Equity And Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Equity And Earnings Per Share [Abstract]


	IBG, Inc.	Holdings	Total
Ownership %	18.1%	81.9%	100.0%
Membership interests	75,097,443	338,691,717	413,789,160

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.



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(in millions, except share or per share amounts)
Basic earnings per share
Net income available for common stockholders	$	39	$	31	$	126	$	78
Weighted average shares of common stock outstanding
Class A		74,649,369		71,109,477		72,878,907		69,405,524
Class B		100		100		100		100
		74,649,469		71,109,577		72,879,007		69,405,624
Basic earnings per share	$	0.52	$	0.44	$	1.73	$	1.12

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.



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
	(in millions, except share or per share amounts)
Diluted earnings per share
Net income available for common stockholders	$	39	$	31	$	126	$	78
Weighted average shares of common stock outstanding
Class A
Issued and outstanding		74,649,369		71,109,477		72,878,907		69,405,524
Potentially dilutive common shares
Issuable pursuant to employee stock incentive plans		710,620		863,906		866,633		1,003,995
Class B		100		100		100		100
		75,360,089		71,973,483		73,745,640		70,409,619
Diluted earnings per share	$	0.51	$	0.43	$	1.71	$	1.10