Loans and Leases (Recorded Investment In Each Class Of Total Loans And Leases By Credit Quality Indicator) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 14,046	$ 10,053
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	418	460
Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	13,628	9,593
Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	10,712	6,388
Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,245	1,016
Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	492	935
Leases Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,179	1,254
Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	379	380
Other Acquired Credit Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	39
Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	34	41
Investment Grade [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	13,003	9,102
Investment Grade [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	10,374	6,341
Investment Grade [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,004	592
Investment Grade [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	492	935
Investment Grade [Member] | Leases Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,104	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
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
Investment Grade [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	29	36
Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,038	946
Speculative [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	338	47
Speculative [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	241	424
Speculative [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	0
Speculative [Member] | Leases Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	75	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
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] | Leases 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