Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	$ 80,416	[1]	$ 79,207	[2]	$ 75,272	[3]
30-89 Days Past Due	458	[1]	519	[2]	707	[3]
90 Days and Greater	1,172	[1],[4]	1,227	[2],[4]	1,432	[3],[5]
Total Past Due	1,630	[1]	1,746	[2]	2,139	[3]
Total Loans and Leases	82,046	[1]	80,953	[2],[6]	77,411	[3],[7]
90-Days past Due and Still Accruing	216	[1]	200	[2]	266	[3]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	46,477	[8]	45,472	[6]	43,201	[7]
Commercial Portfolio Segment | Commercial And Industrial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	31,872		30,493		26,920
30-89 Days Past Due	77		49		132
90 Days and Greater	206	[4]	241	[4]	292	[5]
Total Past Due	283		290		424
Total Loans and Leases	32,155		30,783		27,344
90-Days past Due and Still Accruing	2		4		8
Commercial Portfolio Segment | Commercial Mortgage Loans Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	5,010		5,088		5,094
30-89 Days Past Due	30		62		57
90 Days and Greater	136	[4]	116	[4]	130	[5]
Total Past Due	166		178		187
Total Loans and Leases	5,176		5,266		5,281
90-Days past Due and Still Accruing	30		1		4
Commercial Portfolio Segment | Commercial Mortgage Loans Non Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	4,516		4,649		4,931
30-89 Days Past Due	48		41		103
90 Days and Greater	169	[4]	182	[4]	195	[5]
Total Past Due	217		223		298
Total Loans and Leases	4,733		4,872		5,229
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	782		887		1,775
30-89 Days Past Due	5		12		50
90 Days and Greater	114	[4]	121	[4]	155	[5]
Total Past Due	119		133		205
Total Loans and Leases	901		1,020		1,980
90-Days past Due and Still Accruing			1		23
Commercial Portfolio Segment | Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	3,507		3,521		3,352
30-89 Days Past Due	1		4		5
90 Days and Greater	4	[4]	6	[4]	10	[5]
Total Past Due	5		10		15
Total Loans and Leases	3,512		3,531		3,367
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	10,594	[1],[9]	10,149	[10],[2]	9,001	[11],[3]
30-89 Days Past Due	97	[1],[9]	110	[10],[2]	119	[11],[3]
90 Days and Greater	336	[1],[4],[9]	348	[10],[2],[4]	356	[11],[3],[5]
Total Past Due	433	[1],[9]	458	[10],[2]	475	[11],[3]
Total Loans and Leases	11,027	[1],[9]	10,607	[10],[2]	9,476	[11],[3]
90-Days past Due and Still Accruing	73	[1],[9]	79	[10],[2]	98	[11],[3]
Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	24,542	[8]	24,874	[6]	24,734	[7]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	10,250		10,455		10,946
30-89 Days Past Due	118		136		136
90 Days and Greater	125	[4]	128	[4]	140	[5]
Total Past Due	243		264		276
Total Loans and Leases	10,493		10,719		11,222
90-Days past Due and Still Accruing	74		74		84
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	11,771		11,744		11,050
30-89 Days Past Due	50		71		67
90 Days and Greater	11	[4]	12	[4]	12	[5]
Total Past Due	61		83		79
Total Loans and Leases	11,832		11,827		11,129
90-Days past Due and Still Accruing	8		9		9
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	1,795		1,873		1,703
30-89 Days Past Due	31		33		36
90 Days and Greater	70	[4]	72	[4]	82	[5]
Total Past Due	101		105		118
Total Loans and Leases	1,896		1,978		1,821
90-Days past Due and Still Accruing	29		30		36
Consumer Portfolio Segment | Consumer Other Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases	319		348		500
30-89 Days Past Due	1		1		2
90 Days and Greater	1	[4]	1	[4]	60	[5]
Total Past Due	2		2		62
Total Loans and Leases	$ 321		$ 350		$ 562

[1] Excludes $67 of loans measured at fair value.

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

[3] Excludes $54 of loans measured at fair value.

[4] Includes accrual and nonaccrual loans and leases.

[5] Includes accrual and nonaccrual loans and leases

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

[7] Excludes $54 of residential mortgage loans measured at fair value, includes $1,039 of leveraged leases, net of unearned income.

[8] Excludes $67 of residential mortgage loans measured at fair value, and includes $1,027 of leveraged leases, net of unearned income.

[9] 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 March 31, 2012, $49 of these loans were 30-89 days past due and $320 were 90 days or more past due. The Bancorp recognized $1 of losses for the three months ended March 31, 2012 due to claim denials and curtailments associated with these advances.

[10] 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.

[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 March 31, 2011 $50 of these loans were 30-89 days past due and $298 were 90 days or more past due. The Bancorp recognized an immaterial amount of losses for the three months ended March 31, 2011 due to claim denials and curtailments associated with these advances.