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, 2014		Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 16,114		$ 13,486
Investment Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	12,310		10,413
Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	2,258		1,526
Purchased Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	222		243
Lease Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,090		1,095
Property Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	205		180
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	29		29
Investment grade
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	14,322	[1]	12,362	[1]
Investment grade | Investment Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	12,073	[1]	10,282	[1]
Investment grade | Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	961	[1]	740	[1]
Investment grade | Purchased Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	222	[1]	243	[1]
Investment grade | Lease Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,037	[1]	1,068	[1]
Investment grade | Property Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	[1]	0	[1]
Investment grade | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	29	[1]	29	[1]
Speculative
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,776	[2]	1,108	[2]
Speculative | Investment Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	237	[2]	131	[2]
Speculative | Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,281	[2]	770	[2]
Speculative | Purchased Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	[2]	0	[2]
Speculative | Lease Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	53	[2]	27	[2]
Speculative | Property Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	205	[2]	180	[2]
Speculative | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	[2]	0	[2]
Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	16	[3]	16	[3]
Special mention | Investment Funds
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	[3]	0	[3]
Special mention | Commercial and Financial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	16	[3]	16	[3]
Special mention | Purchased Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	[3]	0	[3]
Special mention | Lease Financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	[3]	0	[3]
Special mention | Property Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	0	[3]	0	[3]
Special mention | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 0	[3]	$ 0	[3]

[1] Investment-grade loans and leases consist of counterparties with strong credit quality and low expected credit risk and probability of default. Ratings apply to counterparties with a strong capacity to support the timely repayment of any financial commitment.

[2] Speculative loans and leases consist of counterparties that face ongoing uncertainties or exposure to business, financial, or economic downturns. However, these counterparties may have financial flexibility or access to financial alternatives, which allow for financial commitments to be met.

[3] Special mention loans and leases consist of counterparties with potential weaknesses that, if uncorrected, may result in deterioration of repayment prospects.