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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	30.00%	10.50%	23.20%	(47.10%)
Income Tax Contingency [Line Items]
Uncertain tax benefits that may be paid within the next twelve months	$ 22		$ 22
Charge related to income tax uncertainties for prior year tax positions	$ 13
Deferred taxes, projected effective rate at which expected to reverse	21.00%		21.00%
Settlement payments offset liability increase			$ 44		$ 36
Increase in liability for uncertain tax benefits related to prior years	$ 8
Amount of accrued interest and penalties					$ 34
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%
Foreign Tax Authority
Income Tax Contingency [Line Items]
Tax credits					$ 10
Minimum
Income Tax Contingency [Line Items]
Payments to be remitted over next eight years	3		$ 3
Maximum
Income Tax Contingency [Line Items]
Payments to be remitted over next eight years	$ 8		$ 8