Fair Value, Estimates for Financial Instruments Not Carried at Fair Value (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Assets:
Mortgages held for sale	$ 31,254	$ 51,763
Loans held for sale	1,512	1,290
Loans	751,921	757,267
Nonmarketable equity investments (cost method)	8,029	8,494
Liabilities:
Deposits	853,635	847,942
Long-term debt	142,872	156,983
Carrying amount [Member]
Assets:
Mortgages held for sale	6,079	4,232
Loans held for sale	410	417
Loans	718,226	721,016
Nonmarketable equity investments (cost method)	8,029	8,494
Liabilities:
Deposits	853,635	847,942
Long-term debt	142,729	156,651
Estimated fair value [Member]
Assets:
Mortgages held for sale	6,079	4,234
Loans held for sale	422	441
Loans	708,566	710,147
Nonmarketable equity investments (cost method)	8,540	8,814
Liabilities:
Deposits	855,262	849,642
Long-term debt	$ 145,943	$ 159,996

This item represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet. The original cost of the investments may differ from the aggregate carrying amount disclosed due to various adjustments such as: (i) dividends received in excess of earnings after the date of investment that are considered a return of investment and therefore recorded as reductions to cost of the investment, or (ii) a series of operating losses of an investee or other factors which may indicate that a decrease in value of the investment has occurred which is other than temporary and accordingly such decrease in value has been recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases.

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- Definition

Carrying amount of mortgage loans to individuals not classified as held for investment but are held-for-sale.

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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