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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |
Aggregate purchase price of acquisitions |  | $ 267 | $ 26
Business combination, consideration transferred, including convertible notes | $ 5,600 |  |
Wright |  |  |
Business Acquisition [Line Items] |  |  |
Aggregate purchase price of acquisitions | $ 4,100 |  |
Consideration transferred (in dollars per share) | $ 30.75 |  |

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