Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011		Sep. 30, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	$ 81,541	[1],[2],[3]	$ 79,207	[1],[4],[5]	$ 77,316	[1],[6],[7]
30-89 Days Past Due	431	[1],[2],[3]	519	[1],[4],[5]	514	[1],[6],[7]
90 Days and Greater	1,011	[1],[2],[3]	1,227	[1],[4],[5]	1,324	[1],[6],[7]
Total Past Due	1,442	[2],[3]	1,746	[4],[5]	1,838	[6],[7]
Total Loans and Leases	82,983	[2],[3],[8]	80,953	[4],[5],[9]	79,154	[10],[6],[7]
90-Days past Due and Still Accruing	201	[2],[3]	200	[4],[5]	274	[6],[7]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	46,913	[8]	45,472	[9]	44,169	[10]
Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	33,104	[1]	30,493	[1]	28,949	[1]
30-89 Days Past Due	55	[1]	49	[1]	57	[1]
90 Days and Greater	185	[1]	241	[1]	252	[1]
Total Past Due	240		290		309
Total Loans and Leases	33,344		30,783		29,258
90-Days past Due and Still Accruing	1		4		9
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	4,841	[1]	5,088	[1]	5,291	[1]
30-89 Days Past Due	17	[1]	62	[1]	35	[1]
90 Days and Greater	115	[1]	116	[1]	120	[1]
Total Past Due	132		178		155
Total Loans and Leases	4,973		5,266		5,446
90-Days past Due and Still Accruing	21		1		2
Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	4,200	[1]	4,649	[1]	4,629	[1]
30-89 Days Past Due	34	[1]	41	[1]	73	[1]
90 Days and Greater	141	[1]	182	[1]	182	[1]
Total Past Due	175		223		255
Total Loans and Leases	4,375		4,872		4,884
90-Days past Due and Still Accruing	1		2		7
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	589	[1]	887	[1]	1,024	[1]
30-89 Days Past Due			12	[1]	11	[1]
90 Days and Greater	83	[1]	121	[1]	178	[1]
Total Past Due	83		133		189
Total Loans and Leases	672		1,020		1,213
90-Days past Due and Still Accruing			1		44
Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	3,547	[1]	3,521	[1]	3,355	[1]
30-89 Days Past Due	1	[1]	4	[1]	3	[1]
90 Days and Greater	1	[1]	6	[1]	10	[1]
Total Past Due	2		10		13
Total Loans and Leases	3,549		3,531		3,368
90-Days past Due and Still Accruing					1
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	11,207	[1],[11],[2]	10,149	[1],[12],[4]	9,721	[1],[13],[6]
30-89 Days Past Due	97	[1],[11],[2]	110	[1],[12],[4]	107	[1],[13],[6]
90 Days and Greater	328	[1],[11],[2]	348	[1],[12],[4]	359	[1],[13],[6]
Total Past Due	425	[11],[2]	458	[12],[4]	466	[13],[6]
Total Loans and Leases	11,632	[11],[2]	10,607	[12],[4]	10,187	[13],[6]
90-Days past Due and Still Accruing	76	[11],[2]	79	[12],[4]	91	[13],[6]
Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	24,438	[8]	24,874	[9]	24,798	[10]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	9,994	[1]	10,455	[1]	10,651	[1]
30-89 Days Past Due	126	[1]	136	[1]	128	[1]
90 Days and Greater	118	[1]	128	[1]	141	[1]
Total Past Due	244		264		269
Total Loans and Leases	10,238		10,719		10,920
90-Days past Due and Still Accruing	65		74		83
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	11,840	[1]	11,744	[1]	11,514	[1]
30-89 Days Past Due	62	[1]	71	[1]	67	[1]
90 Days and Greater	10	[1]	12	[1]	12	[1]
Total Past Due	72		83		79
Total Loans and Leases	11,912		11,827		11,593
90-Days past Due and Still Accruing	9		9		9
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	1,927	[1]	1,873	[1]	1,777	[1]
30-89 Days Past Due	37	[1]	33	[1]	32	[1]
90 Days and Greater	30	[1]	72	[1]	69	[1]
Total Past Due	67		105		101
Total Loans and Leases	1,994		1,978		1,878
90-Days past Due and Still Accruing	28		30		28
Consumer Portfolio Segment | Consumer Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	292	[1]	348	[1]	405	[1]
30-89 Days Past Due	2	[1]	1	[1]	1	[1]
90 Days and Greater			1	[1]	1	[1]
Total Past Due	2		2		2
Total Loans and Leases	$ 294		$ 350		$ 407

[1] Includes accrual and nonaccrual loans and leases.

[2] Excludes $76 of loans measured at fair value.

[3] Includes an immaterial amount of government insured commercial loans 30-89 days and 90 days past due and accruing whose repayments are insured by the Small Business Administration at September 30, 2012.

[4] Excludes $65 of loans measured at fair value.

[5] Includes an immaterial amount of government insured commercial loans 30-89 and 90 days past due and accruing whose repayments are insured by the Small Business Administration at December 31, 2011.

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

[7] Includes $1 of government insured loans 30-89 days past due and accruing of government insured commercial loans whose repayments are insured by the Small Business Administration at September 30, 2011 and an immaterial amount of government insured commercial loans 90 days past due and still accruing.

[8] Excludes $76 of residential mortgage loans measured at fair value, and includes $914 of leveraged leases, net of unearned income.

[9] Excludes $65 of residential mortgage loans measured at fair value, and includes $1,022 of leveraged leases, net of unearned income.

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

[11] Information for current residential mortgage loans includes advances made pursuant to servicing agreements for GNMA mortgage pools whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs. As of September 30, 2012, $79 of these loans were 30-89 days past due and $392 were 90 days or more past due. The Bancorp recognized an immaterial amount of losses during the three months ended September 30, 2012 and $2 of losses during the nine months ended September 30, 2012 due to claim denials and curtailments associated with these advances.

[12] Information for current residential mortgage loans includes advances made pursuant to servicing agreements for GNMA mortgage pools whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs. As of December 31, 2011, $45 of these loans were 30-89 days past due and $309 were 90 days or more past due. The Bancorp recognized an immaterial amount of losses for the year ended December 31, 2011 due to claim denials and curtailments associated with these advances.

[13] Information for current residential mortgage loans includes advances made pursuant to servicing agreements for GNMA mortgage pools whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs. As of September 30, 2011, $33 of these loans were 30-89 days past due and $291 were 90 days or more past due. The Bancorp recognized an immaterial amount of losses for the three and nine months ended September 30, 2011 due to claim denials and curtailments associated with these advances.