Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	$ 80,723	[1]	$ 79,207	[2]	$ 75,974	[3]
30-89 Days Past Due	422	[1],[4]	519	[2],[5]	520	[3],[6]
90 Days and Greater	1,138	[1],[4],[7]	1,227	[2],[5],[8]	1,414	[3],[6],[9]
Total Past Due	1,560	[1],[4]	1,746	[2],[5]	1,934	[3],[6]
Total Loans and Leases	82,283	[1],[10],[4]	80,953	[11],[2],[5]	77,908	[12],[3],[6]
90-Days past Due and Still Accruing	203	[1],[4]	200	[2],[5]	279	[3],[6]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	46,563	[10]	45,472	[11]	43,436	[12]
Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	32,360		30,493		27,737
30-89 Days Past Due	41		49		70
90 Days and Greater	211	[7]	241	[8]	292	[9]
Total Past Due	252		290		362
Total Loans and Leases	32,612		30,783		28,099
90-Days past Due and Still Accruing	2		4		7
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	4,992		5,088		5,064
30-89 Days Past Due	28		62		41
90 Days and Greater	132	[7]	116	[8]	124	[9]
Total Past Due	160		178		165
Total Loans and Leases	5,152		5,266		5,229
90-Days past Due and Still Accruing	22		1		8
Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	4,306		4,649		4,746
30-89 Days Past Due	36		41		37
90 Days and Greater	168	[7]	182	[8]	221	[9]
Total Past Due	204		223		258
Total Loans and Leases	4,510		4,872		5,004
90-Days past Due and Still Accruing			2		4
Commercial Portfolio Segment | Commercial Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	714		887		1,556
30-89 Days Past Due	3		12		40
90 Days and Greater	105	[7]	121	[8]	182	[9]
Total Past Due	108		133		222
Total Loans and Leases	822		1,020		1,778
90-Days past Due and Still Accruing			1		48
Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	3,464		3,521		3,314
30-89 Days Past Due	1		4		3
90 Days and Greater	2	[7]	6	[8]	9	[9]
Total Past Due	3		10		12
Total Loans and Leases	3,467		3,531		3,326
90-Days past Due and Still Accruing					1
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	10,917	[1],[13]	10,149	[14],[2]	9,334	[15],[3]
30-89 Days Past Due	99	[1],[13]	110	[14],[2]	102	[15],[3]
90 Days and Greater	337	[1],[13],[7]	348	[14],[2],[8]	354	[15],[3],[9]
Total Past Due	436	[1],[13]	458	[14],[2]	456	[15],[3]
Total Loans and Leases	11,353	[1],[13]	10,607	[14],[2]	9,790	[15],[3]
90-Days past Due and Still Accruing	80	[1],[13]	79	[14],[2]	87	[15],[3]
Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	24,367	[10]	24,874	[11]	24,682	[12]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	10,131		10,455		10,775
30-89 Days Past Due	125		136		130
90 Days and Greater	121	[7]	128	[8]	143	[9]
Total Past Due	246		264		273
Total Loans and Leases	10,377		10,719		11,048
90-Days past Due and Still Accruing	67		74		84
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	11,680		11,744		11,234
30-89 Days Past Due	49		71		68
90 Days and Greater	10	[7]	12	[8]	13	[9]
Total Past Due	59		83		81
Total Loans and Leases	11,739		11,827		11,315
90-Days past Due and Still Accruing	8		9		10
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	1,851		1,873		1,755
30-89 Days Past Due	40		33		28
90 Days and Greater	52	[7]	72	[8]	73	[9]
Total Past Due	92		105		101
Total Loans and Leases	1,943		1,978		1,856
90-Days past Due and Still Accruing	24		30		30
Consumer Portfolio Segment | Consumer Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	308		348		459
30-89 Days Past Due			1		1
90 Days and Greater			1	[8]	3	[9]
Total Past Due			2		4
Total Loans and Leases	$ 308		$ 350		$ 463

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

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

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

[4] Includes $1 of government insured commercial loans 30-89 days past due and accruing whose repayments are insured by the Small Business Administration at June 30, 2012 and an immaterial amount of government insured commercial loans 90 days past due and still accruing

[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] 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 June 30, 2011 and an immaterial amount of government insured commercial loans 90 days past due and still accruing.

[7] Includes accrual and nonaccrual loans and leases. Includes $1 of government insured commercial loans 30-89 days past due and accruing whose repayments are insured by the Small Business Administration at June 30, 2012 and an immaterial amount of government insured commercial loans 90 days past due and still accruing.

[8] Includes accrual and nonaccrual loans and leases.

[9] Includes accrual and nonaccrual loans and leases. (d) 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 June 30, 2011 and an immaterial amount of government insured commercial loans 90 days past due and still accruing.

[10] Excludes $76 of residential mortgage loans measured at fair value, and includes $967 of leveraged leases, net of unearned income.

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

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

[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 June 30, 2012, $50 of these loans were 30-89 days past due and $359 were 90 days or more past due. The Bancorp recognized $2 of losses for the three and six months ended June 30, 2012 due to claim denials and curtailments associated with these advances.

[14] 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.

[15] 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 June 30, 2011, $28 of these loans were 30-89 days past due and $271 were 90 days or more past due. The Bancorp recognized an immaterial amount of losses for the three months ended June 30, 2011 and $1 million for the six months ended June 30, 2011 due to claim denials and curtailments associated with these advances.