Earnings per Common Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table presents the calculation of basic and diluted earnings per common share.

	Three months ended March 31,
($ in millions, except per share data; shares in thousands) (a)	2019			2018
Net income from continuing operations attributable to common stockholders	$	375		$	252
Loss from discontinued operations, net of tax	(1		)	(2		)
Net income attributable to common stockholders	$	374		$	250
Basic weighted-average common shares outstanding (b)	404,129			436,213
Diluted weighted-average common shares outstanding (b)	405,959			438,931
Basic earnings per common share
Net income from continuing operations	$	0.93		$	0.58
Loss from discontinued operations, net of tax	—			(0.01		)
Net income	$	0.93		$	0.57
Diluted earnings per common share
Net income from continuing operations	$	0.92		$	0.57
Loss from discontinued operations, net of tax	—			(0.01		)
Net income	$	0.92		$	0.57

(a) Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.

(b) Includes shares related to share-based compensation that vested but were not yet issued.