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Business Acquisitions - Additional Information (Details) - The Navigators Group, Inc. [Member] - USD ($) $ in Millions |  | 3 Months Ended
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May 23, 2019 | Jun. 30, 2020
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | May 23, 2019 |
Payments to Acquire Businesses, Gross | $ 2,121 |
Total assets acquired, adjustment |  | $ 9
Total liabilities assumed, adjustment |  | 7
Goodwill, adjustment |  | $ 2

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