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
Mar. 31, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue $ 351 $ 336
Noninterest income within the scope of other GAAP topics 143 131
Noninterest income 494 467
Payments and cash management revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 140 134
Wealth and asset management revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 101 88
Customer deposit and loan fees    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 54 54
Capital markets and advisory fees    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 30 29
Leasing revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 4 10
Insurance income    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 20 19
Other noninterest income    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 2 2
Operating Segments | Consumer & Regional Banking    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 278 265
Noninterest income within the scope of other GAAP topics 49 43
Noninterest income 327 308
Operating Segments | Consumer & Regional Banking | Payments and cash management revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 108 107
Operating Segments | Consumer & Regional Banking | Wealth and asset management revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 95 85
Operating Segments | Consumer & Regional Banking | Customer deposit and loan fees    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 52 50
Operating Segments | Consumer & Regional Banking | Capital markets and advisory fees    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 4 4
Operating Segments | Consumer & Regional Banking | Leasing revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 1 1
Operating Segments | Consumer & Regional Banking | Insurance income    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 17 16
Operating Segments | Consumer & Regional Banking | Other noninterest income    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 1 2
Operating Segments | Commercial Banking    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 73 71
Noninterest income within the scope of other GAAP topics 89 74
Noninterest income 162 145
Operating Segments | Commercial Banking | Payments and cash management revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 32 27
Operating Segments | Commercial Banking | Wealth and asset management revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 6 3
Operating Segments | Commercial Banking | Customer deposit and loan fees    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 2 4
Operating Segments | Commercial Banking | Capital markets and advisory fees    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 26 25
Operating Segments | Commercial Banking | Leasing revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 3 9
Operating Segments | Commercial Banking | Insurance income    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 3 3
Operating Segments | Commercial Banking | Other noninterest income    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 1 0
Treasury / Other    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 0 0
Noninterest income within the scope of other GAAP topics 5 14
Noninterest income 5 14
Treasury / Other | Payments and cash management revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 0 0
Treasury / Other | Wealth and asset management revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 0 0
Treasury / Other | Customer deposit and loan fees    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 0 0
Treasury / Other | Capital markets and advisory fees    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 0 0
Treasury / Other | Leasing revenue    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 0 0
Treasury / Other | Insurance income    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue 0 0
Treasury / Other | Other noninterest income    
Disaggregation of Revenue [Line Items]    
Wealth and asset management revenue $ 0 $ 0