Stock Inventive and Ownership Plans Employee Stock Purchase Plan (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

Information related to shares issued or to be issued in connection with the employee stock purchase plan based on employee contributions and the range of purchase prices is as follows:

	Year Ended December 31,
	2019				2018				2017
Shares issued or to be issued (in thousands)	2,196				2,452				2,491
Range of purchase prices	$	29.29	-	$36.47	$	21.49	-	$27.91	$	18.60	-	$21.07
Expense recognized (in millions)	$	19			$	17			$	13