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LONG-TERM DEBT AND SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Common stock, outstanding shares (in shares) 147,640   147,640   147,871      
Common stock, par value (in dollars per share) $ 0.001   $ 0.001   $ 0.001      
Common stock and additional paid in capital $ 1,721   $ 1,721   $ 1,737      
Accumulated other comprehensive loss 6,865 $ 6,385 6,865 $ 6,385 6,124 $ 6,596 $ 6,025 $ 5,691
Unrealized loss amortization associated with the securities transferred from AFS to HTM 47 51 137 147        
4.70% Fixed-To-Floating Senior Notes | Senior notes                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Debt instrument face amount $ 500   $ 500          
Debt instrument stated interest rate 4.70%   4.70%          
Fixed-Rate Available For Sale Securities                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Unrealized loss amortization associated with the securities transferred from AFS to HTM, before tax     $ 1,700   1,800      
Unrealized loss amortization associated with the securities transferred from AFS to HTM     1,200   1,400      
Accumulated other comprehensive income (loss)                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated other comprehensive loss $ (2,056) $ (2,336) $ (2,056) $ (2,336) $ (2,380) $ (2,164) $ (2,549) $ (2,692)