Loans and Allowance for Credit Losses, Loans Outstanding (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 766,521	$ 769,631
Commercial and Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	168,546	167,216
Commercial Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	105,874	105,975
Commercial Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,549	19,382
Lease Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	13,143	13,117
Foreign Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	39,637	39,760
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	345,749	345,450
Real estate 1-4 family first mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	228,885	228,894
Real estate 1-4 family junior lien mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	83,173	85,991
Credit Card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	21,998	22,836
Other revolving credit and installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	86,716	86,460
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 420,772	$ 424,181

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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