Summary of Significant Accounting Policies - Schedule of Adjustments Made Due to ASU 2016-02 (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating lease right-of-use assets	$ 100	$ 75
Other current liabilities	18	16
Operating lease non-current liabilities	82	57
Accumulated deficit	$ (681)	(181)	$ (181)
Accounting Standards Update 2016-02
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Operating lease right-of-use assets		75
Other current liabilities		16
Operating lease non-current liabilities		57
Accumulated deficit		$ 0