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Loans - FDM Disclosure - Modification to Borrowers (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | $ 3,110 | $ 2,053
Commitments to lend on loans modified in TDRs | 263 | 75
Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 2,475 | 1,520
30-59 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 258 | 156
60-89 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 131 | 94
Greater than 90 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 246 | 283
Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 635 | 533
Credit Card: |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 744 | 523
Credit Card: | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 491 | 318
Credit Card: | 30-59 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 72 | 73
Credit Card: | 60-89 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 56 | 48
Credit Card: | Greater than 90 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 125 | 84
Credit Card: | Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 253 | 205
Credit Card: | Domestic Card |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 616 | 447
Credit Card: | Domestic Card | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 423 | 283
Credit Card: | Domestic Card | 30-59 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 60 | 65
Credit Card: | Domestic Card | 60-89 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 45 | 40
Credit Card: | Domestic Card | Greater than 90 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 88 | 59
Credit Card: | Domestic Card | Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 193 | 164
Credit Card: | International card businesses |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 128 | 76
Credit Card: | International card businesses | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 68 | 35
Credit Card: | International card businesses | 30-59 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 12 | 8
Credit Card: | International card businesses | 60-89 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 11 | 8
Credit Card: | International card businesses | Greater than 90 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 37 | 25
Credit Card: | International card businesses | Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 60 | 41
Consumer Banking: |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 781 | 610
Consumer Banking: | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 570 | 467
Consumer Banking: | 30-59 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 112 | 79
Consumer Banking: | 60-89 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 71 | 46
Consumer Banking: | Greater than 90 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 28 | 18
Consumer Banking: | Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 211 | 143
Consumer Banking: | Auto |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 771 | 600
Consumer Banking: | Auto | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 560 | 457
Consumer Banking: | Auto | 30-59 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 112 | 79
Consumer Banking: | Auto | 60-89 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 71 | 46
Consumer Banking: | Auto | Greater than 90 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 28 | 18
Consumer Banking: | Auto | Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 211 | 143
Consumer Banking: | Retail banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 10 | 10
Consumer Banking: | Retail banking | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 10 | 10
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 | 0
Consumer Banking: | Retail banking | Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 0 | 0
Commercial Banking: |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 1,585 | 920
Commercial Banking: | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 1,414 | 735
Commercial Banking: | 30-59 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 74 | 4
Commercial Banking: | 60-89 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 4 | 0
Commercial Banking: | Greater than 90 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 93 | 181
Commercial Banking: | Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 171 | 185
Commercial Banking: | Commercial and multifamily real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 674 | 381
Commercial Banking: | Commercial and multifamily real estate | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 646 | 318
Commercial Banking: | Commercial and multifamily real estate | 30-59 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 0 | 0
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 | 28 | 63
Commercial Banking: | Commercial and multifamily real estate | Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 28 | 63
Commercial Banking: | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 911 | 539
Commercial Banking: | Commercial and industrial | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 768 | 417
Commercial Banking: | Commercial and industrial | 30-59 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 74 | 4
Commercial Banking: | Commercial and industrial | 60-89 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 4 | 0
Commercial Banking: | Commercial and industrial | Greater than 90 days |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | 65 | 118
Commercial Banking: | Commercial and industrial | Total Delinquent Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total Loans | $ 143 | $ 122

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