Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 01, 2019
ASU 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic benefit credits, other than service cost components	$ 14	$ 5
ASU 2016-02 | Scenario, Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right of use assets			$ 100