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EARNINGS PER COMMON SHARE COMPUTATION (Tables)
 9 Months Ended
Sep. 30, 2025
Earnings Per Share [Abstract]  
Schedule of Computation of Basic and Diluted Earnings Per Common Share
Detail supporting the computation of basic and diluted earnings per common share was as follows for the three and nine months ended September 30, 2025 and 2024:
Three months ended September 30,Nine months ended September 30,
2025202420252024
(dollars in millions, except per common share results; number of shares in thousands)
Net income available for common stockholders$195 $480 $1,984 $1,900 
Weighted average outstanding shares of common stock
    used to compute basic earnings per common share		120,273 120,405 120,492 120,609 
Dilutive effect of:
Employee stock options— 3 — 4 
Restricted stock472 356 286 286 
Shares used to compute diluted earnings per common share120,745 120,764 120,778 120,899 
Basic earnings per common share$1.62 $3.99 $16.47 $15.76 
Diluted earnings per common share$1.62 $3.98 $16.43 $15.72 
Number of antidilutive stock options and restricted stock
    excluded from computation		450 361 1,016 759