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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher OTS
-Name Federal Regulation (FR)
-Number Title 12
-Chapter V
-Section 563c.102
-Paragraph 8
-Subparagraph a(ii)
-Subsection I
-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section L
-Subsection 1

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 114
-Paragraph 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 9
-Section 03
-Paragraph 7
-Subparagraph d

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 8, 9
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

+ Details

Loans and Leases (Schedule of Allowance for Loan Losses) (Details) (USD $) In Millions									6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2009	Jun. 30, 2011 Institutional [Member] Loans and Leases [Member]	Dec. 31, 2010 Institutional [Member] Loans and Leases [Member]	Jun. 30, 2011 Loans and Leases [Member]	Dec. 31, 2010 Loans and Leases [Member]	Jun. 30, 2011 Loans and Leases [Member] Commercial Real Estate [Member]	Dec. 31, 2010 Loans and Leases [Member] Commercial Real Estate [Member]	Jun. 30, 2011 Institutional [Member] Allowance for Loan Losses [Member]	Dec. 31, 2010 Institutional [Member] Allowance for Loan Losses [Member]	Jun. 30, 2011 Allowance for Loan Losses [Member]	Dec. 31, 2010 Allowance for Loan Losses [Member]	Jun. 30, 2011 Allowance for Loan Losses [Member] Commercial Real Estate [Member]	Dec. 31, 2010 Allowance for Loan Losses [Member] Commercial Real Estate [Member]	Jun. 30, 2011 Institutional [Member]	Dec. 31, 2010 Institutional [Member]	Jun. 30, 2011 Commercial Real Estate [Member]	Dec. 31, 2010 Commercial Real Estate [Member]
Individually evaluated for impairment							$ 90	$ 112	$ 689	$ 735	$ 599	$ 623			$ 24	$ 24	$ 24	$ 24
Collectively evaluated for impairment							12,179	11,081	12,179	11,081			22	31	22	31
Loans acquired with deteriorated credit quality									64	141	64	141			8	45	8	45
Total	12,932		11,957																12,269	11,193	663	764
Total	$ 54	$ 80	$ 100	$ 102	$ 91	$ 79													$ 22	$ 31	$ 32	$ 69