Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per share

Computation of Earnings Per Share

	First Quarter
	2015		2014
	(in millions, except per share amounts)
Basic earnings per share ("EPS"):
Net income (loss) attributable to AGL	$	201	$	42
Less: Distributed and undistributed income (loss) available to nonvested shareholders	0		0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	201	$	42
Basic shares	155.8		182.1
Basic EPS	$	1.29	$	0.23
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	201	$	42
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries	0		—
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted	$	201	$	42
Basic shares	155.8		182.1
Effect of dilutive securities:
Options and restricted stock awards	1.0		1.0
Diluted shares	156.8		183.1
Diluted EPS	$	1.28	$	0.23
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	0.7		1.5

Schedule of antidilutive securities excluded from computation of earnings per share

Computation of Earnings Per Share

	First Quarter
	2015		2014
	(in millions, except per share amounts)
Basic earnings per share ("EPS"):
Net income (loss) attributable to AGL	$	201	$	42
Less: Distributed and undistributed income (loss) available to nonvested shareholders	0		0
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	201	$	42
Basic shares	155.8		182.1
Basic EPS	$	1.29	$	0.23
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	201	$	42
Plus: Re-allocation of undistributed income (loss) available to nonvested shareholders of AGL and subsidiaries	0		—
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, diluted	$	201	$	42
Basic shares	155.8		182.1
Effect of dilutive securities:
Options and restricted stock awards	1.0		1.0
Diluted shares	156.8		183.1
Diluted EPS	$	1.28	$	0.23
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	0.7		1.5