Accrued Expenses and Other Current Liabilities - Summary of Restructuring and Other Related Reorganization Costs (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Restructuring Cost And Reserve [Line Items]
Accrued liability as of December 31, 2019		$ 203
Charges	$ 33	42
Accrued liability as of June 30, 2020	141	141
Restructuring and Other Related Reorganization Costs
Restructuring Cost And Reserve [Line Items]
Accrued liability as of December 31, 2019		1
Charges		42
Payments		(36)
Accrued liability as of June 30, 2020	$ 7	$ 7