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, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 12,275	$ 10,053
Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	11,815	9,593
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	460	460
Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	8,502	6,388
Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,327	1,016
Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	744	935
Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,242	1,254
Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	380	380
Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	39	39
Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	41	41
Investment Grade [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	11,125	9,102
Investment Grade [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	8,435	6,341
Investment Grade [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	691	592
Investment Grade [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	744	935
Investment Grade [Member] | Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,215	1,194
Investment Grade [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1	1
Investment Grade [Member] | Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	3	3
Investment Grade [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	36	36
Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,114	946
Speculative [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	67	47
Speculative [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	636	424
Speculative [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	0
Speculative [Member] | Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	27	60
Speculative [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	379	379
Speculative [Member] | Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	31
Speculative [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	5
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	31
Special Mention [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0
Special Mention [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0
Special Mention [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0
Special Mention [Member] | Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0
Special Mention [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0
Special Mention [Member] | Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	31
Special Mention [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	5
Doubtful [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	0
Doubtful [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	0
Doubtful [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	0
Doubtful [Member] | Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	0
Doubtful [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	0
Doubtful [Member] | Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	5
Doubtful [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 0	$ 0