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CREDIT QUALITY AND THE ALLOWANCE FOR CREDIT LOSSES - Modified (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 491 $ 769   $ 1,322 $ 1,463
Total as a % of Loan Class 0.36% 0.54%      
Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       772 1,027
30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       56 58
60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       5 11
90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       20 55
Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       469 312
Unfunded loan commitment          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 157   $ 206    
Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 456 $ 691   1,180 1,252
Total as a % of Loan Class 0.65% 0.95%      
Commercial | Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       691 890
Commercial | 30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       50 39
Commercial | 60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 10
Commercial | 90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       3 33
Commercial | Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       436 280
Commercial | Commercial and industrial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 176 $ 183   382 373
Total as a % of Loan Class 0.40% 0.42%      
Weighted-Average Interest Rate Reduction 0.81% 4.49%      
Weighted-Average Term Extension (in Months) 10 months 9 months      
Weighted-Average Payment Deferral $ 0 $ 1      
Commercial | Commercial and industrial | Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       311 223
Commercial | Commercial and industrial | 30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       17 1
Commercial | Commercial and industrial | 60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 5
Commercial | Commercial and industrial | 90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       3 0
Commercial | Commercial and industrial | Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       51 144
Commercial | Commercial real estate          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 280 $ 508   798 879
Total as a % of Loan Class 1.05% 1.76%      
Weighted-Average Interest Rate Reduction 0.75% 0.53%      
Weighted-Average Term Extension (in Months) 10 months 16 months      
Weighted-Average Payment Deferral $ 1 $ 1      
Commercial | Commercial real estate | Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       380 667
Commercial | Commercial real estate | 30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       33 38
Commercial | Commercial real estate | 60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 5
Commercial | Commercial real estate | 90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 33
Commercial | Commercial real estate | Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       385 136
Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 35 $ 78   142 211
Total as a % of Loan Class 0.05% 0.11%      
Retail | Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       81 137
Retail | 30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       6 19
Retail | 60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       5 1
Retail | 90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       17 22
Retail | Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       33 32
Retail | Residential mortgages          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 23 $ 46   94 125
Total as a % of Loan Class 0.07% 0.15%      
Weighted-Average Interest Rate Reduction 0.98% 2.01%      
Weighted-Average Term Extension (in Months) 111 months 88 months      
Weighted-Average Payment Deferral $ 0 $ 0      
Retail | Residential mortgages | Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       51 71
Retail | Residential mortgages | 30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       4 17
Retail | Residential mortgages | 60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       3 0
Retail | Residential mortgages | 90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       17 22
Retail | Residential mortgages | Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       19 15
Retail | Home equity          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 4 $ 6   22 15
Total as a % of Loan Class 0.02% 0.04%      
Weighted-Average Interest Rate Reduction 4.55% 3.16%      
Weighted-Average Term Extension (in Months) 74 months 88 months      
Weighted-Average Payment Deferral $ 0 $ 0      
Retail | Home equity | Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       9 5
Retail | Home equity | 30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Home equity | 60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       1 0
Retail | Home equity | 90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Home equity | Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       12 10
Retail | Automobile          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 0 $ 0   0 0
Total as a % of Loan Class 0.00% 0.00%      
Weighted-Average Interest Rate Reduction 0.00% 0.00%      
Weighted-Average Payment Deferral $ 0 $ 0      
Retail | Automobile | Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Automobile | 30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Automobile | 60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Automobile | 90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Automobile | Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Education          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 2 $ 21   9 58
Total as a % of Loan Class 0.02% 0.18%      
Weighted-Average Interest Rate Reduction 4.96% 4.31%      
Weighted-Average Payment Deferral $ 0 $ 0      
Retail | Education | Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       8 51
Retail | Education | 30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 1
Retail | Education | 60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Education | 90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Education | Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       1 6
Retail | Other retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 6 $ 5   17 13
Total as a % of Loan Class 0.14% 0.10%      
Weighted-Average Interest Rate Reduction 20.30% 19.80%      
Weighted-Average Payment Deferral $ 0 $ 0      
Retail | Other retail | Current          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       13 10
Retail | Other retail | 30-59          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       2 1
Retail | Other retail | 60-89          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       1 1
Retail | Other retail | 90+          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       0 0
Retail | Other retail | Nonaccrual          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis       $ 1 $ 1
Interest Rate Reduction          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 52 10      
Interest Rate Reduction | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 42 0      
Interest Rate Reduction | Commercial | Commercial and industrial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 32 0      
Interest Rate Reduction | Commercial | Commercial real estate          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 10 0      
Interest Rate Reduction | Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 10 10      
Interest Rate Reduction | Retail | Residential mortgages          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 1 1      
Interest Rate Reduction | Retail | Home equity          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 1 1      
Interest Rate Reduction | Retail | Automobile          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Interest Rate Reduction | Retail | Education          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 2 3      
Interest Rate Reduction | Retail | Other retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 6 5      
Term Extension          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 328 566      
Term Extension | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 313 528      
Term Extension | Commercial | Commercial and industrial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 141 85      
Term Extension | Commercial | Commercial real estate          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 172 443      
Term Extension | Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 15 38      
Term Extension | Retail | Residential mortgages          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 15 37      
Term Extension | Retail | Home equity          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 1      
Term Extension | Retail | Automobile          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Term Extension | Retail | Education          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Term Extension | Retail | Other retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Payment Delay          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 79 112      
Payment Delay | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 75 89      
Payment Delay | Commercial | Commercial and industrial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 2 65      
Payment Delay | Commercial | Commercial real estate          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 73 24      
Payment Delay | Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 4 23      
Payment Delay | Retail | Residential mortgages          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 2 5      
Payment Delay | Retail | Home equity          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 2 0      
Payment Delay | Retail | Automobile          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Payment Delay | Retail | Education          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 18      
Payment Delay | Retail | Other retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Principal Forgiveness          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Principal Forgiveness | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Principal Forgiveness | Commercial | Commercial and industrial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Amount of Principal Forgiven 0 0      
Principal Forgiveness | Commercial | Commercial real estate          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Amount of Principal Forgiven 0 0      
Principal Forgiveness | Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Principal Forgiveness | Retail | Residential mortgages          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Amount of Principal Forgiven 0 0      
Principal Forgiveness | Retail | Home equity          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Amount of Principal Forgiven 0 0      
Principal Forgiveness | Retail | Automobile          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Amount of Principal Forgiven 0 0      
Principal Forgiveness | Retail | Education          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Amount of Principal Forgiven 0 0      
Principal Forgiveness | Retail | Other retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Amount of Principal Forgiven 2 2      
Interest Rate Reduction and Term Extension          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 5 48      
Interest Rate Reduction and Term Extension | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 41      
Interest Rate Reduction and Term Extension | Commercial | Commercial and industrial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 1      
Interest Rate Reduction and Term Extension | Commercial | Commercial real estate          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 40      
Interest Rate Reduction and Term Extension | Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 5 7      
Interest Rate Reduction and Term Extension | Retail | Residential mortgages          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 4 3      
Interest Rate Reduction and Term Extension | Retail | Home equity          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 1 4      
Interest Rate Reduction and Term Extension | Retail | Automobile          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Interest Rate Reduction and Term Extension | Retail | Education          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Interest Rate Reduction and Term Extension | Retail | Other retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Term Extension and Payment Delay          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 27 33      
Term Extension and Payment Delay | Commercial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 26 33      
Term Extension and Payment Delay | Commercial | Commercial and industrial          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 1 32      
Term Extension and Payment Delay | Commercial | Commercial real estate          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 25 1      
Term Extension and Payment Delay | Retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 1 0      
Term Extension and Payment Delay | Retail | Residential mortgages          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 1 0      
Term Extension and Payment Delay | Retail | Home equity          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Term Extension and Payment Delay | Retail | Automobile          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Term Extension and Payment Delay | Retail | Education          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis 0 0      
Term Extension and Payment Delay | Retail | Other retail          
Financing Receivable, Troubled Debt Restructuring [Line Items]          
Amortized cost basis $ 0 $ 0