Financial Instruments (Cash, Cash Equivalents, and Marketable Securities Fair Value Measurements) (Details) - USD ($) $ in Millions		Sep. 29, 2018	Dec. 30, 2017
Schedule of Investments [Line Items]
Total Fair Value		$ 1,056	$ 1,185
Cash and Cash Equivalents		1,046	1,185
Short-Term Marketable Securities	[1]	10	0
Level 1
Schedule of Investments [Line Items]
Total Fair Value		205	395
Cash and Cash Equivalents		205	395
Short-Term Marketable Securities		0
Level 2
Schedule of Investments [Line Items]
Total Fair Value		759	682
Cash and Cash Equivalents		749	682
Short-Term Marketable Securities		10
Cash
Schedule of Investments [Line Items]
Total Fair Value		92	108
Cash and Cash Equivalents		92	108
Short-Term Marketable Securities		0
Government money market funds | Level 1
Schedule of Investments [Line Items]
Total Fair Value		205	395
Cash and Cash Equivalents		205	395
Short-Term Marketable Securities		0
Commercial paper | Level 2
Schedule of Investments [Line Items]
Total Fair Value		759	682
Cash and Cash Equivalents		749	$ 682
Short-Term Marketable Securities		$ 10

[1] Prior year amounts adjusted to reflect the retrospective application of ASU 2014-09, Revenue from Contracts with Customers. Refer to Note 1.