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Summary of Significant Accounting Policies - Accounts Receivable, net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, net
Bad debt expense	$ 0	$ 0	$ 0
Accounts receivable | Credit concentration | One customer
Accounts Receivable, net
Largest concentrations of credit for any one customer	8.00%	11.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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