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v3.19.1

Basis of Presentation and Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2019 | Aug. 22, 2018 | Mar. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative Effect on Retained Earnings, before Tax | $ 1 |  |  |
Operating Leases, Future Minimum Payments Due | 160 |  |  |
Operating Lease, Right-of-Use Asset | 150 |  | $ 157 |
Lease Incentive Receivable | $ 10 |  |  |
The Navigators Group, Inc. [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Business Acquisition, Share Price |  | $ 70 |  |
Business Combination, Consideration Transferred |  | $ 2,200 |  |
The Navigators Group, Inc. [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Amount Exceeding Recorded Value |  |  |  | $ 100
Reinsurance Retention Policy, Amount Retained |  |  |  | $ 1,816
The Navigators Group, Inc. [Member] | Maximum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  | 300 |
Reinsurance Retention Policy, Amount Retained |  |  | $ 1,916 |

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