Loans and Leases (Net Loans) (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
Allowance for loan losses	(22)	(22)
Loans and leases, net of allowance for loan losses	14,024	10,031
Institutional [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	13,628	9,593
Institutional [Member] \| U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment funds	9,583	5,592
Commercial and financial	648	563
Purchased receivables	319	563
Lease financing	381	397
Institutional [Member] \| Non-U.S. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investment funds	1,129	796
Commercial and financial	597	453
Purchased receivables	173	372
Lease financing	798	857
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	418	460
Commercial Real Estate [Member] \| U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate	$ 418	$ 460

The total gross amount of commercial loans (money lent to commercial entities rather than consumers) made in the form of direct financing leases where the reporting entity (lessor) only recognizes interest revenue from the lease. It also includes the amount of lease financing arising from involvement with leveraged lease transactions where the Entity is in the position of long-term creditor.

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-Glossary Leveraged Lease

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+ Details

- Definition

The allowance for loan and lease losses represents the reserve to cover probable credit losses related to specifically identified loans and leases, as well as probable credit losses inherent in the remainder of the loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for loan losses in connection with business combinations determined to be appropriate.

+ References

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+ Details

- Definition

Reflects the gross carrying amount of unpaid loans issued to financial institutions for cash needs or a financial asset purchase, including loans to real estate investment trusts, mortgage companies, and banks.

+ References+ Details

- Definition

Reflects the sum of the gross carrying amounts of unpaid loans issued to businesses to acquire, develop, construct, improve, or refinance land or a building. Includes [but is not limited to] commercial mortgage loans, which are secured by a [legal] security interest in real property [commercial building or business real property] which thereby serves as collateral securing repayment of the loan; and construction financing, which is an obligation generally in the form of a [promissory] note, used for the funding of construction projects.

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