Accounting Standards (Details) - USD ($) $ in Millions	Sep. 27, 2019	Dec. 29, 2018	Dec. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease ROU assets	$ 403
Assets - non-current:
Property, plant and equipment, net	228	$ 238	$ 237
Operating lease right-of-use assets, net	394	418	0
Liabilities - current:
Accounts payable and accrued liabilities	2,004	1,623	1,491
Long-term debt, current portion	77	80	72
Liabilities - non-current:
Long-term debt, net of current portion	2,939	2,980	3,052
Operating lease liabilities	295	320	0
Deferred tax liabilities	196	187	170
Other long-term liabilities	203	144	178
Equity:
Retained earnings	$ 764	420	$ 372
Adjustments due to ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease ROU assets		433
Lease liabilities		486
Assets - non-current:
Property, plant and equipment, net		1
Operating lease right-of-use assets, net		418
Liabilities - current:
Accounts payable and accrued liabilities		132
Long-term debt, current portion		8
Liabilities - non-current:
Long-term debt, net of current portion		(72)
Operating lease liabilities		320
Deferred tax liabilities		17
Other long-term liabilities		(34)
Equity:
Retained earnings		$ 48