Quarterly report [Sections 13 or 15(d)]

REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation by Segment (Details)

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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue $ 377 $ 360 $ 728 $ 696
Noninterest income within the scope of other GAAP topics 94 131 237 262
Noninterest income 471 491 965 958
Payments and cash management revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 150 142 290 276
Wealth and asset management revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 102 90 203 178
Customer deposit and loan fees        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 62 56 116 110
Capital markets and advisory fees        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 41 43 71 72
Noninterest income 84 73 151 129
Leasing revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 3 10 7 20
Noninterest income 10 19 24 41
Insurance income        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 19 18 39 37
Noninterest income 19 18 39 37
Other noninterest income        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 0 1 2 3
Operating Segments | Consumer & Regional Banking        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 295 280 573 545
Noninterest income within the scope of other GAAP topics 44 42 93 85
Noninterest income 339 322 666 630
Operating Segments | Consumer & Regional Banking | Payments and cash management revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 117 114 225 221
Operating Segments | Consumer & Regional Banking | Wealth and asset management revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 98 88 193 173
Operating Segments | Consumer & Regional Banking | Customer deposit and loan fees        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 58 53 110 103
Operating Segments | Consumer & Regional Banking | Capital markets and advisory fees        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 2 7 6 11
Operating Segments | Consumer & Regional Banking | Leasing revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 0 0 1 1
Operating Segments | Consumer & Regional Banking | Insurance income        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 19 16 36 32
Operating Segments | Consumer & Regional Banking | Other noninterest income        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 1 2 2 4
Operating Segments | Commercial Banking        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 84 81 157 152
Noninterest income within the scope of other GAAP topics 93 83 182 157
Noninterest income 177 164 339 309
Operating Segments | Commercial Banking | Payments and cash management revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 33 28 65 55
Operating Segments | Commercial Banking | Wealth and asset management revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 4 2 10 5
Operating Segments | Commercial Banking | Customer deposit and loan fees        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 4 3 6 7
Operating Segments | Commercial Banking | Capital markets and advisory fees        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 39 36 65 61
Operating Segments | Commercial Banking | Leasing revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 3 10 6 19
Operating Segments | Commercial Banking | Insurance income        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 0 2 3 5
Operating Segments | Commercial Banking | Other noninterest income        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 1 0 2 0
Treasury / Other        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue (2) (1) (2) (1)
Noninterest income within the scope of other GAAP topics (43) 6 (38) 20
Noninterest income (45) 5 (40) 19
Treasury / Other | Payments and cash management revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 0 0 0 0
Treasury / Other | Wealth and asset management revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 0 0 0 0
Treasury / Other | Customer deposit and loan fees        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 0 0 0 0
Treasury / Other | Capital markets and advisory fees        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 0 0 0 0
Treasury / Other | Leasing revenue        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 0 0 0 0
Treasury / Other | Insurance income        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue 0 0 0 0
Treasury / Other | Other noninterest income        
Disaggregation of Revenue [Line Items]        
Wealth and asset management revenue $ (2) $ (1) $ (2) $ (1)