Loans - Repricing Characteristics (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Expected To Be Collected Over One Year but Within Five Years	$ 29,598
Loans and Leases Receivable, Expected To Be Collected After Five Years	17,989
Variable Rate Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Expected To Be Collected Over One Year but Within Five Years	23,921
Loans and Leases Receivable, Expected To Be Collected After Five Years	14,186
Fixed Rate Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Expected To Be Collected Over One Year but Within Five Years	5,677
Loans and Leases Receivable, Expected To Be Collected After Five Years	$ 3,803