Premises and Equipment (Summary of Premises and Equipment) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Land and land improvements	$ 533us-gaap_Land	$ 527us-gaap_Land
Buildings and building improvements	1,431us-gaap_BuildingsAndImprovementsGross	1,288us-gaap_BuildingsAndImprovementsGross
Furniture and equipment	986us-gaap_FurnitureAndFixturesGross	1,102us-gaap_FurnitureAndFixturesGross
Leasehold improvements	670us-gaap_LeaseholdImprovementsGross	633us-gaap_LeaseholdImprovementsGross
Construction in progress	47us-gaap_ConstructionInProgressGross	38us-gaap_ConstructionInProgressGross
Capitalized leases on premises and equipment	61us-gaap_CapitalLeasedAssetsGross	58us-gaap_CapitalLeasedAssetsGross
Total	3,728us-gaap_PropertyPlantAndEquipmentGross	3,646us-gaap_PropertyPlantAndEquipmentGross
Less-accumulated depreciation and amortization	(1,901)	(1,777)
Net premises and equipment	$ 1,827us-gaap_PropertyPlantAndEquipmentNet	$ 1,869us-gaap_PropertyPlantAndEquipmentNet
Building and Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	40
Furniture and Fixtures [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	5
Furniture and Fixtures [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful life (in years)	10

No authoritative reference available.

No definition available.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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