Loans and Commitments to Extend Credit (Net Unfunded Credit Commitments) (Details) (Commitments to Extend Credit [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Net Unfunded Loan Commitments	$ 131,446	$ 129,870
Total commercial lending [Member]
Financing Receivable, Recorded Investment [Line Items]
Net Unfunded Loan Commitments	91,209	90,104
Home Equity Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Net Unfunded Loan Commitments	18,323	18,754
Credit Card [Member]
Financing Receivable, Recorded Investment [Line Items]
Net Unfunded Loan Commitments	17,343	16,746
Other
Financing Receivable, Recorded Investment [Line Items]
Net Unfunded Loan Commitments	$ 4,571	$ 4,266