Loans and Commitments to Extend Credit (Net Unfunded Credit Commitments) (Details) (Commitments to Extend Credit [Member], USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]
Unfunded Credit Commitments, Net, Total	$ 103,236	[1]	$ 95,805	[1]
Commercial And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Unfunded Credit Commitments, Net, Total	65,497		59,256
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Unfunded Credit Commitments, Net, Total	18,613		19,172
Credit Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Unfunded Credit Commitments, Net, Total	15,699		14,725
Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Unfunded Credit Commitments, Net, Total	$ 3,427		$ 2,652

[1] Excludes standby letters of credit. See Note 17 Commitments and Guarantees for additional information on standby letters of credit.