Consolidated Statements of Operations - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended							5 Months Ended	7 Months Ended	12 Months Ended
	Jul. 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Jul. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Service related, net		$ 259	$ 159							$ 418
Net gain on mortgage loans held for sale		83	93							176
Total revenues		342	252							594
Expenses:
Salaries, wages and benefits										337
General and administrative										370
Total expenses		275	432							707
Other income (expenses):
Interest income										256
Interest expense										(293)
Other income (expenses)										13
Total other income (expenses), net		(26)	2							(24)
(Loss) income before income tax (benefit) expense		41	(178)							(137)
Less: Income tax (benefit) expense		(979)	(42)							(1,021)
Net income (loss)		1,020	(136)							884
Less: Net income (loss) attributable to non-controlling interests		0	0							0
Net income attributable to Successor/Predecessor		1,020	(136)							884
Less: Undistributed earnings attributable to participating stockholders		9	0							8
Net income attributable to common stockholders		$ 1,011	$ (136)							$ 876
Net income per common share attributable to Successor/Predecessor:
Basic (in dollars per share)		$ 11.13	$ (1.50)							$ 9.65
Diluted (in dollars per share)		$ 10.99	$ (1.50)							$ 9.54
Predecessor
Revenues:
Service related, net	$ 120			$ 317	$ 464	$ 295	$ 252	$ 213	$ 283		$ 901	$ 1,043	$ 1,122
Net gain on mortgage loans held for sale	44			127	124	142	154	167	144		295	607	793
Total revenues	164			444	588	437	406	380	427		1,196	1,650	1,915
Expenses:
Salaries, wages and benefits											426	742	813
General and administrative											519	733	831
Total expenses	242			339	364	366	368	369	372		945	1,475	1,644
Other income (expenses):
Interest income											333	597	425
Interest expense											(388)	(731)	(665)
Other income (expenses)											6	3	(2)
Total other income (expenses), net	(5)			(26)	(18)	(13)	(26)	(40)	(52)		(49)	(131)	(242)
(Loss) income before income tax (benefit) expense	(83)			79	206	58	12	(29)	3		202	44	29
Less: Income tax (benefit) expense	(19)			21	46	17	5	(10)	1		48	13	13
Net income (loss)	(64)			58	160	41	7	(19)	2		154	31	16
Less: Net income (loss) attributable to non-controlling interests	0			0	0	0	0	1	0		0	1	(3)
Net income attributable to Successor/Predecessor	(64)			58	160	$ 41	$ 7	$ (20)	$ 2		154	30	19
Less: Undistributed earnings attributable to participating stockholders	0			0	0						0	0	0
Net income attributable to common stockholders	$ (64)			$ 58	$ 160						$ 154	$ 30	$ 19
Net income per common share attributable to Successor/Predecessor:
Basic (in dollars per share)	$ (0.65)			$ 0.59	$ 1.63	$ 0.42	$ 0.07	$ (0.20)	$ 0.02		$ 1.57	$ 0.31	$ 0.19
Diluted (in dollars per share)	$ (0.65)			$ 0.59	$ 1.61	$ 0.41	$ 0.07	$ (0.20)	$ 0.02		$ 1.55	$ 0.30	$ 0.19