Income Per Common Share (Tables)

6 Months Ended

Jun. 30, 2018

Schedule of reconciliations of the numerators and denominators used in the computations of basic and diluted earnings per common share

Reconciliations of the numerators and denominators used in the computations of basic and diluted income per common share were as follows, in millions:



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Numerator (basic and diluted):
Net income	$	211	$	163	$	360	$	301
Less: Allocation to unvested restricted stock awards	1		2		3		3
Net income available to common shareholders	$	210	$	161	$	357	$	298

Denominator:
Basic common shares (based upon weighted average)	306		315		308		316
Add: Stock option dilution	3		4		3		4
Diluted common shares	309		319		311		320