Capital Stock and Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Schedule of reconciliation of basic and diluted net income per share

A reconciliation of the components of basic and diluted earnings per common share is presented in the table below:

	Three Months Ended June 30,				Six Months Ended June 30,
	2019		2018		2019		2018
	($ in millions, except per share amounts, shares in thousands)
Net income attributable to common stock	$	349	$	219	$	359	$	382
Weighted average common shares outstanding
Basic weighted average common units outstanding	164,839		98,614		164,846		98,584
Effect of dilutive securities:
Potential common shares issuable	180		183		407		236
Diluted weighted average common shares outstanding	165,019		98,797		165,253		98,820
Basic net income attributable to common stock	$	2.12	$	2.22	$	2.18	$	3.87
Diluted net income attributable to common stock	$	2.11	$	2.22	$	2.17	$	3.87

Schedule of antidilutive securities excluded from computation of earnings per share

The Company had the following shares that were excluded from the computation of diluted earnings per share because their inclusion would have been anti-dilutive for the periods presented but could potentially dilute basic earnings per share in future periods:

	Three Months Ended June 30,		Six Months Ended June 30,
	2019	2018	2019	2018
	(in thousands)
Restricted stock units	60	32	20	—