Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per share

Computation of Earnings Per Share

	Second Quarter				Six Months
	2016		2015		2016		2015
	(in millions)
Basic earnings per share ("EPS"):
Net income (loss) attributable to AGL	$	146	$	297	$	205	$	498
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	$	146	$	297	$	205	$	498
Basic shares	134.0		150.6		135.1		153.2
Basic EPS	$	1.09	$	1.97	$	1.52	$	3.25
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	146	$	297	$	205	$	498
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	$	146	$	297	$	205	$	498
Basic shares	134.0		150.6		135.1		153.2
Dilutive securities:
Options and restricted stock awards	0.8		1.0		0.8		0.9
Diluted shares	134.8		151.6		135.9		154.1
Diluted EPS	$	1.09	$	1.96	$	1.51	$	3.23
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	0.6		0.1		0.7		0.4

Schedule of antidilutive securities excluded from computation of earnings per share

Computation of Earnings Per Share

	Second Quarter				Six Months
	2016		2015		2016		2015
	(in millions)
Basic earnings per share ("EPS"):
Net income (loss) attributable to AGL	$	146	$	297	$	205	$	498
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	$	146	$	297	$	205	$	498
Basic shares	134.0		150.6		135.1		153.2
Basic EPS	$	1.09	$	1.97	$	1.52	$	3.25
Diluted EPS:
Distributed and undistributed income (loss) available to common shareholders of AGL and subsidiaries, basic	$	146	$	297	$	205	$	498
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	$	146	$	297	$	205	$	498
Basic shares	134.0		150.6		135.1		153.2
Dilutive securities:
Options and restricted stock awards	0.8		1.0		0.8		0.9
Diluted shares	134.8		151.6		135.9		154.1
Diluted EPS	$	1.09	$	1.96	$	1.51	$	3.23
Potentially dilutive securities excluded from computation of EPS because of antidilutive effect	0.6		0.1		0.7		0.4