Credit Quality (Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class) (Detail) - USD ($) $ in Millions	Dec. 31, 2017		Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	$ 91,195	[1],[2],[3]	$ 91,339	[4],[5],[6]
Total Past Due	638	[2]	616	[5]
Total portfolio loans and leases	91,833	[2]	91,955	[5]
90-Days past Due and Still Accruing	97	[2]	84	[5]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	333	[1],[2]	315	[4],[5]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	305	[1],[2]	301	[4],[5]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Total portfolio loans and leases	56,395		56,452
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	41,027	[1],[3]	41,495	[4],[6]
Total Past Due	143		181
Total portfolio loans and leases	41,170		41,676
90-Days past Due and Still Accruing	3		4
Commercial Portfolio Segment | Commercial and Industrial Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	42	[1]	87	[4]
Commercial Portfolio Segment | Commercial and Industrial Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	101	[1]	94	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,351	[1],[3]	3,332	[4],[6]
Total Past Due	11		28
Total portfolio loans and leases	3,362		3,360
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	3	[1]	6	[4]
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]	22	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,235	[1],[3]	3,530	[4],[6]
Total Past Due	7		9
Total portfolio loans and leases	3,242		3,539
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	0	[1]	2	[4]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	7	[1]	7	[4]
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	4,552	[1],[3]	3,902	[4],[6]
Total Past Due	1		1
Total portfolio loans and leases	4,553		3,903
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	1	[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	4,065	[1],[3]	3,972	[4],[6]
Total Past Due	3		2
Total portfolio loans and leases	4,068		3,974
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	3	[1]	0	[4]
Commercial Portfolio Segment | Commercial Leases | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	0	[1]	2	[4]
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	15,301	[1],[2],[3]	14,790	[4],[5],[6]
Total Past Due	153	[2]	118	[5]
Total portfolio loans and leases	15,454	[2]	14,908	[5]
90-Days past Due and Still Accruing	57	[2]	49	[5]
Residential Mortgage | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	66	[1],[2]	37	[4],[5]
Residential Mortgage | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	87	[1],[2]	81	[4],[5]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	6,888	[1],[3]	7,570	[4],[6]
Total Past Due	126		125
Total portfolio loans and leases	7,014		7,695
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	70	[1]	68	[4]
Consumer Portfolio Segment | Home Equity | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	56	[1]	57	[4]
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	8,992	[1],[3]	9,886	[4],[6]
Total Past Due	120		97
Total portfolio loans and leases	9,112		9,983
90-Days past Due and Still Accruing	10		9
Consumer Portfolio Segment | Automobile Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	107	[1]	85	[4]
Consumer Portfolio Segment | Automobile Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	13	[1]	12	[4]
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	2,230	[1],[3]	2,183	[4],[6]
Total Past Due	69		54
Total portfolio loans and leases	2,299		2,237
90-Days past Due and Still Accruing	27		22
Consumer Portfolio Segment | Credit Card | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	36	[1]	28	[4]
Consumer Portfolio Segment | Credit Card | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	33	[1]	26	[4]
Consumer Portfolio Segment | Other Consumer Loans and Leases
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	1,554	[1],[3]	679	[4],[6]
Total Past Due	5		1
Total portfolio loans and leases	1,559		680
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	5	[1]	1	[4]
Consumer Portfolio Segment | Other Consumer Loans and Leases | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	$ 0	[1]	$ 0	[4]

[1] Includes accrual and nonaccrual loans and leases.

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

[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. A s 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.

[4] Includes accrual and nonaccrual loans and leases .

[5] Excludes $ 143 of residential mortgage loans measured at fair value at December 31, 2016 .

[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 . A s of December 31, 2016 , $ 110 of these loans were 30-89 days past due and $ 312 were 90 days or more past due. The Bancorp recognized $ 6 of losses during the year ended December 31, 2016 due to claim denials and curtailments associated with these insured or guaranteed loans .