Financial Instruments (Details) (Cash and Cash Equivalents and Fair Value Measurements) - USD ($) $ in Millions		Mar. 26, 2016	Dec. 26, 2015
Schedule of Investments [Line Items]
Cash and cash equivalents, at fair value		$ 716	$ 785
Fair value, level 1 to level 2 transfers, amount		0	0
Fair value, level 2 to level 1 transfers, amount		0	0
Fair Value, Inputs, Level 2
Schedule of Investments [Line Items]
Cash and cash equivalents, at fair value		407	376
Cash
Schedule of Investments [Line Items]
Cash and cash equivalents, at fair value		309	409
Commercial Paper | Fair Value, Inputs, Level 2
Schedule of Investments [Line Items]
Cash and cash equivalents, at fair value	[1],[2]	$ 407	$ 376

[1] The Company did not have any transfers between Level 1 and Level 2 of the fair value hierarchy during the quarter ended March 26, 2016 or the year ended December 26, 2015.

[2] The Company’s Level 2 short-term investments are valued using broker reports that utilize quoted market prices for identical or comparable instruments. Brokers gather observable inputs for all of the Company’s fixed income securities from a variety of industry data providers and other third-party sources.