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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (22)	$ 16
Other comprehensive income (loss):
Unrealized gains (losses) on investments	12	(8)
Total other comprehensive income (loss)	12	(8)
Comprehensive income (loss)	$ (10)	$ 8

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