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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per share

Computation of Earnings Per Share 

			Year Ended December 31,
			2022						2021						2020
			(in millions, except per share amounts)
Basic EPS:
Net income (loss) attributable to AGL			$	124					$	389					362
Less: Distributed and undistributed income (loss) available to nonvested shareholders			1						—						1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic			$	123					$	389					361
Basic shares			62.9						73.5						85.5
Basic EPS			$	1.95					$	5.29					$	4.22
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic			$	123					$	389					$	361
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries			—						—						—
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted			$	123					$	389					$	361
Basic shares			62.9						73.5						85.5
Dilutive securities:
Options and restricted stock awards			1.0						0.8						0.7
Diluted shares			63.9						74.3						86.2
Diluted EPS			$	1.92					$	5.23					$	4.19
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect			0.6						0.1						0.8

Schedule of antidilutive securities excluded from computation of earnings per share

Computation of Earnings Per Share 

			Year Ended December 31,
			2022						2021						2020
			(in millions, except per share amounts)
Basic EPS:
Net income (loss) attributable to AGL			$	124					$	389					362
Less: Distributed and undistributed income (loss) available to nonvested shareholders			1						—						1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic			$	123					$	389					361
Basic shares			62.9						73.5						85.5
Basic EPS			$	1.95					$	5.29					$	4.22
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic			$	123					$	389					$	361
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries			—						—						—
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted			$	123					$	389					$	361
Basic shares			62.9						73.5						85.5
Dilutive securities:
Options and restricted stock awards			1.0						0.8						0.7
Diluted shares			63.9						74.3						86.2
Diluted EPS			$	1.92					$	5.23					$	4.19
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect			0.6						0.1						0.8

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- References

No definition available.

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

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X

- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

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