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Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Summary of Significant Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Significant non-cash investing and financing activities |  |  |
Other payables issued for agency acquisitions and purchased customer accounts | $ 27 | $ 12 | $ 6
Estimated acquisition earn-out payables and related charges | 73 | 67 | 73
Assumed acquisition earn-out payables | 3 | 21 | 35
Common stock issued for agency acquisition | $ 0 | $ 18 | $ 15

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