SCHEDULE I - CONDENSED FINANCIAL INFORMATION - Condensed Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue
Investment income and other revenue	$ 31,474	$ 2,301	$ 7,766
Total revenue	3,963,638	1,838,715	462,801
Operating Expenses
General and administrative expenses	309,783	265,078	166,655
Interest expense	22,623	4,720	3,514
Other expenses (income)	(2,415)	1,201	0
Loss on extinguishment of debt	0	20,178	0
Loss before income taxes	(610,075)	(570,580)	(405,780)
Income tax (benefit) provision	(523)	846	1,045
Net loss attributable to Oscar Health, Inc.	(606,275)	(572,606)	(406,825)
Parent
Revenue
Investment income and other revenue	8,274	3,225	2,903
Total revenue	8,274	3,225	2,903
Operating Expenses
General and administrative expenses	60,130	61,004	23,020
Interest expense	22,583	4,720	3,514
Other expenses (income)	(2,415)	1,201	0
Loss on extinguishment of debt	0	20,178	0
Loss before income taxes	(72,024)	(83,878)	(23,631)
Income tax (benefit) provision	2,703	(715)	0
Loss before equity in net loss of subsidiaries	(74,727)	(83,163)	(23,631)
Equity in net loss of subsidiaries	(531,548)	(489,443)	(383,194)
Net loss attributable to Oscar Health, Inc.	$ (606,275)	$ (572,606)	$ (406,825)