Credit Quality (Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class) (Detail) - USD ($) $ in Millions	Mar. 31, 2018		Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	$ 91,194	[1],[2]	$ 91,195	[3],[4]
Total Past Due	640	[2]	638	[4]
Total portfolio loans and leases	91,834	[2],[5]	91,833	[4],[6]
90-Days past Due and Still Accruing	107	[2]	97	[4]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	346	[1],[2]	333	[3],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	294	[1],[2]	305	[3],[4]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Total portfolio loans and leases	56,829		56,395
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	41,502	[1]	41,027	[3]
Total Past Due	133		143
Total portfolio loans and leases	41,635		41,170
90-Days past Due and Still Accruing	7		3
Commercial Portfolio Segment | Commercial and Industrial Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	46	[1]	42	[3]
Commercial Portfolio Segment | Commercial and Industrial Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	87	[1]	101	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,316	[1]	3,351	[3]
Total Past Due	14		11
Total portfolio loans and leases	3,330		3,362
90-Days past Due and Still Accruing	1		0
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	6	[1]	3	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	8	[1]	8	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,109	[1]	3,235	[3]
Total Past Due	70		7
Total portfolio loans and leases	3,179		3,242
90-Days past Due and Still Accruing	0		0
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	67	[1]	0	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	3	[1]	7	[3]
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	4,766	[1]	4,552	[3]
Total Past Due	0		1
Total portfolio loans and leases	4,766		4,553
90-Days past Due and Still Accruing	0		0
Commercial Portfolio Segment | Commercial Construction Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	0	[1]	1	[3]
Commercial Portfolio Segment | Commercial Construction Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	0	[1]	0	[3]
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,914	[1]	4,065	[3]
Total Past Due	5		3
Total portfolio loans and leases	3,919		4,068
90-Days past Due and Still Accruing	0		0
Commercial Portfolio Segment | Commercial Leases | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	0	[1]	3	[3]
Commercial Portfolio Segment | Commercial Leases | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	5	[1]	0	[3]
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	15,304	[1],[2],[7]	15,301	[3],[4],[8]
Total Past Due	123	[2],[7]	153	[4],[8]
Total portfolio loans and leases	15,427	[2],[7]	15,454	[4],[8]
90-Days past Due and Still Accruing	62	[2],[7]	57	[4],[8]
Residential Mortgage | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	32	[1],[2],[7]	66	[3],[4],[8]
Residential Mortgage | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	91	[1],[2],[7]	87	[3],[4],[8]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	6,636	[1]	6,888	[3]
Total Past Due	121		126
Total portfolio loans and leases	6,757		7,014
90-Days past Due and Still Accruing	0		0
Consumer Portfolio Segment | Home Equity | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	66	[1]	70	[3]
Consumer Portfolio Segment | Home Equity | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	55	[1]	56	[3]
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	8,927	[1]	8,992	[3]
Total Past Due	91		120
Total portfolio loans and leases	9,018		9,112
90-Days past Due and Still Accruing	9		10
Consumer Portfolio Segment | Automobile Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	81	[1]	107	[3]
Consumer Portfolio Segment | Automobile Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	10	[1]	13	[3]
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	2,115	[1]	2,230	[3]
Total Past Due	73		69
Total portfolio loans and leases	2,188		2,299
90-Days past Due and Still Accruing	28		27
Consumer Portfolio Segment | Credit Card | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	39	[1]	36	[3]
Consumer Portfolio Segment | Credit Card | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	34	[1]	33	[3]
Consumer Portfolio Segment | Other Consumer Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	1,605	[1]	1,554	[3]
Total Past Due	10		5
Total portfolio loans and leases	1,615		1,559
90-Days past Due and Still Accruing	0		0
Consumer Portfolio Segment | Other Consumer Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	9	[1]	5	[3]
Consumer Portfolio Segment | Other Consumer Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 1	[1]	$ 0	[3]

[1] Includes accrual and nonaccrual loans and leases.

[2] Excludes $ 136 of residential mortgage loans measured at fair value at March 31, 2018 .

[3] Includes accrual and nonaccrual loans and leases.

[4] Excludes $ 137 of residential mortgage loans measured at fair value at December 31, 2017 .

[5] Excludes $ 136 of residential mortgage loans measured at fair value and includes $ 670 of leveraged leases, net of unearned income at March 31, 2018 .

[6] Excludes $ 137 of residential mortga ge loans measured at fair value and includes $ 674 of leveraged leases, net of unearned income at December 31, 2017 .

[7] Information includes advances made pursuant to servicing agreements for GNMA mortgage pools whose repayments are insured by the FHA or guaranteed by the VA. A s of March 31, 2018 , $ 7 9 of these loans were 30-89 days past due and $ 317 were 90 days or more past due. The Bancorp recognized $ 2 of losses during the three months ended March 31, 2018 due to claim denials and curtailments associated with these insured or guaranteed loans.

[8] Information includes advances made pursuant to servicing agreements for GNMA mortgage pools whose repayments are insured by the FHA or guaranteed by the VA. As of December 31, 2017 , $ 95 of these loa ns were 30-89 days past due and $ 290 were 90 days or more p ast due. The Bancorp recognized $ 2 of losses during the three months ended March 31, 2017 due to claim denials and cu rtailments asso ciated with these insured or guaranteed loans.