Credit Quality (Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class) (Detail) - USD ($) $ in Millions	Jun. 30, 2018		Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	$ 91,238	[1],[2]	$ 91,195	[3],[4]
Total Past Due	532	[2]	638	[4]
Total portfolio loans and leases	91,770	[2],[5]	91,833	[4],[6]
90-Days past Due and Still Accruing	89	[2]	97	[4]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	241	[1],[2]	333	[3],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	291	[1],[2]	305	[3],[4]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Total portfolio loans and leases	56,503		56,395
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	41,281	[1]	41,027	[3]
Total Past Due	122		143
Total portfolio loans and leases	41,403		41,170
90-Days past Due and Still Accruing	4		3
Commercial Portfolio Segment | Commercial and Industrial Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	19	[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	103	[1]	101	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,384	[1]	3,351	[3]
Total Past Due	7		11
Total portfolio loans and leases	3,391		3,362
90-Days past Due and Still Accruing	0		0
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	1	[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	6	[1]	8	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,228	[1]	3,235	[3]
Total Past Due	6		7
Total portfolio loans and leases	3,234		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	3	[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	4,687	[1]	4,552	[3]
Total Past Due	0		1
Total portfolio loans and leases	4,687		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	3,784	[1]	4,065	[3]
Total Past Due	4		3
Total portfolio loans and leases	3,788		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	4	[1]	0	[3]
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	15,382	[1],[2],[7]	15,301	[3],[4],[8]
Total Past Due	96	[2],[7]	153	[4],[8]
Total portfolio loans and leases	15,478	[2],[7]	15,454	[4],[8]
90-Days past Due and Still Accruing	44	[2],[7]	57	[4],[8]
Residential Mortgage | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	24	[1],[2],[7]	66	[3],[4],[8]
Residential Mortgage | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	72	[1],[2],[7]	87	[3],[4],[8]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	6,482	[1]	6,888	[3]
Total Past Due	117		126
Total portfolio loans and leases	6,599		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	51	[1]	56	[3]
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	8,840	[1]	8,992	[3]
Total Past Due	98		120
Total portfolio loans and leases	8,938		9,112
90-Days past Due and Still Accruing	10		10
Consumer Portfolio Segment | Automobile Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	84	[1]	107	[3]
Consumer Portfolio Segment | Automobile Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	14	[1]	13	[3]
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	2,198	[1]	2,230	[3]
Total Past Due	72		69
Total portfolio loans and leases	2,270		2,299
90-Days past Due and Still Accruing	31		27
Consumer Portfolio Segment | Credit Card | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	36	[1]	36	[3]
Consumer Portfolio Segment | Credit Card | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	36	[1]	33	[3]
Consumer Portfolio Segment | Other Consumer Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	1,972	[1]	1,554	[3]
Total Past Due	10		5
Total portfolio loans and leases	1,982		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	8	[1]	5	[3]
Consumer Portfolio Segment | Other Consumer Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 2	[1]	$ 0	[3]

[1] Includes accrual and nonaccrual loans and leases.

[2] Excludes $ 162 of residential mortgage loans measured at fair value at June 30, 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 $ 162 of residential mortgage loans measured at fair value and includes $ 65 0 of leveraged leases, net of unearned income at June 30, 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 June 30, 2018 , $ 71 of these loans were 30-89 days past due and $ 237 were 90 days or more past due. The Bancorp recognized $ 1 and $ 3 of losses during the three and six months ended June 30, 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 $ 1 and $ 3 of losses during the three and six months ended June 30, 2017, respectively, due to c laim denials and cu rtailments associated with these insured or guaranteed loans.