Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class (Detail) - USD ($) $ in Millions		Sep. 30, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		$ 92,830	[1],[2]	$ 89,272	[3],[4]
Total Past Due		571	[1]	704	[3]
Total Loans and Leases		93,401	[1]	89,976	[3]
90-Days past Due and Still Accruing		70	[1]	87	[3]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		258	[1],[2]	297	[3],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		313	[1],[2]	407	[3],[4]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases		57,008		53,953
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		42,862	[2]	40,651	[4]
Total Past Due		86		114
Total Loans and Leases		42,948		40,765
90-Days past Due and Still Accruing		3
Commercial Portfolio Segment | Commercial and Industrial Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		26	[2]	29	[4]
Commercial Portfolio Segment | Commercial and Industrial Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		60	[2]	85	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		3,711	[2]	3,774	[4]
Total Past Due		48		60
Total Loans and Leases		3,759		3,834
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		10	[2]	7	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		38	[2]	53	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		3,262	[2]	3,537	[4]
Total Past Due		40		28
Total Loans and Leases		3,302		3,565
90-Days past Due and Still Accruing		2
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		19	[2]	11	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		21	[2]	17	[4]
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		3,101	[2]	2,069	[4]
Total Loans and Leases		3,101		2,069
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		3,896	[2]	3,717	[4]
Total Past Due		2		3
Total Loans and Leases		3,898		3,720
Commercial Portfolio Segment | Commercial Leases | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[4]			3
Commercial Portfolio Segment | Commercial Leases | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	[2]	2
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		13,092	[1],[2],[5]	12,109	[3],[4],[6]
Total Past Due		127	[1],[5]	172	[3],[6]
Total Loans and Leases		13,219	[1],[5]	12,281	[3],[6]
90-Days past Due and Still Accruing		40	[1],[5]	56	[3],[6]
Residential Mortgage | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		33	[1],[2],[5]	38	[3],[4],[6]
Residential Mortgage | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		94	[1],[2],[5]	134	[3],[4],[6]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		8,287	[2]	8,710	[4]
Total Past Due		140		176
Total Loans and Leases		8,427		8,886
Consumer Portfolio Segment | Home Equity | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		76	[2]	100	[4]
Consumer Portfolio Segment | Home Equity | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		64	[2]	76	[4]
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		11,751	[2]	11,953	[4]
Total Past Due		75		84
Total Loans and Leases		11,826		12,037
90-Days past Due and Still Accruing		8		8
Consumer Portfolio Segment | Automobile Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		64	[2]	74	[4]
Consumer Portfolio Segment | Automobile Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		11	[2]	10	[4]
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		2,178	[2]	2,335	[4]
Total Past Due		51		66
Total Loans and Leases		2,229		2,401
90-Days past Due and Still Accruing		17		23
Consumer Portfolio Segment | Credit Card | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		28	[2]	34	[4]
Consumer Portfolio Segment | Credit Card | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		23	[2]	32	[4]
Consumer Portfolio Segment | Other Consumer Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current Loans and Leases		690	[2]	417	[4]
Total Past Due		2		1
Total Loans and Leases		692		418
Consumer Portfolio Segment | Other Consumer Loans and Leases | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 2	[2]	$ 1	[4]

[1] Excludes $173 of residential mortgage loans measured at fair value.

[2] Includes accrual and nonaccrual loans and leases.

[3] Excludes $108 of residential mortgage loans measured at fair value.

[4] Includes accrual and nonaccrual loans and leases.

[5] Information for current residential mortgage loans includes loans whose repayments are insured by the FHA or guaranteed by the VA. As of September 30, 2015, $99 of these loans were 30-89 days past due and $337 were 90 days or more past due. The Bancorp recognized $2 and $6 of losses during the three and nine months ended September 30, 2015, respectively, due to claim denials and curtailments associated with these insured or guaranteed loans.

[6] Information for current residential mortgage loans includes loans whose repayments are insured by the FHA or guaranteed by the VA. As of December 31, 2014, $99 of these loans were 30-89 days past due and $373 were 90 days or more past due. The Bancorp recognized $2 and $9 of losses during the three and nine months ended September 30, 2014, respectively, due to claim denials and curtailments associated with these insured or guaranteed loans.