Loans and Leases (Recorded Investment In Each Class Of Total Loans And Leases By Credit Quality Indicator) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 12,307	$ 10,053
Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	11,896	9,593
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	411	460
Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	9,205	6,388
Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,133	1,016
Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	394	935
Leases Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,164	1,254
Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	377	380
Other Acquired Credit Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		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	11,538	9,102
Investment Grade [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	8,937	6,341
Investment Grade [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,041	592
Investment Grade [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	394	935
Investment Grade [Member] | Leases Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,137	1,194
Investment Grade [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	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	769	946
Speculative [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	268	47
Speculative [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	92	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	27	60
Speculative [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	377	379
Speculative [Member] | Other Acquired Credit Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		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
Doubtful [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		0
Doubtful [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		0
Doubtful [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		0
Doubtful [Member] | Leases Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		0
Doubtful [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		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
Doubtful [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		$ 0