Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (Detail) (USD $) In Millions	Sep. 30, 2011		Jun. 30, 2011	Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010	Dec. 31, 2009
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	$ 416	[1]		$ 435	[2]
Collectively evaluated for impairment	1,872	[1]		2,416	[2]
Loans acquired with deteriorated credit quality	2	[1]		3	[2]
Unallocated	149	[1]		150	[2]
Total allowance for loan and lease losses	2,439	[3]	2,614	3,004	[3]	3,194	[3]	3,693	3,749
Individually evaluated for impairment	3,043	[4]		2,907	[5]
Collectively evaluated for impairment	76,098	[4]		74,514	[5]
Loans acquired with deteriorated credit quality	13	[4]		24	[5]
Total Loans and Leases	79,154	[6]		77,445	[5],[7]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	221	[1]		209	[2]
Collectively evaluated for impairment	1,427	[1]		1,779	[2]
Loans acquired with deteriorated credit quality	1	[1]		1	[2]
Total allowance for loan and lease losses	1,649	[1]	1,764	1,989	[2]
Individually evaluated for impairment	1,225	[4]		1,076	[5]
Collectively evaluated for impairment	42,941	[4]		42,382	[5]
Loans acquired with deteriorated credit quality	3	[4]		4	[5]
Total Loans and Leases	44,169	[4]		43,462	[5]
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	130	[1]		119	[2]
Collectively evaluated for impairment	102	[1]		189	[2]
Loans acquired with deteriorated credit quality	1	[1]		2	[2]
Total allowance for loan and lease losses	233	[1]	268	310	[2]
Individually evaluated for impairment	1,237	[4]		1,180	[5]
Collectively evaluated for impairment	8,940	[4]		7,718	[5]
Loans acquired with deteriorated credit quality	10	[4]		12	[5]
Total Loans and Leases	10,187	[4]		8,910	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	65	[1]		107	[2]
Collectively evaluated for impairment	343	[1]		448	[2]
Total allowance for loan and lease losses	408	[1]	452	555	[2]
Individually evaluated for impairment	581	[4]		651	[5]
Collectively evaluated for impairment	24,217	[4]		24,414	[5]
Loans acquired with deteriorated credit quality				8	[5]
Total Loans and Leases	24,798	[4]		25,073	[5]
Unallocated (Member)
Financing Receivable, Allowance for Credit Losses [Line Items]
Unallocated	149	[1]		150	[2]
Total allowance for loan and lease losses	$ 149	[1]	$ 130	$ 150	[2]

[1] Includes $14 related to leveraged leases

[2] Includes $15 related to leveraged leases.

[3] Includes $35, $52, and $56 of cash, $7, $7 and $7 of other short-term investments, $29, $29 and $29 of commercial mortgage loans, $228, $241 and $248 of home equity loans, $334, $648 and $771 of automobile loans, ($10), ($14) and ($15) of ALLL, $3, $7 and $7 of other assets, $5, $12 and $17 of other liabilities and $270, $692 and $834 of long-term debt from consolidated VIEs that are included in their respective captions above at September 30, 2011, December 31, 2010 and September 30, 2010, respectively. See Note 9.

[4] Excludes $62 of residential mortgage loans measured at fair value, and includes $1,018 of leveraged leases, net of unearned income.

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

[6] Excludes $62 of loans measured at fair value.

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