Premises and Equipment (Summary of Premises and Equipment) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Land and land improvements	$ 527	$ 547
Buildings and building improvements	1,288	1,235
Furniture and equipment	1,102	1,141
Leasehold improvements	633	555
Construction in progress	38	37
Capitalized leases on premises and equipment	58	59
Total	3,646	3,574
Less-accumulated depreciation and amortization	(1,777)	(1,686)
Net premises and equipment	$ 1,869	$ 1,888
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