Summary of the ALLL and Related Loans and Leases Classified by Portfolio Segment (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]
Individually evaluated for impairment	$ 445	[1]		$ 435	[2]
Collectively evaluated for impairment	2,037	[1]		2,416	[2]
Loans acquired with deteriorated credit quality	2	[1]		3	[2]
Unallocated	130	[1]		150	[2]
Total allowance for loan and lease losses	2,614	[1],[3]	2,805	3,004	[2],[3]	3,693	[3]	3,802	3,749
Individually evaluated for impairment	2,990	[4]		2,907	[5]
Collectively evaluated for impairment	74,904	[4]		74,514	[5]
Loans acquired with deteriorated credit quality	14	[4]		24	[5]
Total Loans and Leases	77,908	[4],[6]		77,445	[5],[7]
Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	245	[1]		209	[2]
Collectively evaluated for impairment	1,518	[1]		1,779	[2]
Loans acquired with deteriorated credit quality	1	[1]		1	[2]
Total allowance for loan and lease losses	1,764	[1]	1,855	1,989	[2]
Individually evaluated for impairment	1,181	[4]		1,076	[5]
Collectively evaluated for impairment	42,252	[4]		42,382	[5]
Loans acquired with deteriorated credit quality	3	[4]		4	[5]
Total Loans and Leases	43,436	[4]		43,462	[5]
Residential Mortgage Loans
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	126	[1]		119	[2]
Collectively evaluated for impairment	141	[1]		189	[2]
Loans acquired with deteriorated credit quality	1	[1]		2	[2]
Total allowance for loan and lease losses	268	[1]	286	310	[2]
Individually evaluated for impairment	1,220	[4]		1,180	[5]
Collectively evaluated for impairment	8,559	[4]		7,718	[5]
Loans acquired with deteriorated credit quality	11	[4]		12	[5]
Total Loans and Leases	9,790	[4]		8,910	[5]
Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment	74	[1]		107	[2]
Collectively evaluated for impairment	378	[1]		448	[2]
Total allowance for loan and lease losses	452	[1]	519	555	[2]
Individually evaluated for impairment	589	[4]		651	[5]
Collectively evaluated for impairment	24,093	[4]		24,414	[5]
Loans acquired with deteriorated credit quality				8	[5]
Total Loans and Leases	24,682	[4]		25,073	[5]
Unallocated (Member)
Financing Receivable, Allowance for Credit Losses [Line Items]
Unallocated	130	[1]		150	[2]
Total allowance for loan and lease losses	$ 130	[1]	$ 145	$ 150	[2]

[1] Includes $18 related to leverage leases.

[2] Includes $15 related to leverage leases.

[3] 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.

[4] Excludes $59 of residential mortgage loans measured at fair value, and includes $1,015 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 $59 of loans measured at fair value.

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