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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Schedule of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pretax $ (1,046) $ 134
Income Taxes 250 (51)
Net of Income Taxes (796) 83
Unrealized loss on securities available for sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pretax (1,221) (162)
Income Taxes 295 25
Net of Income Taxes (926) (137)
Unrealized loss on securities available for sale transferred to held to maturity    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pretax (5) (5)
Income Taxes 1 1
Net of Income Taxes (4) (4)
Defined benefit pension items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pretax 276 282
Income Taxes (71) (72)
Net of Income Taxes 205 210
Unrealized (loss) gain on cash flow hedge derivatives    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Pretax (96) 19
Income Taxes 25 (5)
Net of Income Taxes $ (71) $ 14