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Summary of Significant Accounting Policies - Accounts Receivable, net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, net
Bad debt expense	$ 0	$ 0
Recovery related to bad debt expense previously written off			$ 1
Accounts receivable | Credit concentration
Accounts Receivable, net
Largest concentrations of credit for any one customer	11.00%	11.00%

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Amount of increase in allowance for credit loss on accounts receivable, from recovery.

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