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Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Business Combinations [Abstract] |  |  |  |
Beginning balance | $ 169 | $ 231 | $ 249 | $ 252
Additions to estimated acquisition earn-out payables | 8 | 11 | 28 | 50
Payments for estimated acquisition earn-out payables | (38) | (11) | (135) | (74)
Subtotal | 139 | 231 | 142 | 228
Net change in earnings from estimated acquisition earn-out payables: |  |  |  |
Change in fair value on estimated acquisition earn-out payables | (9) | 28 | (15) | 23
Interest expense accretion | 1 | 2 | 6 | 7
Net change in earnings from estimated acquisition earn-out payables | (8) | 30 | (9) | 30
Foreign currency translation adjustments during the year | 6 | (3) | 4 | 0
Ending balance | $ 137 | $ 258 | $ 137 | $ 258

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