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Business Combinations - Estimated Fair Values of Aggregate Assets and Liabilities Acquired (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Fair Value Of Assets And Liabilities Statement [Line Items] |  |
Cash paid | $ 121 |
Other payable | 7 |
Recorded earn-out payable | 19 | $ 40
Total consideration | 147 |
Maximum potential earn-out payable | 38 |
Allocation of purchase price: |  |
Cash and equivalents | 2 |
Fiduciary cash | 21 |
Other current assets | 7 |
Goodwill | 108 |
Total assets acquired | 175 |
Fiduciary liabilities | (21) |
Other current liabilities | (1) |
Total liabilities assumed | (22) |
Acquired non-controlling interest | (6) |
Net assets acquired | 147 |
Purchased Customer Accounts and Other |  |
Allocation of purchase price: |  |
Intangible assets | $ 37 |

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