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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Basic Earnings Per Share (EPS):        
Net income (loss) attributable to AGL $ 105 $ 171 $ 384 $ 358
Less: Distributed and undistributed income (loss) available to nonvested shareholders 1 2 2 3
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 104 $ 169 $ 382 $ 355
Basic shares (in shares) 47.4 52.4 48.8 54.1
Basic EPS (in dollars per share) $ 2.20 $ 3.23 $ 7.82 $ 6.57
Diluted EPS:        
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 104 $ 169 $ 382 $ 355
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 $ 104 $ 169 $ 382 $ 355
Basic shares (in shares) 47.4 52.4 48.8 54.1
Dilutive securities:        
Restricted stock awards (in shares) 0.6 1.0 0.6 1.1
Diluted shares (in shares) 48.0 53.4 49.4 55.2
Diluted EPS (in dollars per share) $ 2.18 $ 3.17 $ 7.73 $ 6.44
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect (in shares) 0.0 0.0 0.1 0.1