Asset Quality - Schedule of Commercial Credit Exposure (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 119,011	$ 119,394
Accrued interest	500	417
Total commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current	4,369
Writeoff, current period	0
One year prior	17,672	18,203
Writeoff, one year period	0
Two years prior	13,077	14,465
Writeoff, two year period	5
Three years prior	4,884	5,657
Writeoff, three year period	5
Four years prior	4,908	5,678
Writeoff, four year period	1
Five years prior		3,213
Prior	8,744
Writeoff, prior	16
Prior		7,310
Revolving Loans Amortized Cost Basis	28,652	27,707
Writeoff, Revolving Loans Amortized Cost Basis	25
Revolving Loans Converted to Term Loans Amortized Cost Basis	248	232
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0
Total	82,554	82,465
Writeoff, total	52
Accrued interest	365	314
Total commercial loans | Commercial and Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current	3,277
Writeoff, current period	0
One year prior	11,161	11,654
Writeoff, one year period	0
Two years prior	7,747	8,995
Writeoff, two year period	5
Three years prior	3,218	3,676
Writeoff, three year period	4
Four years prior	2,515	3,003
Writeoff, four year period	1
Five years prior		2,036
Prior	4,479
Writeoff, prior	7
Prior		3,532
Revolving Loans Amortized Cost Basis	27,490	26,588
Writeoff, Revolving Loans Amortized Cost Basis	25
Revolving Loans Converted to Term Loans Amortized Cost Basis	172	163
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0
Total	60,059	59,647
Writeoff, total	42
Total commercial loans | Commercial and Industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	3,242
One year prior	10,905	11,580
Two years prior	7,306	8,636
Three years prior	3,039	3,540
Four years prior	2,367	2,839
Five years prior		1,787
Prior	4,060
Prior		3,307
Revolving Loans Amortized Cost Basis	26,548	25,565
Revolving Loans Converted to Term Loans Amortized Cost Basis	152	138
Total	57,619	57,392
Total commercial loans | Commercial and Industrial | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	31
One year prior	222	40
Two years prior	436	357
Three years prior	176	131
Four years prior	114	160
Five years prior		227
Prior	396
Prior		205
Revolving Loans Amortized Cost Basis	857	936
Revolving Loans Converted to Term Loans Amortized Cost Basis	20	25
Total	2,252	2,081
Total commercial loans | Commercial and Industrial | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	4
One year prior	34	34
Two years prior	5	2
Three years prior	3	5
Four years prior	34	4
Five years prior		22
Prior	23
Prior		20
Revolving Loans Amortized Cost Basis	85	87
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	188	174
Total commercial loans | Commercial mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Current	722
Writeoff, current period	0
One year prior	4,622	4,792
Writeoff, one year period	0
Two years prior	3,647	3,830
Writeoff, two year period	0
Three years prior	889	1,013
Writeoff, three year period	1
Four years prior	1,792	1,902
Writeoff, four year period	0
Five years prior		862
Prior	3,157
Writeoff, prior	8
Prior		2,768
Revolving Loans Amortized Cost Basis	1,151	1,118
Writeoff, Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	68	67
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0
Total	16,048	16,352
Writeoff, total	9
Total commercial loans | Commercial mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	719
One year prior	4,249	4,786
Two years prior	3,460	3,817
Three years prior	842	992
Four years prior	1,656	1,853
Five years prior		788
Prior	2,934
Prior		2,578
Revolving Loans Amortized Cost Basis	1,031	1,068
Revolving Loans Converted to Term Loans Amortized Cost Basis	68	67
Total	14,959	15,949
Total commercial loans | Commercial mortgage | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	3
One year prior	373	6
Two years prior	186	13
Three years prior	26	20
Four years prior	135	48
Five years prior		73
Prior	211
Prior		175
Revolving Loans Amortized Cost Basis	90	47
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	1,024	382
Total commercial loans | Commercial mortgage | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0
One year prior	0	0
Two years prior	1	0
Three years prior	21	1
Four years prior	1	1
Five years prior		1
Prior	12
Prior		15
Revolving Loans Amortized Cost Basis	30	3
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	65	21
Total commercial loans | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current	61
Writeoff, current period	0
One year prior	881	703
Writeoff, one year period	0
Two years prior	1,011	896
Writeoff, two year period	0
Three years prior	332	450
Writeoff, three year period	0
Four years prior	203	294
Writeoff, four year period	0
Five years prior		132
Prior	139
Writeoff, prior	0
Prior		52
Revolving Loans Amortized Cost Basis	11	1
Writeoff, Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	8	2
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0
Total	2,646	2,530
Writeoff, total	0
Total commercial loans | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	61
One year prior	876	698
Two years prior	988	895
Three years prior	315	445
Four years prior	203	262
Five years prior		107
Prior	89
Prior		48
Revolving Loans Amortized Cost Basis	11	1
Revolving Loans Converted to Term Loans Amortized Cost Basis	6	0
Total	2,549	2,456
Total commercial loans | Construction | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0
One year prior	5	5
Two years prior	23	1
Three years prior	17	5
Four years prior	0	32
Five years prior		25
Prior	50
Prior		4
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	2	2
Total	97	74
Total commercial loans | Construction | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0
One year prior	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Five years prior		0
Prior	0
Prior		0
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	0	0
Total commercial loans | Commercial lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Current	309
Writeoff, current period	0
One year prior	1,008	1,054
Writeoff, one year period	0
Two years prior	672	744
Writeoff, two year period	0
Three years prior	445	518
Writeoff, three year period	0
Four years prior	398	479
Writeoff, four year period	0
Five years prior		183
Prior	969
Writeoff, prior	1
Prior		958
Revolving Loans Amortized Cost Basis		0
Writeoff, Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis, writeoff	0
Total	3,801	3,936
Writeoff, total	1
Total commercial loans | Commercial lease financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Current	287
One year prior	973	1,039
Two years prior	668	743
Three years prior	436	509
Four years prior	390	467
Five years prior		174
Prior	956
Prior		947
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	3,710	3,879
Total commercial loans | Commercial lease financing | Criticized (Accruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	22
One year prior	35	15
Two years prior	4	1
Three years prior	9	9
Four years prior	8	12
Five years prior		9
Prior	12
Prior		10
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	90	56
Total commercial loans | Commercial lease financing | Criticized (Nonaccruing)
Financing Receivable, Credit Quality Indicator [Line Items]
Current	0
One year prior	0	0
Two years prior	0	0
Three years prior	0	0
Four years prior	0	0
Five years prior		0
Prior	1
Prior		1
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0	0
Total	$ 1	$ 1