Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciliation of the Earnings and Number of Shares Used in Calculations of Basic and Diluted Earnings Per Share

The table below presents the reconciliation of the earnings and number of shares used in our calculations of basic and diluted earnings per share:

	Three Months Ended
(in millions, except per share amounts)	March 31, 2018		March 31, 2017
Computation of Basic Earnings Per Share
Net income	$	398	$	371
Shares for basic earnings per share	358.4		384.9
Basic earnings per share	$	1.11	$	0.96
Computation of Diluted Earnings Per Share
Net income	$	398	$	371
Shares for basic earnings per share	358.4		384.9
Effect of dilutive securities
Share-based compensation	4.9		5.1
Shares for diluted earnings per share	363.3		390.0
Diluted earnings per share	$	1.09	$	0.95