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Fair Value Measurements - Fair Value by Balance Sheet Line Item (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financial assets |  |
Loans subject to repurchase from Ginnie Mae | $ 1,865 | $ 1,496
Financial liabilities |  |
Unsecured senior notes, net | 2,673 | 2,670
Advance and warehouse facilities, net | 2,885 | 4,997
Fair Value, Nonrecurring |  |
Financial assets |  |
Cash and cash equivalents | 527 | 895
Restricted cash | 175 | 146
Advances and other receivables, net | 1,019 | 1,228
Loans subject to repurchase from Ginnie Mae | 1,865 | 1,496
Financial liabilities |  |
Unsecured senior notes, net | 2,673 | 2,670
Advance and warehouse facilities, net | 2,885 | 4,997
Liability for loans subject to repurchase from Ginnie Mae | 1,865 | 1,496
Fair Value, Nonrecurring | Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 527 | 895
Restricted cash | 175 | 146
Advances and other receivables, net | 0 | 0
Loans subject to repurchase from Ginnie Mae | 0 | 0
Financial liabilities |  |
Unsecured senior notes, net | 0 | 2,737
Advance and warehouse facilities, net | 0 | 0
Liability for loans subject to repurchase from Ginnie Mae | 0 | 0
Fair Value, Nonrecurring | Level 2 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Advances and other receivables, net | 0 | 0
Loans subject to repurchase from Ginnie Mae | 1,865 | 1,496
Financial liabilities |  |
Unsecured senior notes, net | 2,209 | 0
Advance and warehouse facilities, net | 2,896 | 5,009
Liability for loans subject to repurchase from Ginnie Mae | 1,865 | 1,496
Fair Value, Nonrecurring | Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Advances and other receivables, net | 1,019 | 1,228
Loans subject to repurchase from Ginnie Mae | 0 | 0
Financial liabilities |  |
Unsecured senior notes, net | 0 | 0
Advance and warehouse facilities, net | 0 | 0
Liability for loans subject to repurchase from Ginnie Mae | $ 0 | $ 0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126999549&loc=SL98516268-108586 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 + Details
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