Credit Quality (Summarizes the Bancorp's Recorded Investment in Portfolio Loans and Leases by Age and Class) (Detail) - USD ($) $ in Millions	Dec. 31, 2016		Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	$ 91,339	[1],[2]	$ 91,780	[3],[4]
Total Past Due	616	[2]	635	[4]
Total portfolio loans and leases	91,955	[2]	92,415	[4]
90-Days past Due and Still Accruing	84	[2]	75	[4]
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	315	[1],[2]	306	[3],[4]
90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	301	[1],[2]	329	[3],[4]
Commercial Portfolio Segment
Financing Receivable, Recorded Investment, Past Due
Total portfolio loans and leases	56,452		56,156
Commercial Portfolio Segment | Commercial and Industrial Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	41,495	[1]	41,996	[3]
Total Past Due	181		135
Total portfolio loans and leases	41,676		42,131
90-Days past Due and Still Accruing	4		7
Commercial Portfolio Segment | Commercial and Industrial Loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	87	[1]	55	[3]
Commercial Portfolio Segment | Commercial and Industrial Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	94	[1]	80	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,332	[1]	3,610	[3]
Total Past Due	28		49
Total portfolio loans and leases	3,360		3,659
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	6	[1]	15	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Owner-Occupied | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	22	[1]	34	[3]
Commercial Portfolio Segment | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,530	[1]	3,262	[3]
Total Past Due	9		36
Total portfolio loans and leases	3,539		3,298
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	2	[1]	9	[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]	27	[3]
Commercial Portfolio Segment | Commercial Construction Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	3,902	[1]	3,214	[3]
Total Past Due	1		0
Total portfolio loans and leases	3,903		3,214
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]	0	[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	3,972	[1]	3,850	[3]
Total Past Due	2		4
Total portfolio loans and leases	3,974		3,854
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	2	[1]	1	[3]
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	14,790	[1],[2],[5]	13,420	[3],[4],[6]
Total Past Due	118	[2],[5]	129	[4],[6]
Total portfolio loans and leases	14,908	[2],[5]	13,549	[4],[6]
90-Days past Due and Still Accruing	49	[2],[5]	40	[4],[6]
Residential Mortgage | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	37	[1],[2],[5]	37	[3],[4],[6]
Residential Mortgage | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	81	[1],[2],[5]	92	[3],[4],[6]
Consumer Portfolio Segment | Home Equity
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	7,570	[1]	8,158	[3]
Total Past Due	125		143
Total portfolio loans and leases	7,695		8,301
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	68	[1]	82	[3]
Consumer Portfolio Segment | Home Equity | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	57	[1]	61	[3]
Consumer Portfolio Segment | Automobile Loans
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	9,886	[1]	11,407	[3]
Total Past Due	97		86
Total portfolio loans and leases	9,983		11,493
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	85	[1]	75	[3]
Consumer Portfolio Segment | Automobile Loans | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	12	[1]	11	[3]
Consumer Portfolio Segment | Credit Card
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	2,183	[1]	2,207	[3]
Total Past Due	54		52
Total portfolio loans and leases	2,237		2,259
90-Days past Due and Still Accruing	22		18
Consumer Portfolio Segment | Credit Card | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	28	[1]	29	[3]
Consumer Portfolio Segment | Credit Card | 90 Days and Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Total Past Due	26	[1]	23	[3]
Consumer Portfolio Segment | Other Consumer Loans and Leases
Financing Receivable, Recorded Investment, Past Due
Current Loans and Leases	679	[1]	656	[3]
Total Past Due	1		1
Total portfolio loans and leases	680		657
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 $ 143 of residential mortgage loans measured at fair value at December 31, 2016 .

[3] Includes accrual and nonaccrual loans and leases .

[4] Excludes $ 167 of residential mortgage loans measured at fair value at December 31, 2015 .

[5] 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 , $ 1 1 0 of these loans were 30-89 days past due and $ 3 12 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 a ssociated with these insured or guaranteed loans.

[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, 2015 , $ 102 of these loans were 30-89 days past due and $ 335 were 90 days or more past due. The Bancorp recognized $ 8 of losses during the year ended December 31, 2015 due to claim denials and curtailments associated with these insured or guaranteed loans .