Equity - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Anti-dilutive potential common shares excluded from reconciliation	6	4
Common stock repurchased (in shares)		2
Common stock repurchased	$ 0	$ 125	$ 516
Treasury stock
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased (in shares)	0		7
Common stock repurchased	$ 0		$ 516
December 2017 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount			$ 1,500
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,500