Asset Quality - Schedule of Consumer Credit Exposure (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 104,260	$ 112,606
Accrued interest	456	522
Total consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2024	628
Current period gross write-offs, 2024	1
2023	1,140
Current period gross write-offs, 2023	7
2022	8,104
Current period gross write-offs, 2022	18
2021	10,471
Current period gross write-offs, 2021	12
2020	3,934
Current period gross write-offs, 2020	7
Prior	3,328
Current period gross write-offs, prior	8
Revolving Loans Amortized Cost Basis	4,408
Current period gross write-offs, Revolving Loans Amortized Cost Basis	63
Revolving Loans Converted to Term Loans Amortized Cost Basis	356
Current period gross write-offs, Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	32,369	35,015
Current period gross write-offs, total	116
Accrued interest	134
Total consumer loans | Real estate — residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
2024	355
Current period gross write-offs, 2024	1
2023	800
Current period gross write-offs, 2023	0
2022	6,399
Current period gross write-offs, 2022	1
2021	7,921
Current period gross write-offs, 2021	0
2020	2,471
Current period gross write-offs, 2020	0
Prior	1,939
Current period gross write-offs, prior	1
Revolving Loans Amortized Cost Basis	1
Current period gross write-offs, Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Current period gross write-offs, Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	19,886	20,958
Current period gross write-offs, total	3
Total consumer loans | Real estate — residential mortgage | 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
2024	281
2023	669
2022	5,720
2021	7,203
2020	2,247
Prior	1,510
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	17,630
Total consumer loans | Real estate — residential mortgage | 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
2024	67
2023	116
2022	597
2021	655
2020	199
Prior	280
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	1,914
Total consumer loans | Real estate — residential mortgage | Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
2024	4
2023	13
2022	81
2021	63
2020	24
Prior	134
Revolving Loans Amortized Cost Basis	0
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	319
Total consumer loans | Real estate — residential mortgage | No Score
Financing Receivable, Credit Quality Indicator [Line Items]
2024	3
2023	2
2022	1
2021	0
2020	1
Prior	15
Revolving Loans Amortized Cost Basis	1
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	23
Total consumer loans | Home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
2024	52
2023	53
2022	204
2021	996
2020	772
Prior	1,000
Revolving Loans Amortized Cost Basis	2,925
Revolving Loans Converted to Term Loans Amortized Cost Basis	356
Total loans	6,358	7,139
Total consumer loans | Home equity loans | 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
2024	33
2023	31
2022	139
2021	775
2020	612
Prior	731
Revolving Loans Amortized Cost Basis	1,886
Revolving Loans Converted to Term Loans Amortized Cost Basis	251
Total loans	4,458
Total consumer loans | Home equity loans | 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
2024	17
2023	17
2022	50
2021	181
2020	129
Prior	186
Revolving Loans Amortized Cost Basis	772
Revolving Loans Converted to Term Loans Amortized Cost Basis	80
Total loans	1,432
Total consumer loans | Home equity loans | Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
2024	2
2023	5
2022	15
2021	40
2020	31
Prior	82
Revolving Loans Amortized Cost Basis	263
Revolving Loans Converted to Term Loans Amortized Cost Basis	25
Total loans	463
Total consumer loans | Home equity loans | No Score
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	1
Revolving Loans Amortized Cost Basis	4
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	5
Total consumer loans | Home equity loans
Financing Receivable, Credit Quality Indicator [Line Items]
Current period gross write-offs, 2024	0
Current period gross write-offs, 2023	0
Current period gross write-offs, 2022	0
Current period gross write-offs, 2021	0
Current period gross write-offs, 2020	0
Current period gross write-offs, prior	1
Current period gross write-offs, Revolving Loans Amortized Cost Basis	1
Current period gross write-offs, Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Current period gross write-offs, total	2
Total consumer loans | Other consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
2024	221
Current period gross write-offs, 2024	0
2023	287
Current period gross write-offs, 2023	7
2022	1,501
Current period gross write-offs, 2022	17
2021	1,554
Current period gross write-offs, 2021	12
2020	691
Current period gross write-offs, 2020	7
Prior	389
Current period gross write-offs, prior	6
Revolving Loans Amortized Cost Basis	524
Current period gross write-offs, Revolving Loans Amortized Cost Basis	15
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Current period gross write-offs, Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	5,167	5,916
Current period gross write-offs, total	64
Total consumer loans | Other consumer loans | 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
2024	107
2023	143
2022	1,149
2021	1,210
2020	527
Prior	245
Revolving Loans Amortized Cost Basis	88
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	3,469
Total consumer loans | Other consumer loans | 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
2024	70
2023	109
2022	275
2021	268
2020	128
Prior	108
Revolving Loans Amortized Cost Basis	184
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	1,142
Total consumer loans | Other consumer loans | Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
2024	9
2023	23
2022	59
2021	59
2020	29
Prior	24
Revolving Loans Amortized Cost Basis	56
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	259
Total consumer loans | Other consumer loans | No Score
Financing Receivable, Credit Quality Indicator [Line Items]
2024	35
2023	12
2022	18
2021	17
2020	7
Prior	12
Revolving Loans Amortized Cost Basis	196
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	297
Total consumer loans | Commercial credit card
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
Current period gross write-offs, 2024	0
2023	0
Current period gross write-offs, 2023	0
2022	0
Current period gross write-offs, 2022	0
2021	0
Current period gross write-offs, 2021	0
2020	0
Current period gross write-offs, 2020	0
Prior	0
Current period gross write-offs, prior	0
Revolving Loans Amortized Cost Basis	958
Current period gross write-offs, Revolving Loans Amortized Cost Basis	47
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Current period gross write-offs, Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	958	$ 1,002
Current period gross write-offs, total	47
Total consumer loans | Commercial credit card | 750 and above
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans Amortized Cost Basis	476
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	476
Total consumer loans | Commercial credit card | 660 to 749
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans Amortized Cost Basis	372
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	372
Total consumer loans | Commercial credit card | Less than 660
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans Amortized Cost Basis	109
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	109
Total consumer loans | Commercial credit card | No Score
Financing Receivable, Credit Quality Indicator [Line Items]
2024	0
2023	0
2022	0
2021	0
2020	0
Prior	0
Revolving Loans Amortized Cost Basis	1
Revolving Loans Converted to Term Loans Amortized Cost Basis	0
Total loans	$ 1