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Loans - FDM Disclosure - Modification to Borrowers (Details) - USD ($) $ in Millions	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	$ 6,983	$ 3,116
Commitments to lend on loans modified in TDRs	197	193
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	5,984	2,556
30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	357	203
60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	235	124
Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	407	233
Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	999	560
Credit Card:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	4,404	763
Credit Card: | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	3,671	499
Credit Card: | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	232	72
Credit Card: | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	163	56
Credit Card: | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	338	136
Credit Card: | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	733	264
Credit Card: | Domestic Card
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	4,061	646
Credit Card: | Domestic Card | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	3,423	438
Credit Card: | Domestic Card | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	200	61
Credit Card: | Domestic Card | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	141	45
Credit Card: | Domestic Card | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	297	102
Credit Card: | Domestic Card | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	638	208
Credit Card: | Personal loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	208
Credit Card: | Personal loans | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	171
Credit Card: | Personal loans | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	20
Credit Card: | Personal loans | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	12
Credit Card: | Personal loans | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	5
Credit Card: | Personal loans | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	37
Credit Card: | International card businesses
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	135	117
Credit Card: | International card businesses | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	77	61
Credit Card: | International card businesses | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	12	11
Credit Card: | International card businesses | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	10	11
Credit Card: | International card businesses | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	36	34
Credit Card: | International card businesses | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	58	56
Consumer Banking:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	836	770
Consumer Banking: | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	648	572
Consumer Banking: | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	104	105
Consumer Banking: | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	63	68
Consumer Banking: | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	21	25
Consumer Banking: | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	188	198
Consumer Banking: | Auto
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	834	761
Consumer Banking: | Auto | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	646	564
Consumer Banking: | Auto | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	104	105
Consumer Banking: | Auto | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	63	68
Consumer Banking: | Auto | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	21	24
Consumer Banking: | Auto | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	188	197
Consumer Banking: | Retail banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	2	9
Consumer Banking: | Retail banking | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	2	8
Consumer Banking: | Retail banking | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	0	0
Consumer Banking: | Retail banking | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	0	0
Consumer Banking: | Retail banking | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	0	1
Consumer Banking: | Retail banking | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	0	1
Commercial Banking:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	1,743	1,583
Commercial Banking: | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	1,665	1,485
Commercial Banking: | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	21	26
Commercial Banking: | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	9	0
Commercial Banking: | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	48	72
Commercial Banking: | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	78	98
Commercial Banking: | Commercial and multifamily real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	769	641
Commercial Banking: | Commercial and multifamily real estate | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	748	622
Commercial Banking: | Commercial and multifamily real estate | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	21	19
Commercial Banking: | Commercial and multifamily real estate | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	0	0
Commercial Banking: | Commercial and multifamily real estate | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	0	0
Commercial Banking: | Commercial and multifamily real estate | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	21	19
Commercial Banking: | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	974	942
Commercial Banking: | Commercial and industrial | Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	917	863
Commercial Banking: | Commercial and industrial | 30-59 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	0	7
Commercial Banking: | Commercial and industrial | 60-89 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	9	0
Commercial Banking: | Commercial and industrial | Greater than 90 days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	48	72
Commercial Banking: | Commercial and industrial | Total Delinquent Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total Loans	$ 57	$ 79

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