Credit Quality And Allowance For Credit Losses (Loans By Credit Quality Indicator and Vintage Year) (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		$ 53,458	$ 50,369
Financing Receivable, Originated in Current Fiscal Year		1,637
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		6,274
Financing Receivable, Originated Two Years before Latest Fiscal Year		5,163
Financing Receivable, Originated Three Years before Latest Fiscal Year		4,111
Financing Receivable, Originated Four Years before Latest Fiscal Year		2,591
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		5,753
Financing Receivable, Revolving		27,814
Financing Receivable, Revolving Converted to Term		115
Business loans | Commercial borrower
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		49,322	46,084
Financing Receivable, Originated in Current Fiscal Year		1,495
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		5,925
Financing Receivable, Originated Two Years before Latest Fiscal Year		4,959
Financing Receivable, Originated Three Years before Latest Fiscal Year		3,760
Financing Receivable, Originated Four Years before Latest Fiscal Year		2,293
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		5,045
Financing Receivable, Revolving		25,829
Financing Receivable, Revolving Converted to Term		16
Business loans | Commercial borrower | Domestic loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		34,249	31,473
Financing Receivable, Originated in Current Fiscal Year		651
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		3,055
Financing Receivable, Originated Two Years before Latest Fiscal Year		2,266
Financing Receivable, Originated Three Years before Latest Fiscal Year		1,487
Financing Receivable, Originated Four Years before Latest Fiscal Year		728
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		1,275
Financing Receivable, Revolving		24,771
Financing Receivable, Revolving Converted to Term		16
Business loans | Commercial borrower | Domestic loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[1]	32,238	29,785
Financing Receivable, Originated in Current Fiscal Year	[1]	634
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	2,829
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	2,069
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	1,386
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	636
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	1,143
Financing Receivable, Revolving	[1]	23,528
Financing Receivable, Revolving Converted to Term	[1]	13
Business loans | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[2]	962	841
Financing Receivable, Originated in Current Fiscal Year	[2]	12
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[2]	106
Financing Receivable, Originated Two Years before Latest Fiscal Year	[2]	72
Financing Receivable, Originated Three Years before Latest Fiscal Year	[2]	57
Financing Receivable, Originated Four Years before Latest Fiscal Year	[2]	41
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[2]	47
Financing Receivable, Revolving	[2]	627
Financing Receivable, Revolving Converted to Term	[2]	0
Business loans | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[3]	876	699
Financing Receivable, Originated in Current Fiscal Year	[3]	3
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[3]	109
Financing Receivable, Originated Two Years before Latest Fiscal Year	[3]	122
Financing Receivable, Originated Three Years before Latest Fiscal Year	[3]	24
Financing Receivable, Originated Four Years before Latest Fiscal Year	[3]	41
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[3]	32
Financing Receivable, Revolving	[3]	544
Financing Receivable, Revolving Converted to Term	[3]	1
Business loans | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[4]	173	148
Financing Receivable, Originated in Current Fiscal Year	[4]	2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[4]	11
Financing Receivable, Originated Two Years before Latest Fiscal Year	[4]	3
Financing Receivable, Originated Three Years before Latest Fiscal Year	[4]	20
Financing Receivable, Originated Four Years before Latest Fiscal Year	[4]	10
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[4]	53
Financing Receivable, Revolving	[3]	72
Financing Receivable, Revolving Converted to Term	[4]	2
Business loans | Commercial borrower | International loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		1,035	1,009
Financing Receivable, Originated in Current Fiscal Year		228
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		185
Financing Receivable, Originated Two Years before Latest Fiscal Year		166
Financing Receivable, Originated Three Years before Latest Fiscal Year		38
Financing Receivable, Originated Four Years before Latest Fiscal Year		5
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		76
Financing Receivable, Revolving		337
Financing Receivable, Revolving Converted to Term		0
Business loans | Commercial borrower | International loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[1]	989	972
Financing Receivable, Originated in Current Fiscal Year	[1]	228
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	185
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	161
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	34
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	1
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	74
Financing Receivable, Revolving	[1]	306
Financing Receivable, Revolving Converted to Term	[1]	0
Business loans | Commercial borrower | International loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[2]	40	29
Financing Receivable, Originated in Current Fiscal Year	[2]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[2]	4
Financing Receivable, Originated Three Years before Latest Fiscal Year	[2]	4
Financing Receivable, Originated Four Years before Latest Fiscal Year	[2]	4
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[2]	2
Financing Receivable, Revolving	[2]	26
Financing Receivable, Revolving Converted to Term	[2]	0
Business loans | Commercial borrower | International loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[3]	6	8
Financing Receivable, Originated in Current Fiscal Year	[3]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[3]	1
Financing Receivable, Originated Three Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[3]	0
Financing Receivable, Revolving	[3]	5
Financing Receivable, Revolving Converted to Term	[3]	0
Business loans | Real estate construction | Commercial borrower | Domestic loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		3,756	3,455
Financing Receivable, Originated in Current Fiscal Year		98
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		709
Financing Receivable, Originated Two Years before Latest Fiscal Year		1,141
Financing Receivable, Originated Three Years before Latest Fiscal Year		826
Financing Receivable, Originated Four Years before Latest Fiscal Year		527
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		220
Financing Receivable, Revolving		235
Financing Receivable, Revolving Converted to Term		0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[1]	3,723	3,424
Financing Receivable, Originated in Current Fiscal Year	[1]	98
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	709
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	1,140
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	812
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	527
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	220
Financing Receivable, Revolving	[1]	217
Financing Receivable, Revolving Converted to Term	[1]	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[2]	18	19
Financing Receivable, Originated in Current Fiscal Year	[2]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[2]	0
Financing Receivable, Revolving	[2]	18
Financing Receivable, Revolving Converted to Term	[2]	0
Business loans | Real estate construction | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[3]	15	12
Financing Receivable, Originated in Current Fiscal Year	[3]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[3]	1
Financing Receivable, Originated Three Years before Latest Fiscal Year	[3]	14
Financing Receivable, Originated Four Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[3]	0
Financing Receivable, Revolving	[3]	0
Financing Receivable, Revolving Converted to Term	[3]	0
Business loans | Commercial mortgage | Commercial borrower | Domestic loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		9,698	9,559
Financing Receivable, Originated in Current Fiscal Year		480
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		1,822
Financing Receivable, Originated Two Years before Latest Fiscal Year		1,294
Financing Receivable, Originated Three Years before Latest Fiscal Year		1,348
Financing Receivable, Originated Four Years before Latest Fiscal Year		1,013
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		3,255
Financing Receivable, Revolving		486
Financing Receivable, Revolving Converted to Term		0
Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[1]	9,408	9,262
Financing Receivable, Originated in Current Fiscal Year	[1]	472
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	1,769
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	1,274
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	1,323
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	975
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	3,114
Financing Receivable, Revolving	[1]	481
Financing Receivable, Revolving Converted to Term	[1]	0
Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[2]	165	159
Financing Receivable, Originated in Current Fiscal Year	[2]	6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[2]	46
Financing Receivable, Originated Two Years before Latest Fiscal Year	[2]	18
Financing Receivable, Originated Three Years before Latest Fiscal Year	[2]	13
Financing Receivable, Originated Four Years before Latest Fiscal Year	[2]	27
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[2]	50
Financing Receivable, Revolving	[2]	5
Financing Receivable, Revolving Converted to Term	[2]	0
Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[3]	106	124
Financing Receivable, Originated in Current Fiscal Year	[3]	2
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[3]	7
Financing Receivable, Originated Two Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[3]	11
Financing Receivable, Originated Four Years before Latest Fiscal Year	[3]	8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[3]	78
Financing Receivable, Revolving	[3]	0
Financing Receivable, Revolving Converted to Term	[3]	0
Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[4]	19	14
Financing Receivable, Originated in Current Fiscal Year	[4]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[4]	2
Financing Receivable, Originated Three Years before Latest Fiscal Year	[4]	1
Financing Receivable, Originated Four Years before Latest Fiscal Year	[4]	3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[4]	13
Financing Receivable, Revolving	[4]	0
Financing Receivable, Revolving Converted to Term	[4]	0
Business loans | Lease financing | Commercial borrower | Domestic loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		584	588
Financing Receivable, Originated in Current Fiscal Year		38
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		154
Financing Receivable, Originated Two Years before Latest Fiscal Year		92
Financing Receivable, Originated Three Years before Latest Fiscal Year		61
Financing Receivable, Originated Four Years before Latest Fiscal Year		20
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		219
Financing Receivable, Revolving		0
Financing Receivable, Revolving Converted to Term		0
Business loans | Lease financing | Commercial borrower | Domestic loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[1]	568	579
Financing Receivable, Originated in Current Fiscal Year	[1]	37
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	147
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	89
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	58
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	18
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	219
Financing Receivable, Revolving	[1]	0
Financing Receivable, Revolving Converted to Term	[1]	0
Business loans | Lease financing | Commercial borrower | Domestic loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[2]	13	7
Financing Receivable, Originated in Current Fiscal Year	[2]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[2]	6
Financing Receivable, Originated Two Years before Latest Fiscal Year	[2]	3
Financing Receivable, Originated Three Years before Latest Fiscal Year	[2]	2
Financing Receivable, Originated Four Years before Latest Fiscal Year	[2]	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[2]	0
Financing Receivable, Revolving	[2]	0
Financing Receivable, Revolving Converted to Term	[2]	0
Business loans | Lease financing | Commercial borrower | Domestic loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[3]	2	2
Financing Receivable, Originated in Current Fiscal Year	[3]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[3]	1
Financing Receivable, Originated Two Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[3]	1
Financing Receivable, Originated Four Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[3]	0
Financing Receivable, Revolving	[3]	0
Financing Receivable, Revolving Converted to Term	[3]	0
Business loans | Lease financing | Commercial borrower | Domestic loans | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[4]	1	0
Financing Receivable, Originated in Current Fiscal Year	[4]	1
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[4]	0
Financing Receivable, Revolving	[4]	0
Financing Receivable, Revolving Converted to Term	[4]	0
Retail loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		4,136	4,285
Financing Receivable, Originated in Current Fiscal Year		142
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		349
Financing Receivable, Originated Two Years before Latest Fiscal Year		204
Financing Receivable, Originated Three Years before Latest Fiscal Year		351
Financing Receivable, Originated Four Years before Latest Fiscal Year		298
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		708
Financing Receivable, Revolving		1,985
Financing Receivable, Revolving Converted to Term		99
Retail loans | Consumer borrower
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		2,315	2,440
Financing Receivable, Originated in Current Fiscal Year		6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		89
Financing Receivable, Originated Two Years before Latest Fiscal Year		29
Financing Receivable, Originated Three Years before Latest Fiscal Year		10
Financing Receivable, Originated Four Years before Latest Fiscal Year		11
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		86
Financing Receivable, Revolving		1,985
Financing Receivable, Revolving Converted to Term		99
Retail loans | Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		1,821	1,845
Financing Receivable, Originated in Current Fiscal Year		136
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		260
Financing Receivable, Originated Two Years before Latest Fiscal Year		175
Financing Receivable, Originated Three Years before Latest Fiscal Year		341
Financing Receivable, Originated Four Years before Latest Fiscal Year		287
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		622
Financing Receivable, Revolving		0
Financing Receivable, Revolving Converted to Term		0
Retail loans | Residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[1]	1,797	1,823
Financing Receivable, Originated in Current Fiscal Year	[1]	136
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	260
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	170
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	340
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	285
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	606
Financing Receivable, Revolving	[1]	0
Financing Receivable, Revolving Converted to Term	[1]	0
Retail loans | Residential mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[2]	4	2
Financing Receivable, Originated in Current Fiscal Year	[2]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[2]	4
Financing Receivable, Originated Three Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[2]	0
Financing Receivable, Revolving	[2]	0
Financing Receivable, Revolving Converted to Term	[2]	0
Retail loans | Residential mortgage | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[4]	20	20
Financing Receivable, Originated in Current Fiscal Year	[4]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[4]	1
Financing Receivable, Originated Three Years before Latest Fiscal Year	[4]	1
Financing Receivable, Originated Four Years before Latest Fiscal Year	[4]	2
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[4]	16
Financing Receivable, Revolving	[4]	0
Financing Receivable, Revolving Converted to Term	[4]	0
Retail loans | Home equity | Consumer borrower
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		1,727	1,711
Financing Receivable, Originated in Current Fiscal Year		0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		0
Financing Receivable, Originated Two Years before Latest Fiscal Year		0
Financing Receivable, Originated Three Years before Latest Fiscal Year		0
Financing Receivable, Originated Four Years before Latest Fiscal Year		0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		22
Financing Receivable, Revolving		1,606
Financing Receivable, Revolving Converted to Term		99
Retail loans | Home equity | Consumer borrower | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[1]	1,697	1,682
Financing Receivable, Originated in Current Fiscal Year	[1]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	21
Financing Receivable, Revolving	[1]	1,586
Financing Receivable, Revolving Converted to Term	[1]	90
Retail loans | Home equity | Consumer borrower | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[2]	1	1
Financing Receivable, Originated in Current Fiscal Year	[2]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[2]	0
Financing Receivable, Revolving	[2]	1
Financing Receivable, Revolving Converted to Term	[2]	0
Retail loans | Home equity | Consumer borrower | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[3]	7	11
Financing Receivable, Originated in Current Fiscal Year	[3]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[3]	0
Financing Receivable, Revolving	[3]	4
Financing Receivable, Revolving Converted to Term	[3]	3
Retail loans | Home equity | Consumer borrower | Nonaccrual
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[4]	22	17
Financing Receivable, Originated in Current Fiscal Year	[4]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[4]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[4]	1
Financing Receivable, Revolving	[4]	15
Financing Receivable, Revolving Converted to Term	[4]	6
Retail loans | Other consumer | Consumer borrower
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans		588	729
Financing Receivable, Originated in Current Fiscal Year		6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year		89
Financing Receivable, Originated Two Years before Latest Fiscal Year		29
Financing Receivable, Originated Three Years before Latest Fiscal Year		10
Financing Receivable, Originated Four Years before Latest Fiscal Year		11
Financing Receivable, Originated Five or More Years before Latest Fiscal Year		64
Financing Receivable, Revolving		379
Financing Receivable, Revolving Converted to Term		0
Retail loans | Other consumer | Consumer borrower | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[1]	581	722
Financing Receivable, Originated in Current Fiscal Year	[1]	6
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[1]	89
Financing Receivable, Originated Two Years before Latest Fiscal Year	[1]	28
Financing Receivable, Originated Three Years before Latest Fiscal Year	[1]	10
Financing Receivable, Originated Four Years before Latest Fiscal Year	[1]	11
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[1]	64
Financing Receivable, Revolving	[1]	373
Financing Receivable, Revolving Converted to Term	[1]	0
Retail loans | Other consumer | Consumer borrower | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[2]	7	6
Financing Receivable, Originated in Current Fiscal Year	[2]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[2]	1
Financing Receivable, Originated Three Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[2]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[2]	0
Financing Receivable, Revolving	[2]	6
Financing Receivable, Revolving Converted to Term	[2]	0
Retail loans | Other consumer | Consumer borrower | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	[3]	0	$ 1
Financing Receivable, Originated in Current Fiscal Year	[3]	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	[3]	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	[3]	0
Financing Receivable, Revolving	[3]	0
Financing Receivable, Revolving Converted to Term	[3]	$ 0

[1] Includes all loans not included in the categories of special mention, substandard or nonaccrual.

[2] Special mention loans are accruing loans that have potential credit weaknesses that deserve management’s close attention, such as loans to borrowers who may be experiencing financial difficulties that may result in deterioration of repayment prospects from the borrower at some future date. This category is generally consistent with the "special mention" category as defined by regulatory authorities.

[3] Substandard loans are accruing loans that have a well-defined weakness, or weaknesses, such as loans to borrowers who may be experiencing losses from operations or inadequate liquidity of a degree and duration that jeopardizes the orderly repayment of the loan. Substandard loans also are distinguished by the distinct possibility of loss in the future if these weaknesses are not corrected. This category is generally consistent with the "substandard" category as defined by regulatory authorities.

[4] Nonaccrual loans are loans for which the accrual of interest has been discontinued. For further information regarding nonaccrual loans, refer to the Nonperforming Assets subheading in Note 1 - Basis of Presentation and Accounting Policies - on page F-51 in the Corporation's 2019 Annual Report. A significant majority of nonaccrual loans are generally consistent with the "substandard" category and the remainder are generally consistent with the "doubtful" category as defined by regulatory authorities.