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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Basic Earnings Per Share (EPS):        
Net income (loss) attributable to AGL $ 78 $ 125 $ 187 $ 206
Less: Distributed and undistributed income (loss) available to nonvested shareholders 0 1 1 1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 78 $ 124 $ 186 $ 205
Basic shares (in shares) 54.1 59.2 54.9 59.1
Basic EPS (in dollars per share) $ 1.43 $ 2.09 $ 3.38 $ 3.46
Diluted EPS:        
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic $ 78 $ 124 $ 186 $ 205
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 $ 78 $ 124 $ 186 $ 205
Basic shares (in shares) 54.1 59.2 54.9 59.1
Dilutive securities:        
Restricted stock awards (in shares) 0.9 0.9 1.2 1.2
Diluted shares (in shares) 55.0 60.1 56.1 60.3
Diluted EPS (in dollars per share) $ 1.41 $ 2.06 $ 3.31 $ 3.40
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect (in shares) 0.1 0.2 0.1 0.1