Indebtedness - Debt Covenants (Details) - Revolving Credit Facility [Member] $ in Billions	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Minimum Net Worth Required for Compliance	$ 1.7
debt yield	9.80%
payout ratio	90.60%
Total leverage ratio	58.00%
Debt Instrument, Debt Covenant, Debt Service Coverage Ratio	1.87
Minimum [Member]
Debt Instrument [Line Items]
Minimum Net Worth Required for Compliance	$ 1.5
debt yield	850.00%
Debt Instrument, Debt Covenant, Debt Service Coverage Ratio	1.5
Maximum [Member]
Debt Instrument [Line Items]
payout ratio	9500.00%
Total leverage ratio	6500.00%

Amount of minimum net worth required for mortgage banking as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998

Name:	us-gaap_MinimumNetWorthRequiredForCompliance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant