation And Amortization Expenses For Property, Plant and Equipment [Line Items]
Land	$ 534	$ 525
Buildings and improvements	3,222	3,144
Furniture, fixtures and equipment	2,543	2,449
Capitalized building and equipment leases	97	95
Construction in progress	42	44
Premises and equipment, gross	6,438	6,257
Less accumulated depreciation and amortization	(3,768)	(3,600)
Total	$ 2,670	$ 2,657

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Property, plant, or equipment held under lease agreements classified as an asset.

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- Definition

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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