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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Basic Earnings Per Share (EPS):        
Net income (loss) attributable to AGL $ 157 $ 11 $ 363 $ 30
Less: Distributed and undistributed income (loss) available to nonvested shareholders 2 0 3 0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 155 $ 11 $ 360 $ 30
Basic shares (in shares) 58.5 61.7 58.9 63.9
Basic EPS (in dollars per share) $ 2.65 $ 0.18 $ 6.11 $ 0.47
Diluted EPS:        
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 155 $ 11 $ 360 $ 30
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 $ 155 $ 11 $ 360 $ 30
Basic shares (in shares) 58.5 61.7 58.9 63.9
Dilutive securities:        
Options and restricted stock awards (in shares) 1.1 1.2 1.1 1.2
Diluted shares (in shares) 59.6 62.9 60.0 65.1
Diluted EPS (in dollars per share) $ 2.60 $ 0.18 $ 5.99 $ 0.46
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect (in shares) 0.1 0.1 0.1 0.8