Basis of Presentation - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	Mar. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 669
Operating ROU assets	$ 593
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities		$ 648
Operating ROU assets		588
Deferred rent and exit cost accruals reclassified		$ 60