Asset Quality (Home Equity and Residential Real Estate Balances) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	$ 7,330		$ 6,533
Government Insured or Guaranteed Loans	2,503		2,884
Total loans	180,425	[1],[2],[3],[4]	159,014	[1],[2],[3],[4]	150,319
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	10,557	[5],[6],[7],[8]	10,021	[5],[6],[7],[8]
Purchased Impaired Loans - Outstanding Balance	4,041	[10],[11],[12],[13],[9]	3,128	[10],[11],[12],[13],[9]
Total Consumer Real Estate Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	44,712	[14],[5],[6],[7],[8]	41,014	[14],[5],[6],[7],[8]
Purchased Impaired Loans - Outstanding Balance	7,330	[10],[11],[14],[9]	6,533	[10],[11],[14],[9]
Government Insured or Guaranteed Loans	2,503	[14]	2,884	[14]
Purchase accounting, deferred fees and other accounting adjustments	(2,884)		(2,873)
Total loans	$ 51,661	[15]	$ 47,558	[15]

[1] Net of unearned income, net deferred loan fees, unamortized discounts and premiums, and purchase discounts and premiums totaling $3.1 billion and $2.3 billion atJune 30, 2012 and December 31, 2011, respectively.

[2] Future accretable yield related to purchased impaired loans is not included in loans outstanding.

[3] Amounts represent the assets or liabilities of consolidated variable interest entities (VIEs).

[4] Amounts represent items for which the Corporation has elected the fair value option.

[5] Excludes purchased impaired loans of approximately $7.3 billion and $6.5 billion in outstanding balances, certain government insured or guaranteed residential real estate mortgages of approximately $2.5 billion and $2.9 billion, and loans held for sale at June 30, 2012 and December 31, 2011, respectively. See the Consumer Real Estate Secured Asset Quality Indicators - Purchased Impaired Loans table below for additional information on purchased impaired loans.

[6] Amounts shown represent outstanding balance.

[7] Based upon updated LTV (inclusive of CLTV for second lien positions).

[8] Updated LTV (inclusive of CLTV for second lien positions) are estimated using modeled property values. These ratios are updated semi-annually. The related estimates and inputs are based upon an approach that uses a combination of third-party automated valuation models (AVMs), HPI indices, property location, internal and external balance information, origination data and management assumptions. In cases where we are in an originated second lien position, we generally utilize origination balances provided by a third-party which do not include an amortization assumption when calculating updated LTV. Accordingly, the results of these calculations do not represent actual appraised loan level collateral or updated LTV based upon a current first lien balance, and as such, are necessarily imprecise and subject to change as we enhance our methodology.

[9] Amounts shown represent outstanding balance. See Note 6 Purchased Loans for additional information.

[10] Based upon updated LTV (inclusive of CLTV for second lien positions).

[11] Updated LTV (inclusive of CLTV for second lien positions) are estimated using modeled property values. These ratios are updated semi-annually. The related estimates and inputs are based upon an approach that uses a combination of third-party AVMs, HPI indices, property location, internal and external balance information, origination data and management assumptions. In cases where we are in an originated second lien position, we generally utilize origination balances provided by a third-party which do not include an amortization assumption when calculating updated LTV. Accordingly, the results of these calculations do not represent actual appraised loan level collateral or updated LTV based upon a current first lien balance, and as such, are necessarily imprecise and subject to change as we enhance our methodology.

[12] For the estimate of cash flows utilized in our purchased impaired loan accounting, other assumptions and estimates are made, including amortization of first lien balances, pre-payment rates, etc., which are not reflected in this table.

[13] The following states have the highest percentage of loans at June 30, 2012: California 21%, Florida 21%, Illinois 8%, Ohio 6%, North Carolina 5%, and Michigan 4%. The remainder of the states have lower than a 4% concentration of purchased impaired loans individually, and collectively they represent approximately 35% of the purchased impaired portfolio. At December 31, 2011, the states with the highest percentage of loans were as follows: California 22%, Florida 13%, Illinois 12%, Ohio 9%, Michigan 5% and New York 4%. The remainder of the states have lower than a 4% concentration of purchased impaired loans individually, and collectively they represent approximately 35% of the purchased impaired portfolio.

[14] Represents outstanding balance.

[15] Represents recorded investment.