Credit Quality (Summary of the Credit Risk Profile of the Bancorp's Commercial Portfolio Segment by Class) (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Modifications
Total loans and leases	$ 117,852	$ 109,375
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Term Loans, 2020	1,615
Term Loans, 2019	5,928
Term Loans, 2018	4,049
Term Loans, 2017	2,905
Term Loans, 2016	1,986
Term Loans, prior year	4,178
Revolving loans amortized cost basis	57,334
Revolving loans converted to term loans amortized cost basis	0
Total	77,995
Total loans and leases	77,995	69,958
Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Term Loans, 2020	1,026
Term Loans, 2019	3,359
Term Loans, 2018	2,109
Term Loans, 2017	1,443
Term Loans, 2016	854
Term Loans, prior year	1,206
Revolving loans amortized cost basis	48,253
Revolving loans converted to term loans amortized cost basis	0
Total	58,250
Total loans and leases	58,250	50,542
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	316
Term Loans, 2019	995
Term Loans, 2018	705
Term Loans, 2017	543
Term Loans, 2016	348
Term Loans, prior year	793
Revolving loans amortized cost basis	1,185
Revolving loans converted to term loans amortized cost basis	0
Total	4,885
Total loans and leases	4,885	4,880
Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	242
Term Loans, 2019	1,302
Term Loans, 2018	754
Term Loans, 2017	381
Term Loans, 2016	348
Term Loans, prior year	640
Revolving loans amortized cost basis	2,608
Revolving loans converted to term loans amortized cost basis	0
Total	6,275
Total loans and leases	6,275	6,083
Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Term Loans, 2020	9
Term Loans, 2019	94
Term Loans, 2018	28
Term Loans, 2017	0
Term Loans, 2016	10
Term Loans, prior year	33
Revolving loans amortized cost basis	5,288
Revolving loans converted to term loans amortized cost basis	0
Total	5,462
Total loans and leases	5,462	5,090
Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Term Loans, 2020	22
Term Loans, 2019	178
Term Loans, 2018	453
Term Loans, 2017	538
Term Loans, 2016	426
Term Loans, prior year	1,506
Revolving loans amortized cost basis	0
Revolving loans converted to term loans amortized cost basis	0
Total	3,123
Total loans and leases	3,123	3,363
Pass | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Total loans and leases		66,143
Pass | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Term Loans, 2020	987
Term Loans, 2019	3,217
Term Loans, 2018	1,832
Term Loans, 2017	1,302
Term Loans, 2016	754
Term Loans, prior year	1,128
Revolving loans amortized cost basis	44,212
Revolving loans converted to term loans amortized cost basis	0
Total	53,432
Total loans and leases		47,671
Pass | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	297
Term Loans, 2019	903
Term Loans, 2018	624
Term Loans, 2017	474
Term Loans, 2016	322
Term Loans, prior year	730
Revolving loans amortized cost basis	1,052
Revolving loans converted to term loans amortized cost basis	0
Total	4,402
Total loans and leases		4,421
Pass | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	229
Term Loans, 2019	1,266
Term Loans, 2018	735
Term Loans, 2017	357
Term Loans, 2016	330
Term Loans, prior year	591
Revolving loans amortized cost basis	2,372
Revolving loans converted to term loans amortized cost basis	0
Total	5,880
Total loans and leases		5,866
Pass | Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Term Loans, 2020	9
Term Loans, 2019	90
Term Loans, 2018	28
Term Loans, 2017	0
Term Loans, 2016	10
Term Loans, prior year	29
Revolving loans amortized cost basis	5,075
Revolving loans converted to term loans amortized cost basis	0
Total	5,241
Total loans and leases		4,963
Pass | Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Term Loans, 2020	22
Term Loans, 2019	174
Term Loans, 2018	429
Term Loans, 2017	486
Term Loans, 2016	403
Term Loans, prior year	1,438
Revolving loans amortized cost basis	0
Revolving loans converted to term loans amortized cost basis	0
Total	2,952
Total loans and leases		3,222
Special Mention | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Total loans and leases		1,825
Special Mention | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Term Loans, 2020	28
Term Loans, 2019	89
Term Loans, 2018	188
Term Loans, 2017	63
Term Loans, 2016	42
Term Loans, prior year	8
Revolving loans amortized cost basis	2,631
Revolving loans converted to term loans amortized cost basis	0
Total	3,049
Total loans and leases		1,423
Special Mention | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	3
Term Loans, 2019	28
Term Loans, 2018	43
Term Loans, 2017	30
Term Loans, 2016	13
Term Loans, prior year	17
Revolving loans amortized cost basis	48
Revolving loans converted to term loans amortized cost basis	0
Total	182
Total loans and leases		162
Special Mention | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	4
Term Loans, 2019	9
Term Loans, 2018	17
Term Loans, 2017	13
Term Loans, 2016	18
Term Loans, prior year	6
Revolving loans amortized cost basis	151
Revolving loans converted to term loans amortized cost basis	0
Total	218
Total loans and leases		135
Special Mention | Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Term Loans, 2020	0
Term Loans, 2019	4
Term Loans, 2018	0
Term Loans, 2017	0
Term Loans, 2016	0
Term Loans, prior year	0
Revolving loans amortized cost basis	172
Revolving loans converted to term loans amortized cost basis	0
Total	176
Total loans and leases		52
Special Mention | Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Term Loans, 2020	0
Term Loans, 2019	1
Term Loans, 2018	17
Term Loans, 2017	34
Term Loans, 2016	11
Term Loans, prior year	36
Revolving loans amortized cost basis	0
Revolving loans converted to term loans amortized cost basis	0
Total	99
Total loans and leases		53
Substandard | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Total loans and leases		1,944
Substandard | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Term Loans, 2020	11
Term Loans, 2019	53
Term Loans, 2018	89
Term Loans, 2017	78
Term Loans, 2016	58
Term Loans, prior year	70
Revolving loans amortized cost basis	1,385
Revolving loans converted to term loans amortized cost basis	0
Total	1,744
Total loans and leases		1,406
Substandard | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	16
Term Loans, 2019	64
Term Loans, 2018	38
Term Loans, 2017	39
Term Loans, 2016	13
Term Loans, prior year	46
Revolving loans amortized cost basis	85
Revolving loans converted to term loans amortized cost basis	0
Total	301
Total loans and leases		293
Substandard | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	9
Term Loans, 2019	27
Term Loans, 2018	2
Term Loans, 2017	11
Term Loans, 2016	0
Term Loans, prior year	43
Revolving loans amortized cost basis	85
Revolving loans converted to term loans amortized cost basis	0
Total	177
Total loans and leases		82
Substandard | Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Term Loans, 2020	0
Term Loans, 2019	0
Term Loans, 2018	0
Term Loans, 2017	0
Term Loans, 2016	0
Term Loans, prior year	4
Revolving loans amortized cost basis	41
Revolving loans converted to term loans amortized cost basis	0
Total	45
Total loans and leases		75
Substandard | Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Term Loans, 2020	0
Term Loans, 2019	3
Term Loans, 2018	7
Term Loans, 2017	18
Term Loans, 2016	12
Term Loans, prior year	32
Revolving loans amortized cost basis	0
Revolving loans converted to term loans amortized cost basis	0
Total	72
Total loans and leases		88
Doubtful | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications
Total loans and leases		46
Doubtful | Commercial Portfolio Segment [Member] | Commercial and Industrial Loans
Financing Receivable, Modifications
Term Loans, 2020	0
Term Loans, 2019	0
Term Loans, 2018	0
Term Loans, 2017	0
Term Loans, 2016	0
Term Loans, prior year	0
Revolving loans amortized cost basis	25
Revolving loans converted to term loans amortized cost basis	0
Total	25
Total loans and leases		42
Doubtful | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Owner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	0
Term Loans, 2019	0
Term Loans, 2018	0
Term Loans, 2017	0
Term Loans, 2016	0
Term Loans, prior year	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans amortized cost basis	0
Total	0
Total loans and leases		4
Doubtful | Commercial Portfolio Segment [Member] | Commercial Mortgage Loans, Nonowner-Occupied
Financing Receivable, Modifications
Term Loans, 2020	0
Term Loans, 2019	0
Term Loans, 2018	0
Term Loans, 2017	0
Term Loans, 2016	0
Term Loans, prior year	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans amortized cost basis	0
Total	0
Total loans and leases		0
Doubtful | Commercial Portfolio Segment [Member] | Commercial Construction Loans
Financing Receivable, Modifications
Term Loans, 2020	0
Term Loans, 2019	0
Term Loans, 2018	0
Term Loans, 2017	0
Term Loans, 2016	0
Term Loans, prior year	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans amortized cost basis	0
Total	0
Total loans and leases		0
Doubtful | Commercial Portfolio Segment [Member] | Commercial Leases
Financing Receivable, Modifications
Term Loans, 2020	0
Term Loans, 2019	0
Term Loans, 2018	0
Term Loans, 2017	0
Term Loans, 2016	0
Term Loans, prior year	0
Revolving loans amortized cost basis	0
Revolving loans converted to term loans amortized cost basis	0
Total	$ 0
Total loans and leases		$ 0