Recently Adopted and Recently Issued Accounting Guidance - Narrative (Detail) - USD ($) $ in Millions		3 Months Ended
	Mar. 30, 2012	Mar. 31, 2018	Mar. 31, 2017
Summary Of Significant Accounting Policies [Line Items]
Cash received for receivables	$ 50	$ 136	$ 95
Operating income (loss)		$ 333	283
Adjustments for New Accounting Pronouncement
Summary Of Significant Accounting Policies [Line Items]
Operating income (loss)			$ 38