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Nature of Business and Basis of Presentation - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 01, 2021 | Oct. 22, 2021 | Aug. 31, 2021 | Mar. 12, 2021
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Title Business |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Cash |  |  |  |  | $ 450
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  | $ 500
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | $ 487 |  |  |  |
Disposal Group, Not Discontinued Operation, Transaction Cost | 7 |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Title Business | Blend Labs, Inc. | Mr. Cooper Group Inc. |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 9.90%
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Valuations Business |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Cash |  |  |  | $ 9 |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  | 16 |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | 7 |  |  |  |
Disposal Group, Not Discontinued Operation, Transaction Cost | 0 |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration, Common Stock |  |  |  | $ 7 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Valuations Business | Cyprexx Services LLC | Mr. Cooper Group Inc. |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 10.00% |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Field Services Business |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Cash |  |  | $ 36 |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  | $ 41 |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | 34 |  |  |  |
Disposal Group, Not Discontinued Operation, Transaction Cost | $ 0 |  |  |  |
Discontinued Operations, Held-for-sale or Disposed of by Sale | Champion Mortgage |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 1,640 |  |  |

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