Leases - Cash Flows (Details) $ in Millions	3 Months Ended
	Mar. 30, 2019 USD ($)
Supplemental cash flow information:
Net cash used for operating activities related to operating leases	$ 33
Net cash used for operating activities related to finance leases	1
Net cash used for financing activities related to finance leases	4
Assets obtained in exchange for lease liabilities:
Operating leases	$ 27