NET LOSS PER SHARE - Schedule of Net Loss Per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Loss from continuing operations, net noncontrolling interests and accrued preferred stock dividends									$ (773,316)	$ (329,607)	$ (161,222)
Loss from discontinued operations	$ (480,327)	$ (69,339)	$ (155,134)	$ (17,115)	$ (646,761)	$ (217,288)	$ (14,281)	$ 23,075	(721,915)	(855,255)	(87,220)
Net loss attributable to Bright Health Group, Inc. common shareholders	$ (680,408)	$ (326,524)	$ (383,771)	$ (104,528)	$ (817,309)	$ (297,873)	$ (44,518)	$ (25,162)	$ (1,495,231)	$ (1,184,862)	$ (248,442)
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, basic (in shares)									629,459	392,243	136,193
Weighted-average number of shares outstanding used to compute net loss per share attributable to common stockholders, diluted (in shares)									629,459	392,243	136,193
Continuing operations, basic (in dollars per share)	$ (0.32)	$ (0.41)	$ (0.36)	$ (0.14)	$ (0.27)	$ (0.13)	$ (0.19)	$ (0.34)	$ (1.23)	$ (0.84)	$ (1.18)
Continuing operations, diluted (in dollars per share)	(0.32)	(0.41)	(0.36)	(0.14)	(0.27)	(0.13)	(0.19)	(0.34)	(1.23)	(0.84)	(1.18)
Discontinued operations, diluted (in dollars per share)	(0.76)	(0.11)	(0.25)	(0.03)	(1.03)	(0.34)	(0.09)	0.16	(1.15)	(2.18)	(0.64)
Discontinued operations, basic (in dollars per share)	(0.76)	(0.11)	(0.25)	(0.03)	(1.03)	(0.34)	(0.09)	0.16	(1.15)	(2.18)	(0.64)
Basic loss per share (in dollars per share)	(1.08)	(0.52)	(0.61)	(0.17)	(1.30)	(0.47)	(0.28)	(0.18)	(2.38)	(3.02)	(1.82)
Diluted loss per share (in dollars per share)	$ (1.08)	$ (0.52)	$ (0.61)	$ (0.17)	$ (1.30)	$ (0.47)	$ (0.28)	$ (0.18)	$ (2.38)	$ (3.02)	$ (1.82)