Income Per Common Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

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 March 31,
	2019		2018
Numerator (basic and diluted):
Net income	$	116	$	149
Less: Allocation to unvested restricted stock awards	1		1
Net income available to common shareholders	$	115	$	148
Denominator:
Basic common shares (based upon weighted average)	293		310
Add: Stock option dilution	1		3
Diluted common shares	294		313