Accounting Policies and Basis of Presentations (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Jan. 01, 2020	Dec. 31, 2019
Supplemental Cash Flow Information
Operating cash flows from operating leases	$ 107	$ 101
Operating cash flows from finance leases	3	1
Financing cash flows from finance leases	5	1
Operating lease assets obtained in exchange for new operating lease liabilities	46	62
Finance right of use assets obtained in exchange for new finance lease liabilities	$ 46	$ 31
Leases
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Finance lease right of use assets, net	$ 90			$ 50
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other Liabilities, Current
Finance lease liabilities	$ 10			5
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent
Non-current finance lease liabilities	$ 77			40
Recently issued accounting standards
Retained earnings	3,978			3,983
Allowance for credit losses	$ 29			$ 28
ASU 2016-13
Recently issued accounting standards
Retained earnings			$ (3)
Allowance for credit losses			$ 3