Equity Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Direct Stock Purchase and Dividend Reinvestment Plan number of shares issued	less than one million	less than one million	less than one million
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	6.5	4.9	2.8
Shares issued to employees and directors under various benefit plans and stock purchase programs	8.0	7.0	7.0
Common stock repurchases (in shares)	5.0	7.0	6.0
Common stock repurchased	$ 320	$ 516	$ 426
December 2017 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 1,500