Summary of Significant Accounting Policies - Schedule of Reconciliation of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts, beginning balance	$ 8
Bad debt expense	7
Charge-offs	(4)
Allowance for doubtful accounts, ending balance	24	$ 8
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201613Member
Cumulative Effect, Period Of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts, beginning balance	$ 13
Allowance for doubtful accounts, ending balance		$ 13