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INCOME PER COMMON SHARE
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
INCOME PER COMMON SHARE
Q. INCOME PER COMMON SHARE

Reconciliations of the numerators and denominators used in the computations of basic and diluted income per common share were as follows, in millions:
Year Ended December 31,
 202420232022
Numerator (basic and diluted):
Net income$822 $908 $844 
Less: Allocation to redeemable noncontrolling interest— — (2)
Less: Allocation to unvested restricted stock awards— — 4 
Net income attributable to common shareholders$822 $908 $842 
Denominator:
Basic common shares (based upon weighted average)218 225 231 
Add: Dilutive effect of stock options and other stock-based incentives1 1 1 
Diluted common shares219 226 232 
We follow accounting guidance regarding determining whether instruments granted in share-based payment transactions are participating securities. This accounting guidance clarifies that share-based payment awards that entitle their holders to receive non-forfeitable dividends prior to vesting should be considered participating securities. The dividends associated with the unvested restricted stock units are forfeitable, and consequently, the restricted stock units are not considered a participating security and are not accounted for under the two-class method. We have also granted restricted stock awards that contain non-forfeitable rights to dividends on unvested shares; such unvested restricted stock awards are considered participating securities. As participating securities, the unvested shares are required to be included in the calculation of our basic income per common share, using the two-class method. The two-class method of computing income per common share is an allocation method that calculates income per share for each class of common stock and participating security according to dividends declared and participation rights in undistributed earnings. For the years ended December 31, 2024, 2023 and 2022, we allocated dividends and undistributed earnings to the participating securities.
The following stock options, restricted stock units and performance restricted stock units were excluded from the computation of weighted-average diluted common shares outstanding due to their anti-dilutive effect, in thousands:
Year Ended December 31,
 202420232022
Number of stock options 176 871 635 
Number of restricted stock units — 5 20 
Number of performance restricted stock units 47 — 15