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Business Acquisitions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 23, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 1,913 | $ 1,913 |  | $ 1,913 |  | $ 1,290
Revenues |  |  | 5,092 | $ 4,789 | 10,032 | $ 9,480 |
Net Income (Loss) Available to Common Stockholders, Basic |  |  | 372 | $ 582 | 997 | $ 1,179 |
The Navigators Group, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | May 23, 2019 |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Navigators Group |  |  |  |  |  |
Business Acquisition, Share Price | $ 70 |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 2,121 |  |  |  |  |  |
Business Combination, Consideration Transferred, Other | 23 |  |  |  |  |  |
Goodwill | 623 |  |  |  |  |  |
Revenues |  | 178 |  |  |  |  |
Net Income (Loss) Available to Common Stockholders, Basic |  | $ 141 |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | 15 |  |
The Navigators Group, Inc. [Member] | Cash [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 2,098 |  |  |  |  |  |
Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Reinsurance premium |  |  |  |  | 91 |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  | 68 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims |  |  | 97 |  |  |  |
Use of Retention Layer by Acquiree Prior to Acquisition | $ 32 |  |  |  |  |  |
Current accident year |  |  | 29 |  |  |  |
Policyholder Benefits and Claims Incurred, Ceded |  |  |  |  | 91 |  |
Adverse Development Cover Navigators Group [Member] | Remaining [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  |  |  | 209 |  |
Adverse Development Cover Navigators Group [Member] | After tax [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Reinsurance premium |  |  |  |  | 72 |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims |  |  | 77 |  |  |  |
Adverse Development Cover Navigators Group [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  |  |  | 300 |  |
Recorded by Acquiree Prior to Acquisition [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current accident year |  |  | $ 52 |  |  |  |
Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member] | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  | 100 |  |
Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member] | Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  | $ 1,816 |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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