Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 30, 2017
Income Taxes [Line Items]
Decrease to deferred tax liabilities			$ 7		$ 173
Adjustment to deferred income tax benefit		$ 173	8		4
Increase to deferred tax liabilities					4
Adjustment to other long-term liabilities					$ 4
Incremental to planned contributions			35
Provisional decrease to deferred tax liabilities			$ 1
Effective tax rate	19.00%	35.00%	16.00%	29.00%
Income tax benefit related to excess tax benefits		$ 7	$ 6	$ 27
Accounting Standards Update 2015-17 | Internal Revenue Service (IRS)
Income Taxes [Line Items]
Income tax benefit related to reduction of unrecognized tax benefit			$ 21