Loans and Leases (Recorded Investment In Each Class Of Total Loans And Leases By Credit Quality Indicator) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 13,985	$ 12,307
Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	13,576	11,896
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	409	411
Investment Funds | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	10,561	9,205
Commercial and Financial | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,531	1,133
Purchased Receivables | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	347	394
Lease Financing | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,137	1,164
Property Development | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	375	377
Other | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	34	34
Investment grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	12,889	11,538
Investment grade | Investment Funds | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	10,434	8,937
Investment grade | Commercial and Financial | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	984	1,041
Investment grade | Purchased Receivables | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	347	394
Investment grade | Lease Financing | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,095	1,137
Investment grade | Property Development | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	0
Investment grade | Other | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	29	29
Speculative
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,096	769
Speculative | Investment Funds | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	127	268
Speculative | Commercial and Financial | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	547	92
Speculative | Purchased Receivables | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	0
Speculative | Lease Financing | Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	42	27
Speculative | Property Development | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	375	377
Speculative | Other | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 5	$ 5