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Business Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed at the Acquisition Date (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | May 23, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 1,911 | $ 1,913 |  | $ 1,290
Goodwill, Purchase Accounting Adjustments |  | (2) |  |  |
The Navigators Group, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 3,851 |  | $ 3,848 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premiums Receivable |  | 498 |  | 492 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Reinsurance Recoverables |  | 1,097 |  | 1,100 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Prepaid Reinsurance Premiums |  | 238 |  | 238 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 580 |  | 580 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  | 83 |  | 83 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets |  | 102 |  | 99 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 6,449 |  | 6,440 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Unpaid Losses and Loss Adjustment Expenses |  | 2,823 |  | 2,823 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue |  | 1,219 |  | 1,219 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  | 284 |  | 284 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities |  | 47 |  | 48 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other |  | 576 |  | 568 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 4,949 |  | 4,942 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 1,500 |  | 1,498 |
Goodwill |  | 621 |  | 623 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | $ 2,121 |  | $ 2,121 |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash and Cash Equivalents | $ 3 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Premiums Receivable | 6 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Reinsurance Recoverables | (3) |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Prepaid Reinsurance Premiums | 0 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles | 0 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment | 0 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets | 3 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Assets | 9 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Unpaid Loss and Loss Adjustment Expenses | 0 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Liability for Future Policy Benefits | 0 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Long-term Debt | 0 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Income Taxes | (1) |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities | 8 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Liabilities | 7 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets and Liabilities, Net | 2 |  |  |  |
Goodwill, Purchase Accounting Adjustments | (2) |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Assets Liabilities and Goodwill, Net | $ 0 |  |  |  |

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