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, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 10,053	$ 11,957
Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	9,593	11,193
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	460	764
Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	6,388	6,794
Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,016	730
Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	935	2,199
Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,254	1,470
Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	380	451
Property Development Acquired-Credit Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		42
Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	39	99
Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	41	172
Investment Grade [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	9,102	10,786
Investment Grade [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	6,341	6,674
Investment Grade [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	592	579
Investment Grade [Member] | Purchased Receivables [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	935	2,199
Investment Grade [Member] | Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,194	1,279
Investment Grade [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1	3
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	49
Speculative [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	946	929
Speculative [Member] | Investment Funds [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	47	120
Speculative [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	424	101
Speculative [Member] | Lease Financing [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	60	191
Speculative [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	379	362
Speculative [Member] | Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	31	47
Speculative [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	108
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		50
Substandard [Member] | Commercial And Financial [Member] | Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		50
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	192
Doubtful [Member] | Property Development [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		86
Doubtful [Member] | Property Development Acquired-Credit Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		42
Doubtful [Member] | Other Acquired Credit-Impaired [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	49
Doubtful [Member] | Other [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases		$ 15