Equity - Summary of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments	$ (1,473)	$ (1,426)
Cash flow hedges — unrealized net gain (loss)	(56)	(61)
Postretirement and postemployment benefits:
Net experience loss	32	34
Prior service cost	(4)	(4)
Total accumulated other comprehensive income (loss)	$ (1,501)	$ (1,457)