Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Computation of Earnings Per Share

Computation of Earnings Per Share

	Year Ended December 31,
	2013		2012		2011
	(in millions, except per share amounts)
Basic EPS:
Net income (loss) attributable to AGL	$	808	$	110	773
Less: Distributed and undistributed income (loss) available to nonvested shareholders	1		0		1
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	807	$	110	772
Basic shares	186.6		189.2		183.4
Basic EPS	$	4.32	$	0.58	$	4.21
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	807	$	110	$	772
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	$	807	$	110	$	772
Basic shares	186.6		189.2		183.4
Effect of dilutive securities:
Options and restricted stock awards	1.0		0.8		0.9
Equity units	—		0.7		1.2
Diluted shares	187.6		190.7		185.5
Diluted EPS	$	4.30	$	0.57	$	4.16
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	2.7		9.9		7.2