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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Basic Earnings Per Share (EPS):        
Net income (loss) attributable to AGL $ (47) $ 98 $ 19 $ 109
Less: Distributed and undistributed income (loss) available to nonvested shareholders 0 0 0 0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ (47) $ 98 $ 19 $ 109
Basic shares (in shares) 63.8 75.2 65.0 75.9
Basic EPS (in dollars per share) $ (0.74) $ 1.31 $ 0.29 $ 1.44
Diluted EPS:        
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ (47) $ 98 $ 19 $ 109
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 $ (47) $ 98 $ 19 $ 109
Basic shares (in shares) 63.8 75.2 65.0 75.9
Dilutive securities:        
Options and restricted stock awards (in shares) 0.0 0.8 1.2 0.8
Diluted shares (in shares) 63.8 76.0 66.2 76.7
Diluted EPS (in dollars per share) $ (0.74) $ 1.29 $ 0.29 $ 1.42
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect (in shares) 2.1 0.0 1.2 0.2