Net Income Per Common Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Calculations For Basic And Diluted Earnings Per Share

The table shows calculations for basic and diluted earnings per share:

(In millions, except per share data)	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
Numerator:
Net income—basic and diluted	$	553	$	102	$	739	$	403
Denominator:
Basic weighted-average common shares outstanding	162.7		164.0		163.3		164.3
Effect of share-based awards:
Stock options	0.8		1.1		0.9		1.1
Nonvested shares	0.5		0.8		0.5		0.7
Diluted weighted-average shares	164.0		165.9		164.7		166.1
Earnings per share:
Basic	$	3.40	$	0.62	$	4.53	$	2.45
Diluted	$	3.38	$	0.61	$	4.49	$	2.42
Number of anti-dilutive share-based awards	1.1		0.6		1.3		0.7