Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Schedule Of Changes In Shares Of Common Stock Outstanding

The changes in shares of our common stock outstanding were as follows: 

(In millions)	2019		2018		2017
Beginning balance	282.1		288.4		292.8
Stock plans activity	1.1		0.9		1.1
Share repurchases	(4.8	)	(7.2	)	(5.5	)
Ending balance	278.4		282.1		288.4

Repurchases of Common Stock

Our share repurchases were as follows:

	2019			2018			2017
(In millions)	$		Shares	$		Shares	$		Shares
Shares repurchased under our share repurchase programs	$	800	4.4	$	1,325	6.7	$	800	4.9
Shares repurchased to satisfy tax withholding obligations	69		0.4	93		0.5	85		0.6
Total share repurchases	$	869	4.8	$	1,418	7.2	$	885	5.5