Earnings Per Share - Schedule of Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 30, 2016
Earnings Per Share [Abstract]
Stock repurchased (in shares)	72	39	38
Cost of Shares	$ 4,671	$ 1,970	$ 1,056
Average Price Paid per Share (in dollars per share)	$ 64.64	$ 50.80	$ 27.52