Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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The value of new servicing assets, subsequently measured at amortized value, acquired or created during the current period through purchases or from transfers of financial assets.

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Amount of expense charged against earnings for the periodic recognition of servicing assets relative to estimated net servicing income.

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The charge against the valuation allowance related to a servicing asset that is subsequently measured using the amortization method.

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Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

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The net increase (decrease) in the valuation allowance for servicing assets subsequently measured using the amortization method.

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This item represents the contra-account activity for provisions recognized for impairments of servicing assets which is offset against the value of servicing assets to arrive at a net carrying value as of the date of the statement of financial position.

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Goodwill and Other Intangible Assets (Commercial Mortgage Servicing Rights) (Details) (USD $) In Millions, unless otherwise specified					6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Servicing Contracts [Member]	Dec. 31, 2012 Servicing Contracts [Member]	Jun. 30, 2013 Servicing Contracts [Member] Commercial Real Estate [Member]	Jun. 30, 2012 Servicing Contracts [Member] Commercial Real Estate [Member]	Jun. 30, 2013 Servicing Contracts [Member] Commercial Real Estate [Member] Originated MSRs [Member]	Jun. 30, 2012 Servicing Contracts [Member] Commercial Real Estate [Member] Originated MSRs [Member]	Jun. 30, 2013 Servicing Contracts [Member] Commercial Real Estate [Member] Purchased MSRs [Member]	Jun. 30, 2012 Servicing Contracts [Member] Commercial Real Estate [Member] Purchased MSRs [Member]
Servicing Assets At Amortized Value [Line Items]
Other intangible assets, beginning balance	$ 2,153	$ 1,797	$ 1,501	$ 1,071	$ 420	$ 468
Additions					86	25	31	18	55	7
Change in valuation allowance					73	(9)
Amortization expense					(54)	(86)
Other intangible assets, ending balance	2,153	1,797	1,501	1,071	525	398
Beginning balance - valuation allowance			(103)	(176)	(176)	(197)
Provision					(4)	(44)
Recoveries					76	11
Other					1	24
Ending balance - valuation allowance			$ (103)	$ (176)	$ (103)	$ (206)