Equity And Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2018

Equity And Earnings Per Share [Abstract]


	IBG, Inc.	Holdings	Total
Ownership %	18.1%	81.9%	100.0%
Membership interests	75,100,955	338,691,717	413,792,672

Earnings Per Share Basic And Diluted

Basic earnings per share is calculated utilizing net income available for common stockholders divided by the weighted average number of shares of Class A and Class B common stock outstanding for that period.



	Year-Ended December 31,
	2018		2017		2016
	(in millions, except share or per share amounts)
Basic earnings per share
Net income available for common stockholders	$	169	$	76	$	84
Weighted average shares of common stock outstanding
Class A		73,438,109		69,926,833		66,013,147
Class B		100		100		100
		73,438,209		69,926,933		66,013,247
Basic earnings per share	$	2.30	$	1.09	$	1.28

Diluted earnings per share are calculated utilizing the Company’s basic net income available for common stockholders divided by diluted weighted average shares outstanding with no adjustments to net income available to common stockholders for potentially dilutive common shares.



	Year-Ended December 31,
	2018		2017		2016
	(in millions, except share or per share amounts)
Diluted earnings per share
Net income available for common stockholders	$	169	$	76	$	84
Weighted average shares of common stock outstanding
Class A
Issued and outstanding		73,438,109		69,926,833		66,013,147
Potentially dilutive common shares
Issuable pursuant to employee stock incentive plans		828,161		977,988		1,286,166
Class B		100		100		100
		74,266,370		70,904,921		67,299,413
Diluted earnings per share	$	2.28	$	1.07	$	1.25