Credit Quality (Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class) (Detail) - USD ($) $ in Millions	Dec. 31, 2018		Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	$ 94,487	[1],[2],[3]	$ 91,195	[4],[5],[6]
Total Past Due	599	[2]	638	[5]
Total portfolio loans and leases	95,086	[2]	91,833	[5]
90-Days past Due and Still Accruing	93	[2]	97	[5]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	326	[1],[2]	333	[4],[5]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	273	[1],[2]	305	[4],[5]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Total portfolio loans and leases	59,571		56,395
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	44,213	[1],[3]	41,027	[4],[6]
Total Past Due	127		143
Total portfolio loans and leases	44,340		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	32	[1]	42	[4]
Commercial Portfolio Segment | Commercial and Industrial Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	95	[1]	101	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,277	[1],[3]	3,351	[4],[6]
Total Past Due	7		11
Total portfolio loans and leases	3,284		3,362
90-Days past Due and Still Accruing	2		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	[4]
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	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,688	[1],[3]	3,235	[4],[6]
Total Past Due	2		7
Total portfolio loans and leases	3,690		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	1	[1]	0	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	1	[1]	7	[4]
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	4,657	[1],[3]	4,552	[4],[6]
Total Past Due	0		1
Total portfolio loans and leases	4,657		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	[4]
Commercial Portfolio Segment | Commercial Construction Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	0	[1]	0	[4]
Commercial Portfolio Segment | Commercial Leases
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,597	[1],[3]	4,065	[4],[6]
Total Past Due	3		3
Total portfolio loans and leases	3,600		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	1	[1]	3	[4]
Commercial Portfolio Segment | Commercial Leases | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	2	[1]	0	[4]
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	15,227	[1],[2],[3]	15,301	[4],[5],[6]
Total Past Due	98	[2]	153	[5]
Total portfolio loans and leases	15,325	[2]	15,454	[5]
90-Days past Due and Still Accruing	38	[2]	57	[5]
Residential Mortgage | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	37	[1],[2]	66	[4],[5]
Residential Mortgage | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	61	[1],[2]	87	[4],[5]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	6,280	[1],[3]	6,888	[4],[6]
Total Past Due	122		126
Total portfolio loans and leases	6,402		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	71	[1]	70	[4]
Consumer Portfolio Segment | Home Equity | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	51	[1]	56	[4]
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	8,844	[1],[3]	8,992	[4],[6]
Total Past Due	132		120
Total portfolio loans and leases	8,976		9,112
90-Days past Due and Still Accruing	12		10
Consumer Portfolio Segment | Automobile Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	119	[1]	107	[4]
Consumer Portfolio Segment | Automobile Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	13	[1]	13	[4]
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	2,381	[1],[3]	2,230	[4],[6]
Total Past Due	89		69
Total portfolio loans and leases	2,470		2,299
90-Days past Due and Still Accruing	37		27
Consumer Portfolio Segment | Credit Card | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	47	[1]	36	[4]
Consumer Portfolio Segment | Credit Card | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	42	[1]	33	[4]
Consumer Portfolio Segment | Other Consumer Loans and Leases
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	2,323	[1],[3]	1,554	[4],[6]
Total Past Due	19		5
Total portfolio loans and leases	2,342		1,559
90-Days past Due and Still Accruing	0		0
Consumer Portfolio Segment | Other Consumer Loans and Leases | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	17	[1]	5	[4]
Consumer Portfolio Segment | Other Consumer Loans and Leases | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 2	[1]	$ 0	[4]

[1] Includes accrual and nonaccrual loans and leases.

[2] Excludes $ 179 of residential mortgage loans measured at fair value at December 31, 2018 .

[3] 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, 2018 , $ 90 of these loans were 30-89 days past due and $ 195 w ere 90 days or more past due. The Bancorp recognized $ 5 o f losses during the year ended December 31, 2018 due to claim denials and curtailments as sociated with these insured or guaranteed loans.

[4] Includes accrual and nonaccrual loans and leases .

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

[6] 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 loans were 30-89 days past due and $ 290 were 90 days or more past due. The Bancorp recognized $ 5 of losses during the year ended December 31, 2017 due to claim denials and curtailments a ssociated with these insured or guaranteed loans .