Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Parenthetical) (Detail) (USD $) In Millions	Jun. 30, 2011		Mar. 31, 2011	Dec. 31, 2010		Jun. 30, 2010		Mar. 31, 2010	Dec. 31, 2009
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	$ 2,614	[1],[2]	$ 2,805	$ 3,004	[2],[3]	$ 3,693	[2]	$ 3,802	$ 3,749
Portfolio loans and leases	77,908	[4],[5]		77,445	[6],[7]
Leveraged Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan and lease losses	18			15
Portfolio loans and leases	1,015			1,039
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Portfolio loans and leases at fair value	$ 59			$ 46

[1] Includes $18 related to leverage leases.

[2] Includes $42, $52, and $74 of cash, $7, $7 and $7 of other short-term investments, $29, $29 and $0 of commercial mortgage loans, $231, $241 and $252 of home equity loans, $424, $648 and $911 of automobile loans, ($11), ($14) and ($16) of ALLL, $4, $7 and $7 of other assets, $8, $12 and $19 of other liabilities and $365, $692 and $996 of long-term debt from consolidated VIEs that are included in their respective captions above at June 30, 2011, December 31, 2010 and June 30, 2010, respectively. See Note 8.

[3] Includes $15 related to leverage leases.

[4] Excludes $59 of loans measured at fair value.

[5] Excludes $59 of residential mortgage loans measured at fair value, and includes $1,015 of leveraged leases, net of unearned income.

[6] Excludes $46 of loans measured at fair value.

[7] Excludes $46 of residential mortgage loans measured at fair value, and includes $1,039 of leveraged leases, net of unearned income.