v3.25.2
Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Basic Earnings Per Share (EPS):        
Net income (loss) attributable to AGL $ 103 $ 78 $ 279 $ 187
Less: Distributed and undistributed income (loss) available to nonvested shareholders 0 0 2 1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 103 $ 78 $ 277 $ 186
Basic shares (in shares) 48.9 54.1 49.5 54.9
Basic EPS (in dollars per share) $ 2.10 $ 1.43 $ 5.60 $ 3.38
Diluted EPS:        
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 103 $ 78 $ 277 $ 186
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries 0 0 0 0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted $ 103 $ 78 $ 277 $ 186
Basic shares (in shares) 48.9 54.1 49.5 54.9
Dilutive securities:        
Restricted stock awards (in shares) 0.5 0.9 0.6 1.2
Diluted shares (in shares) 49.4 55.0 50.1 56.1
Diluted EPS (in dollars per share) $ 2.08 $ 1.41 $ 5.54 $ 3.31
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect (in shares) 0.2 0.1 0.1 0.1