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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (28)	$ (53)	$ (85)	$ (29)
Other comprehensive loss:
Net unrealized losses on investments	(2)	(6)	(6)	(26)
Total other comprehensive loss	(2)	(6)	(6)	(26)
Comprehensive loss	$ (30)	$ (59)	$ (91)	$ (55)

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