Equity And Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Equity And Earnings Per Share [Abstract]


	IBG, Inc.	Holdings	Total
Ownership %	17.8%	82.2%	100.0%
Membership interests	73,544,946	340,229,444	413,774,390

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 June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in millions, except share or per share amounts)
Basic earnings per share
Net income available for common stockholders	$	41	$	23	$	87	$	47
Weighted average shares of common stock outstanding
Class A		72,476,629		69,087,753		71,979,004		68,539,426
Class B		100		100		100		100
		72,476,729		69,087,853		71,979,104		68,539,526
Basic earnings per share	$	0.57	$	0.33	$	1.21	$	0.68

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 June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
	(in millions, except share or per share amounts)
Diluted earnings per share
Net income available for common stockholders	$	41	$	23	$	87	$	47
Weighted average shares of common stock outstanding
Class A
Issued and outstanding		72,476,629		69,087,753		71,979,004		68,539,426
Potentially dilutive common shares
Issuable pursuant to employee stock incentive plans		852,767		975,574		944,640		1,074,041
Class B		100		100		100		100
		73,329,496		70,063,427		72,923,744		69,613,567
Diluted earnings per share	$	0.57	$	0.32	$	1.20	$	0.67