Credit Quality And Allowance For Credit Losses (Loans By Credit Quality Indicator and Vintage Year) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	$ 4,214	$ 9,268
Financing receivable, year two originated, fiscal year before current fiscal year	9,256	8,160
Financing receivable, year three, originated, two years before current fiscal year	7,784	4,120
Financing receivable, year four, originated, three years before current fiscal year	3,756	2,992
Financing receivable, year five, originated, four years before current fiscal year	2,605	1,960
Prior	4,891	3,961
Revolvers	23,201	22,889
Revolvers Converted to Term	57	52
Total loans	55,764	53,402
Business loans: | Commercial
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	4,010	8,868
Financing receivable, year two originated, fiscal year before current fiscal year	8,904	7,724
Financing receivable, year three, originated, two years before current fiscal year	7,363	3,590
Financing receivable, year four, originated, three years before current fiscal year	3,280	2,841
Financing receivable, year five, originated, four years before current fiscal year	2,462	1,890
Prior	4,459	3,548
Revolvers	21,127	20,806
Revolvers Converted to Term	12	10
Total loans	51,617	49,277
Business loans: | Commercial | Domestic
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	2,319	4,021
Financing receivable, year two originated, fiscal year before current fiscal year	3,636	3,783
Financing receivable, year three, originated, two years before current fiscal year	3,204	998
Financing receivable, year four, originated, three years before current fiscal year	823	1,110
Financing receivable, year five, originated, four years before current fiscal year	867	643
Prior	1,308	1,108
Revolvers	19,576	19,236
Revolvers Converted to Term	12	10
Total loans	31,745	30,909
Total gross charge-offs
Financing receivable, year one originated, gross charge-offs	0
Financing receivable, year two originated, gross charge-offs	2
Financing receivable, year three originated, gross charge-offs	2
Financing receivable, year four originated, gross charge-offs	1
Financing receivable, year five originated, gross charge-offs	2
Prior	10
Revolvers	3
Revolvers Converted to Term	0
Total	20
Business loans: | Commercial | Domestic | Pass
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	2,304	3,946
Financing receivable, year two originated, fiscal year before current fiscal year	3,532	3,509
Financing receivable, year three, originated, two years before current fiscal year	2,931	917
Financing receivable, year four, originated, three years before current fiscal year	775	1,041
Financing receivable, year five, originated, four years before current fiscal year	760	598
Prior	1,223	1,030
Revolvers	18,699	18,604
Revolvers Converted to Term	10	9
Total loans	30,234	29,654
Business loans: | Commercial | Domestic | Criticized
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	15	75
Financing receivable, year two originated, fiscal year before current fiscal year	104	274
Financing receivable, year three, originated, two years before current fiscal year	273	81
Financing receivable, year four, originated, three years before current fiscal year	48	69
Financing receivable, year five, originated, four years before current fiscal year	107	45
Prior	85	78
Revolvers	877	632
Revolvers Converted to Term	2	1
Total loans	1,511	1,255
Business loans: | Commercial | International
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	345	329
Financing receivable, year two originated, fiscal year before current fiscal year	159	161
Financing receivable, year three, originated, two years before current fiscal year	124	58
Financing receivable, year four, originated, three years before current fiscal year	45	88
Financing receivable, year five, originated, four years before current fiscal year	71	22
Prior	35	24
Revolvers	503	515
Revolvers Converted to Term	0	0
Total loans	1,282	1,197
Total gross charge-offs
Financing receivable, year one originated, gross charge-offs	1
Financing receivable, year two originated, gross charge-offs	0
Financing receivable, year three originated, gross charge-offs	0
Financing receivable, year four originated, gross charge-offs	0
Financing receivable, year five originated, gross charge-offs	0
Prior	0
Revolvers	0
Revolvers Converted to Term	0
Total	1
Business loans: | Commercial | International | Pass
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	344	317
Financing receivable, year two originated, fiscal year before current fiscal year	156	161
Financing receivable, year three, originated, two years before current fiscal year	119	55
Financing receivable, year four, originated, three years before current fiscal year	44	88
Financing receivable, year five, originated, four years before current fiscal year	71	19
Prior	24	14
Revolvers	487	498
Revolvers Converted to Term	0	0
Total loans	1,245	1,152
Business loans: | Commercial | International | Criticized
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	1	12
Financing receivable, year two originated, fiscal year before current fiscal year	3	0
Financing receivable, year three, originated, two years before current fiscal year	5	3
Financing receivable, year four, originated, three years before current fiscal year	1	0
Financing receivable, year five, originated, four years before current fiscal year	0	3
Prior	11	10
Revolvers	16	17
Revolvers Converted to Term	0	0
Total loans	37	45
Business loans: | Commercial | Real estate construction: | Domestic
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	181	836
Financing receivable, year two originated, fiscal year before current fiscal year	1,430	1,134
Financing receivable, year three, originated, two years before current fiscal year	1,481	636
Financing receivable, year four, originated, three years before current fiscal year	474	162
Financing receivable, year five, originated, four years before current fiscal year	115	102
Prior	53	28
Revolvers	249	207
Revolvers Converted to Term	0	0
Total loans	3,983	3,105
Total gross charge-offs
Financing receivable, year one originated, gross charge-offs	0
Financing receivable, year two originated, gross charge-offs	0
Financing receivable, year three originated, gross charge-offs	0
Financing receivable, year four originated, gross charge-offs	0
Financing receivable, year five originated, gross charge-offs	0
Prior	0
Revolvers	0
Revolvers Converted to Term	0
Total	0
Business loans: | Commercial | Real estate construction: | Domestic | Pass
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	181	836
Financing receivable, year two originated, fiscal year before current fiscal year	1,401	1,134
Financing receivable, year three, originated, two years before current fiscal year	1,473	633
Financing receivable, year four, originated, three years before current fiscal year	472	162
Financing receivable, year five, originated, four years before current fiscal year	115	102
Prior	53	28
Revolvers	249	207
Revolvers Converted to Term	0	0
Total loans	3,944	3,102
Business loans: | Commercial | Real estate construction: | Domestic | Criticized
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two originated, fiscal year before current fiscal year	29	0
Financing receivable, year three, originated, two years before current fiscal year	8	3
Financing receivable, year four, originated, three years before current fiscal year	2	0
Financing receivable, year five, originated, four years before current fiscal year	0	0
Prior	0	0
Revolvers	0	0
Revolvers Converted to Term	0	0
Total loans	39	3
Business loans: | Commercial | Commercial mortgage: | Domestic
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	1,058	3,356
Financing receivable, year two originated, fiscal year before current fiscal year	3,395	2,506
Financing receivable, year three, originated, two years before current fiscal year	2,430	1,832
Financing receivable, year four, originated, three years before current fiscal year	1,880	1,426
Financing receivable, year five, originated, four years before current fiscal year	1,361	1,081
Prior	2,928	2,257
Revolvers	799	848
Revolvers Converted to Term	0	0
Total loans	13,851	13,306
Total gross charge-offs
Financing receivable, year one originated, gross charge-offs	0
Financing receivable, year two originated, gross charge-offs	0
Financing receivable, year three originated, gross charge-offs	0
Financing receivable, year four originated, gross charge-offs	0
Financing receivable, year five originated, gross charge-offs	0
Prior	0
Revolvers	0
Revolvers Converted to Term	0
Total	0
Business loans: | Commercial | Commercial mortgage: | Domestic | Pass
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	1,058	3,349
Financing receivable, year two originated, fiscal year before current fiscal year	3,316	2,501
Financing receivable, year three, originated, two years before current fiscal year	2,390	1,825
Financing receivable, year four, originated, three years before current fiscal year	1,867	1,394
Financing receivable, year five, originated, four years before current fiscal year	1,275	1,050
Prior	2,780	2,182
Revolvers	798	838
Revolvers Converted to Term	0	0
Total loans	13,484	13,139
Business loans: | Commercial | Commercial mortgage: | Domestic | Criticized
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	0	7
Financing receivable, year two originated, fiscal year before current fiscal year	79	5
Financing receivable, year three, originated, two years before current fiscal year	40	7
Financing receivable, year four, originated, three years before current fiscal year	13	32
Financing receivable, year five, originated, four years before current fiscal year	86	31
Prior	148	75
Revolvers	1	10
Revolvers Converted to Term	0	0
Total loans	367	167
Business loans: | Commercial | Lease financing | Domestic
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	107	326
Financing receivable, year two originated, fiscal year before current fiscal year	284	140
Financing receivable, year three, originated, two years before current fiscal year	124	66
Financing receivable, year four, originated, three years before current fiscal year	58	55
Financing receivable, year five, originated, four years before current fiscal year	48	42
Prior	135	131
Revolvers	0	0
Revolvers Converted to Term	0	0
Total loans	756	760
Total gross charge-offs
Financing receivable, year one originated, gross charge-offs	0
Financing receivable, year two originated, gross charge-offs	0
Financing receivable, year three originated, gross charge-offs	0
Financing receivable, year four originated, gross charge-offs	0
Financing receivable, year five originated, gross charge-offs	0
Prior	0
Revolvers	0
Revolvers Converted to Term	0
Total	0
Business loans: | Commercial | Lease financing | Domestic | Pass
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	102	316
Financing receivable, year two originated, fiscal year before current fiscal year	275	140
Financing receivable, year three, originated, two years before current fiscal year	121	64
Financing receivable, year four, originated, three years before current fiscal year	56	47
Financing receivable, year five, originated, four years before current fiscal year	41	37
Prior	129	130
Revolvers	0	0
Revolvers Converted to Term	0	0
Total loans	724	734
Business loans: | Commercial | Lease financing | Domestic | Criticized
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	5	10
Financing receivable, year two originated, fiscal year before current fiscal year	9	0
Financing receivable, year three, originated, two years before current fiscal year	3	2
Financing receivable, year four, originated, three years before current fiscal year	2	8
Financing receivable, year five, originated, four years before current fiscal year	7	5
Prior	6	1
Revolvers	0	0
Revolvers Converted to Term	0	0
Total loans	32	26
Retail loans:
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	204	400
Financing receivable, year two originated, fiscal year before current fiscal year	352	436
Financing receivable, year three, originated, two years before current fiscal year	421	530
Financing receivable, year four, originated, three years before current fiscal year	476	151
Financing receivable, year five, originated, four years before current fiscal year	143	70
Prior	432	413
Revolvers	2,074	2,083
Revolvers Converted to Term	45	42
Total loans	4,147	4,125
Retail loans: | Residential mortgage
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	181	331
Financing receivable, year two originated, fiscal year before current fiscal year	308	398
Financing receivable, year three, originated, two years before current fiscal year	389	480
Financing receivable, year four, originated, three years before current fiscal year	467	142
Financing receivable, year five, originated, four years before current fiscal year	136	69
Prior	413	394
Revolvers	0	0
Revolvers Converted to Term	0	0
Total loans	1,894	1,814
Total gross charge-offs
Financing receivable, year one originated, gross charge-offs	0
Financing receivable, year two originated, gross charge-offs	0
Financing receivable, year three originated, gross charge-offs	0
Financing receivable, year four originated, gross charge-offs	0
Financing receivable, year five originated, gross charge-offs	0
Prior	0
Revolvers	0
Revolvers Converted to Term	0
Total	0
Retail loans: | Residential mortgage | Pass
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	180	327
Financing receivable, year two originated, fiscal year before current fiscal year	306	398
Financing receivable, year three, originated, two years before current fiscal year	388	480
Financing receivable, year four, originated, three years before current fiscal year	467	133
Financing receivable, year five, originated, four years before current fiscal year	135	68
Prior	385	355
Revolvers	0	0
Revolvers Converted to Term	0	0
Total loans	1,861	1,761
Retail loans: | Residential mortgage | Criticized
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	1	4
Financing receivable, year two originated, fiscal year before current fiscal year	2	0
Financing receivable, year three, originated, two years before current fiscal year	1	0
Financing receivable, year four, originated, three years before current fiscal year	0	9
Financing receivable, year five, originated, four years before current fiscal year	1	1
Prior	28	39
Revolvers	0	0
Revolvers Converted to Term	0	0
Total loans	33	53
Retail loans: | Consumer
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	23	69
Financing receivable, year two originated, fiscal year before current fiscal year	44	38
Financing receivable, year three, originated, two years before current fiscal year	32	50
Financing receivable, year four, originated, three years before current fiscal year	9	9
Financing receivable, year five, originated, four years before current fiscal year	7	1
Prior	19	19
Revolvers	2,074	2,083
Revolvers Converted to Term	45	42
Total loans	2,253	2,311
Retail loans: | Consumer | Home equity
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	0	0
Financing receivable, year four, originated, three years before current fiscal year	0	0
Financing receivable, year five, originated, four years before current fiscal year	0	0
Prior	8	9
Revolvers	1,719	1,725
Revolvers Converted to Term	45	42
Total loans	1,772	1,776
Total gross charge-offs
Financing receivable, year one originated, gross charge-offs	0
Financing receivable, year two originated, gross charge-offs	0
Financing receivable, year three originated, gross charge-offs	0
Financing receivable, year four originated, gross charge-offs	0
Financing receivable, year five originated, gross charge-offs	0
Prior	0
Revolvers	1
Revolvers Converted to Term	0
Total	1
Retail loans: | Consumer | Home equity | Pass
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	0	0
Financing receivable, year four, originated, three years before current fiscal year	0	0
Financing receivable, year five, originated, four years before current fiscal year	0	0
Prior	8	9
Revolvers	1,698	1,708
Revolvers Converted to Term	42	40
Total loans	1,748	1,757
Retail loans: | Consumer | Home equity | Criticized
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	0	0
Financing receivable, year four, originated, three years before current fiscal year	0	0
Financing receivable, year five, originated, four years before current fiscal year	0	0
Prior	0	0
Revolvers	21	17
Revolvers Converted to Term	3	2
Total loans	24	19
Retail loans: | Consumer | Other consumer
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	23	69
Financing receivable, year two originated, fiscal year before current fiscal year	44	38
Financing receivable, year three, originated, two years before current fiscal year	32	50
Financing receivable, year four, originated, three years before current fiscal year	9	9
Financing receivable, year five, originated, four years before current fiscal year	7	1
Prior	11	10
Revolvers	355	358
Revolvers Converted to Term	0	0
Total loans	481	535
Total gross charge-offs
Financing receivable, year one originated, gross charge-offs	0
Financing receivable, year two originated, gross charge-offs	0
Financing receivable, year three originated, gross charge-offs	0
Financing receivable, year four originated, gross charge-offs	0
Financing receivable, year five originated, gross charge-offs	1
Prior	0
Revolvers	0
Revolvers Converted to Term	0
Total	1
Retail loans: | Consumer | Other consumer | Pass
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	23	69
Financing receivable, year two originated, fiscal year before current fiscal year	44	38
Financing receivable, year three, originated, two years before current fiscal year	32	50
Financing receivable, year four, originated, three years before current fiscal year	9	8
Financing receivable, year five, originated, four years before current fiscal year	7	1
Prior	8	10
Revolvers	353	355
Revolvers Converted to Term	0	0
Total loans	476	531
Retail loans: | Consumer | Other consumer | Criticized
Loans by Credit Quality Indicator and Vintage Year
Financing receivable, year one, originated, current fiscal year	0	0
Financing receivable, year two originated, fiscal year before current fiscal year	0	0
Financing receivable, year three, originated, two years before current fiscal year	0	0
Financing receivable, year four, originated, three years before current fiscal year	0	1
Financing receivable, year five, originated, four years before current fiscal year	0	0
Prior	3	0
Revolvers	2	3
Revolvers Converted to Term	0	0
Total loans	$ 5	$ 4