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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Basic EPS:      
Net income (loss) attributable to AGL $ 739 $ 124 $ 389
Less: Distributed and undistributed income (loss) available to nonvested shareholders 6 1 0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 733 $ 123 $ 389
Basic shares (in shares) 58.4 62.9 73.5
Basic EPS (in dollars per share) $ 12.54 $ 1.95 $ 5.29
Diluted EPS:      
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 733 $ 123 $ 389
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 $ 733 $ 123 $ 389
Basic shares (in shares) 58.4 62.9 73.5
Dilutive securities: Options and restricted stock awards (in shares) 1.2 1.0 0.8
Diluted shares (in shares) 59.6 63.9 74.3
Diluted EPS (in dollars per share) $ 12.30 $ 1.92 $ 5.23
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect 0.1 0.6 0.1