Financial Instruments (Cash, Cash Equivalents, and Marketable Securities Fair Value Measurements) (Details) - USD ($) $ in Millions	Mar. 30, 2019	Dec. 29, 2018
Schedule of Investments [Line Items]
Total Fair Value	$ 1,194	$ 1,156
Cash and Cash Equivalents	978	1,078
Short-Term Marketable Securities	216	78
Level 1
Schedule of Investments [Line Items]
Total Fair Value	5	275
Cash and Cash Equivalents	5	275
Short-Term Marketable Securities	0	0
Level 2
Schedule of Investments [Line Items]
Total Fair Value	559	566
Cash and Cash Equivalents	343	488
Short-Term Marketable Securities	216	78
Cash
Schedule of Investments [Line Items]
Total Fair Value	630	315
Cash and Cash Equivalents	630	315
Short-Term Marketable Securities	0	0
Government money market funds | Level 1
Schedule of Investments [Line Items]
Total Fair Value	5	275
Cash and Cash Equivalents	5	275
Short-Term Marketable Securities	0	0
Commercial paper | Level 2
Schedule of Investments [Line Items]
Total Fair Value	559	566
Cash and Cash Equivalents	343	488
Short-Term Marketable Securities	$ 216	$ 78