Shareholders' Equity and Dividend Availability (Table)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

Share repurchase activity and remaining repurchase capacity under the share repurchase authorization [Table Text Block]

The following table summarizes repurchase activity in 2018 and remaining repurchase capacity at December 31, 2018.

(in millions, except per share amounts) Quarterly Period Ending	Number of shares repurchased	Cost of shares repurchased		Average price paid per share		Remaining capacity under share repurchase authorization
March 31, 2018	2.5	$	350	$	141.84	$	4,206
June 30, 2018	2.7	350		129.66		3,856
September 30, 2018	3.0	400		130.22		3,456
December 31, 2018	1.4	170		125.09		3,286
Total	9.6	$	1,270	132.33		3,286