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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Basic EPS:      
Net income (loss) attributable to AGL $ 376 $ 739 $ 124
Less: Distributed and undistributed income (loss) available to nonvested shareholders 3 6 1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 373 $ 733 $ 123
Basic shares (in shares) 53.3 58.4 62.9
Basic EPS (in dollars per share) $ 7.01 $ 12.54 $ 1.95
Diluted EPS:      
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 373 $ 733 $ 123
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries 0 0 0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted $ 373 $ 733 $ 123
Basic shares (in shares) 53.3 58.4 62.9
Dilutive securities: Restricted stock awards (in shares) 1.0 1.2 1.0
Diluted shares (in shares) 54.3 59.6 63.9
Diluted EPS (in dollars per share) $ 6.87 $ 12.30 $ 1.92
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect 0.1 0.1 0.6