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Acquisitions - Narrative (Details) - USD ($) $ in Millions | Jan. 01, 2023 | Dec. 19, 2022 | Aug. 09, 2022 | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 4,830 | $ 4,635 | $ 4,602
TitlePoint |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration | $ 224 |  |  |  |  |
Goodwill | 165 |  |  |  |  |
Fair value estimates for other intangibles | 54 |  |  |  |  |
Fair value estimate for other assets | $ 6 |  |  |  |  |
AllFirst Title Insurance Agency |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash consideration |  | $ 10 | $ 130 |  |  |
Goodwill |  |  | 104 |  |  |
Fair value estimates for other intangibles |  |  | $ 55 |  |  |
Percentage of outstanding equity acquired |  | 6.00% | 74.00% |  |  |
Preliminary fair value allocation, other intangible assets |  |  | $ 55 |  |  |
Preliminary fair value allocation, other assets |  |  | 40 |  |  |
Preliminary fair value allocation, other liabilities |  |  | 18 |  |  |
Preliminary fair value allocation, noncontrolling interest |  |  | $ 46 |  |  |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479907/805-20-50-1 + Details
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