Debt and Other Commitments - Leases Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Feb. 28, 2017
Other Commitments [Line Items]
Obligations under financing leases	$ 269	$ 113
Build-to-suit lease liability		144
Rent expense	55	46	$ 46
Interest portion of lease expense	13
Deferred rent	123	115
Long-term portion, deferred rent	119	$ 113
Construction in Progress and Build to Suit Lease Liability
Other Commitments [Line Items]
Obligations under financing leases	$ 165
GRAIL, Inc.
Other Commitments [Line Items]
Build-to-suit lease liability				$ 58
Build to suit lease, asset under construction				$ 58