Earnings Per Share - Calculation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended					9 Months Ended
	Jan. 20, 2021	Mar. 31, 2021	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income	$ 183,756	$ 676,249	$ 325,610	$ 215,445	$ 453,287	$ 329,857	$ 138,712	$ 994,342	$ 1,328,574
Net income attributable to non-controlling interests			313,914			304,611		952,350	1,247,079
Net income attributable to UWM Holdings Corporation			11,696			25,246		41,992	81,495
Numerator:
Net income attributable to Class A common shareholders			11,696			25,246		41,992	81,495
Net income attributable to Class A common shareholders - diluted			$ 11,696			$ 254,701		$ 41,992	$ 887,166
Weighted average shares outstanding:
Weighted average shares of Class A common stock outstanding - basic (in shares)			92,571,886			101,106,023		92,441,342	102,247,594
Weighted average shares of Class A common stock outstanding - diluted (in shares)			92,571,886			1,603,710,511		92,441,342	1,604,567,758
Earnings per share of Class A common stock outstanding - basic (in usd per share)			$ 0.13			$ 0.25		$ 0.45	$ 0.80
Earnings per share of Class A common stock outstanding - diluted (in usd per share)			$ 0.13			$ 0.16		$ 0.45	$ 0.55