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Fair Value Measurements - Fair Value by Balance Sheet Line Item (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financial liabilities |  |
Unsecured senior notes, net | $ 4,891 | $ 3,151
Advance, warehouse and MSR facilities, net | 6,495 | 4,302
Fair Value, Nonrecurring |  |
Financial assets |  |
Cash and cash equivalents | 753 | 571
Restricted cash | 220 | 169
Advances and other receivables, net | 1,345 | 996
Loans subject to repurchase from Ginnie Mae | 1,176 | 966
Financial liabilities |  |
Unsecured senior notes, net | 4,891 | 3,151
Advance, warehouse and MSR facilities, net | 6,495 | 4,302
Liability for loans subject to repurchase from Ginnie Mae | 1,176 | 966
Fair Value, Nonrecurring | Level 1 |  |
Financial assets |  |
Cash and cash equivalents | 753 | 571
Restricted cash | 220 | 169
Advances and other receivables, net | 0 | 0
Loans subject to repurchase from Ginnie Mae | 0 | 0
Financial liabilities |  |
Unsecured senior notes, net | 0 | 0
Advance, warehouse and MSR 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 | 1,176 | 966
Financial liabilities |  |
Unsecured senior notes, net | 4,862 | 3,056
Advance, warehouse and MSR facilities, net | 6,515 | 4,318
Liability for loans subject to repurchase from Ginnie Mae | 1,176 | 966
Fair Value, Nonrecurring | Level 3 |  |
Financial assets |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Advances and other receivables, net | 1,345 | 996
Loans subject to repurchase from Ginnie Mae | 0 | 0
Financial liabilities |  |
Unsecured senior notes, net | 0 | 0
Advance, warehouse and MSR 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + 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://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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