REAL ESTATE AND OTHER SECURITIES - Summary of Real Estate Securities (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) security bond	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Sales
Outstanding Face Amount	$ 31,488,837,000
Carrying Value	$ 14,606,157,000		$ 14,244,558,000
Weighted Average Life (Years)	1 year 6 months
Investments	$ 27,939,936,000
Bonds
Sales
Carrying Value	$ 324,500,000
Number of bonds which New Residential was unable to obtain rating information | bond	287
Residual Bonds
Sales
Investments	$ 27,900,000
Non-Agency Bonds
Sales
Investments	2,400,000
Agency RMBS
Purchases
Face	4,027,200,000	$ 7,140,000,000.0
Purchase price	4,203,100,000	7,290,000,000.0
Sales
Face	2,414,600,000	17,395,000,000.0
Amortized Cost Basis	2,513,400,000	17,679,300,000
Sale price	2,522,200,000	17,869,100,000
Gain (loss) on sale	8,900,000	189,800,000
Outstanding Face Amount	13,443,593,000
Amortized Cost Basis	13,956,269,000
Gross Unrealized Gains	9,207,000
Gross Unrealized Losses	(407,245,000)
Carrying Value	$ 13,558,231,000		13,063,634,000
Number of Securities | security	59
Weighted Average Rating	AAA
Weighted Average Coupon	2.20%
Weighted Average Yield	2.20%
Weighted Average Life (Years)	7 years 4 months 24 days
Agency RMBS | Fixed Rate Securities
Sales
Outstanding Face Amount	$ 13,400,000,000
Agency RMBS
Sales
Outstanding Face Amount	106,175,000
Amortized Cost Basis	106,935,000
Gross Unrealized Gains	8,955,000
Gross Unrealized Losses	0
Carrying Value	$ 115,890,000		121,761,000
Number of Securities | security	1
Weighted Average Rating	AAA
Weighted Average Coupon	3.50%
Weighted Average Yield	3.50%
Weighted Average Life (Years)	6 years 4 months 24 days
Agency RMBS at FVO
Sales
Outstanding Face Amount	$ 13,337,418,000
Amortized Cost Basis	13,849,334,000
Gross Unrealized Gains	252,000
Gross Unrealized Losses	(407,245,000)
Carrying Value	$ 13,442,341,000		12,941,873,000
Number of Securities | security	58
Weighted Average Rating	AAA
Weighted Average Coupon	2.20%
Weighted Average Yield	2.20%
Weighted Average Life (Years)	7 years 4 months 24 days
Real Estate Securities
Purchases
Face	$ 808,100,000	4,563,200,000
Purchase price	38,500,000	539,000,000.0
Sales
Face	1,133,600,000	7,200,000,000.0
Amortized Cost Basis	157,700,000	5,283,800,000
Sale price	147,900,000	4,358,900,000
Gain (loss) on sale	(9,900,000)	$ (924,900,000)
Outstanding Face Amount	18,045,244,000
Amortized Cost Basis	977,194,000
Gross Unrealized Gains	105,302,000
Gross Unrealized Losses	(34,569,000)
Carrying Value	$ 1,047,926,000		1,180,924,000
Number of Securities | security	579
Weighted Average Rating	AA
Weighted Average Coupon	2.60%
Weighted Average Yield	3.60%
Weighted Average Life (Years)	3 years 7 months 6 days
Weighted Average Principal Subordination	23.20%
Real Estate Securities | Fixed Rate Securities
Sales
Outstanding Face Amount	$ 11,000,000,000.0
Residual and interest - only notional amount	10,100,000,000
Real Estate Securities | Floating Rate Securities
Sales
Outstanding Face Amount	7,000,000,000.0
Residual and interest - only notional amount	6,900,000,000
Investments in Real Estate Securities
Sales
Outstanding Face Amount	31,488,837,000
Amortized Cost Basis	14,933,463,000
Gross Unrealized Gains	114,509,000
Gross Unrealized Losses	(441,814,000)
Carrying Value	$ 14,606,157,000		$ 14,244,558,000
Number of Securities | security	638
Weighted Average Rating	AAA
Weighted Average Coupon	2.40%
Weighted Average Yield	3.00%
Weighted Average Life (Years)	5 years 3 months 18 days
Corporate debt
Sales
Outstanding Face Amount	$ 500,000
Amortized Cost Basis	500,000
Gross Unrealized Gains	21,000
Gross Unrealized Losses	0
Carrying Value	$ 521,000
Number of Securities | security	1
Weighted Average Rating	B-
Weighted Average Coupon	8.30%
Weighted Average Yield	8.30%
Weighted Average Life (Years)	4 years
Consumer loan bonds
Sales
Outstanding Face Amount	$ 12,664,000
Amortized Cost Basis	12,731,000
Gross Unrealized Gains	740,000
Gross Unrealized Losses	0
Carrying Value	$ 13,471,000
Number of Securities | security	6
Interest-only securities
Sales
Outstanding Face Amount	$ 9,000,110,000
Amortized Cost Basis	237,469,000
Gross Unrealized Gains	21,764,000
Gross Unrealized Losses	(26,383,000)
Carrying Value	$ 232,850,000
Number of Securities | security	123
Weighted Average Rating	AA+
Weighted Average Coupon	1.30%
Weighted Average Yield	2.80%
Weighted Average Life (Years)	2 years
Servicing strips
Sales
Outstanding Face Amount	$ 4,444,047,000
Amortized Cost Basis	42,122,000
Gross Unrealized Gains	5,281,000
Gross Unrealized Losses	(6,369,000)
Carrying Value	$ 41,035,000
Number of Securities | security	56
Weighted Average Coupon	0.40%
Weighted Average Yield	14.90%
Weighted Average Life (Years)	4 years