Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 22, 2017	Sep. 29, 2018	Jun. 30, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective tax rate		11.20%		(71.40%)	18.60%	(30.00%)
Income Tax Contingency [Line Items]
Deferred tax assets		$ 2			$ 2
Incremental income tax expense		2
Settlled income tax audits which included the use of previously recorded reserves		12
Charge related to income tax uncertainties for prior year tax positions			$ 14
Uncertain tax benefits that may be paid within the next twelve months		22			22
Settlement payments offset liability increase/tax (benefit)	$ 34				(3)
Tax credits		27			27
Cash liability to be paid in installments		$ 7			$ 7
Deferred tax assets and liabilities, rate expected to reverse in future		21.00%			21.00%
United Kingdom
Income Tax Contingency [Line Items]
Statutory tax rate					19.00%
Singapore
Income Tax Contingency [Line Items]
Statutory tax rate					17.00%
Luxembourg
Income Tax Contingency [Line Items]
Statutory tax rate					27.00%
Singapore Economic Development Board
Income Tax Contingency [Line Items]
Statutory tax rate							10.00%