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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 |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | May 23, 2019
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 1,911 | $ 1,913 |
The Navigators Group, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash and invested assets | $ 3,851 |  |  | $ 3,848
Premiums receivable | 498 |  |  | 492
Reinsurance recoverables | 1,097 |  |  | 1,100
Prepaid reinsurance premiums | 238 |  |  | 238
Other intangible assets | 580 |  |  | 580
Property and equipment | 83 |  |  | 83
Other assets | 102 |  |  | 99
Total assets acquired | 6,449 |  |  | 6,440
Unpaid losses and loss adjustment expenses | 2,823 |  |  | 2,823
Unearned premiums | 1,219 |  |  | 1,219
Long-term debt | 284 |  |  | 284
Deferred income taxes, net | 47 |  |  | 48
Other liabilities | 576 |  |  | 568
Total liabilities assumed | 4,949 |  |  | 4,942
Net identifiable assets acquired | 1,500 |  |  | 1,498
Goodwill | 621 |  |  | 623
Net assets acquired | 2,121 |  |  | $ 2,121
Cash and invested assets, adjustment | 3 |  |  |
Premiums receivable, adjustment | 6 |  |  |
Reinsurance recoverables, adjustment | (3) |  |  |
Prepaid reinsurance premiums, adjustment | 0 |  |  |
Other intangible assets, adjustment | 0 |  |  |
Property and equipment, adjustment | 0 |  |  |
Other assets, adjustment | 3 |  |  |
Total assets acquired, adjustment | 9 |  |  |
Unpaid losses and loss adjustment expenses, adjustment | 0 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Revenue | 0 |  |  |
Long-term debt, adjustment | 0 |  |  |
Deferred income taxes, net, adjustment | (1) |  |  |
Other liabilities, adjustment | 8 |  |  |
Total liabilities assumed, adjustment | 7 |  |  |
Net identifiable assets acquired, adjustment | 2 |  |  |
Goodwill, adjustment | 2 |  |  |
Net assets acquired, adjustment | $ 0 |  |  |

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