Income Taxes - Carryforward and Temporary Differences (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets
Loss carryforwards (federal, state and capital)	$ 1,334
Excess interest expense	10
Reverse mortgage interests	68
Loss reserves	69
Reverse mortgage premiums	1
Rent expense	1
Restricted share based compensation	1
Accruals	14
Partnership interests	7
Reverse mortgage purchase discount	1
Goodwill and intangible assets	4
Other, net	5
Total deferred tax assets	1,515
Deferred Tax Liabilities
MSR amortization and mark-to-market, net	(243)
Depreciation and amortization, net	(12)
Prepaid assets	(1)
Goodwill and intangible assets	0
Total deferred tax liabilities	(256)
Valuation allowance	(295)
Net deferred tax assets (liabilities)	$ 964
Predecessor
Deferred Tax Assets
Loss carryforwards (federal, state and capital)		$ 37
Excess interest expense		0
Reverse mortgage interests		0
Loss reserves		81
Reverse mortgage premiums		15
Rent expense		4
Restricted share based compensation		6
Accruals		10
Partnership interests		5
Reverse mortgage purchase discount		24
Goodwill and intangible assets		0
Other, net		3
Total deferred tax assets		185
Deferred Tax Liabilities
MSR amortization and mark-to-market, net		(174)
Depreciation and amortization, net		(20)
Prepaid assets		(2)
Goodwill and intangible assets		(1)
Total deferred tax liabilities		(197)
Valuation allowance		(4)
Net deferred tax assets (liabilities)		$ (16)