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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) | May 23, 2019 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2018
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Accounting Standards Update 2017-04 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  | $ 0 |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  | $ (2,000,000) |
Retained Earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  | $ 0
Retained Earnings | Accounting Standards Update 2016-13 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  | $ (18,000,000) |
The Navigators Group, Inc. [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Business Acquisition, Share Price | $ 70 |  |  |
Business Combination, Consideration Transferred | $ 2,137,000,000 |  |  |

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