Credit Quality (Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class) (Detail) - USD ($) $ in Millions	Mar. 31, 2017		Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	$ 90,963	[1],[2]	$ 91,339	[3],[4]
Total Past Due	524	[2]	616	[4]
Total portfolio loans and leases	91,487	[2],[5]	91,955	[4],[6]
90-Days past Due and Still Accruing	75	[2]	84	[4]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	229	[1],[2]	315	[3],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	295	[1],[2]	301	[3],[4]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Total portfolio loans and leases	56,373		56,452
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	40,930	[1]	41,495	[3]
Total Past Due	144		181
Total portfolio loans and leases	41,074		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	46	[1]	87	[3]
Commercial Portfolio Segment | Commercial and Industrial Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	98	[1]	94	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,388	[1]	3,332	[3]
Total Past Due	22		28
Total portfolio loans and leases	3,410		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	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-occupied | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	19	[1]	22	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,506	[1]	3,530	[3]
Total Past Due	8		9
Total portfolio loans and leases	3,514		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	1	[1]	2	[3]
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	[3]
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	4,283	[1]	3,902	[3]
Total Past Due	0		1
Total portfolio loans and leases	4,283		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	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	4,090	[1]	3,972	[3]
Total Past Due	2		2
Total portfolio loans and leases	4,092		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	0	[1]	0	[3]
Commercial Portfolio Segment | Commercial Leases | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	2	[1]	2	[3]
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	15,087	[1],[2],[7]	14,790	[3],[4],[8]
Total Past Due	108	[2],[7]	118	[4],[8]
Total portfolio loans and leases	15,195	[2],[7]	14,908	[4],[8]
90-Days past Due and Still Accruing	45	[2],[7]	49	[4],[8]
Residential Mortgage | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	27	[1],[2],[7]	37	[3],[4],[8]
Residential Mortgage | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	81	[1],[2],[7]	81	[3],[4],[8]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	7,351	[1]	7,570	[3]
Total Past Due	118		125
Total portfolio loans and leases	7,469		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	64	[1]	68	[3]
Consumer Portfolio Segment | Home Equity | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	54	[1]	57	[3]
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	9,503	[1]	9,886	[3]
Total Past Due	69		97
Total portfolio loans and leases	9,572		9,983
90-Days past Due and Still Accruing	6		9
Consumer Portfolio Segment | Automobile Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	60	[1]	85	[3]
Consumer Portfolio Segment | Automobile Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	9	[1]	12	[3]
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	2,018	[1]	2,183	[3]
Total Past Due	52		54
Total portfolio loans and leases	2,070		2,237
90-Days past Due and Still Accruing	21		22
Consumer Portfolio Segment | Credit Card | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	27	[1]	28	[3]
Consumer Portfolio Segment | Credit Card | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	25	[1]	26	[3]
Consumer Portfolio Segment | Other Consumer Loans and Leases
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	807	[1]	679	[3]
Total Past Due	1		1
Total portfolio loans and leases	808		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	1	[1]	1	[3]
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	[3]

[1] Includes accrual and nonaccrual loans and leases.

[2] Excludes $ 141 of residential mortgage loans measured at fair value at March 31, 2017 .

[3] Includes accrual and nonaccrual loans and leases.

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

[5] Excludes $ 141 of residential mortgage loans measured at fair value, and includes $ 7 03 of leveraged leases, net of unearned income at March 31, 2017 .

[6] Excludes $ 143 of residential mortgage loans measured at fair value, and includes $ 701 of leveraged leases, net of unearned income at December 31, 2016 .

[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. As of March 31, 2017 , $ 77 of these loans were 30-89 days past due and $ 302 were 90 days or more past due. The Bancorp recognized $ 2 of losses during the three months ended March 31, 2017 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 , 2016 , $ 110 of these loa ns were 30-89 days past due and $ 312 were 90 days or more past due. The Bancorp recognized $ 2 o f losses during the three months ended March 31, 2016 due to claim denials and cu rtailments associated with these insured or guaranteed loans .