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Business Acquisitions - Additional Information (Details) - USD ($) |  |  | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | May 23, 2019 | Dec. 31, 2017 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 01, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 1,913,000,000 |  | $ 1,290,000,000 | $ 1,913,000,000 |  |  |  | $ 1,290,000,000 |  |  |  | $ 1,913,000,000 |  | $ 1,913,000,000 | $ 1,290,000,000 | $ 1,290,000,000 |
Change in Deferred Gain on Retroactive Reinsurance | 16,000,000 |  | 0 | 16,000,000 |  |  |  | 0 |  |  |  | 16,000,000 |  | 16,000,000 | 0 | 0 |
Change in Deferred Gain on Retroactive Reinsurance, Net of Tax | 13,000,000 |  |  | 13,000,000 |  |  |  |  |  |  |  | 13,000,000 |  | 13,000,000 |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,951,000,000 | 1,780,000,000 | 1,603,000,000 |
Revenues |  |  |  | 5,361,000,000 | $ 5,347,000,000 | $ 5,092,000,000 | $ 4,940,000,000 | 4,633,000,000 | $ 4,842,000,000 | $ 4,789,000,000 | $ 4,691,000,000 |  |  | 20,740,000,000 | 18,955,000,000 | 17,162,000,000 |
Net income (loss) available to common stockholders |  |  |  | 543,000,000 | $ 524,000,000 | 372,000,000 | $ 625,000,000 | 190,000,000 | 432,000,000 | $ 582,000,000 | $ 597,000,000 |  |  | 2,064,000,000 | 1,801,000,000 | $ (3,131,000,000) |
Adverse Development Cover Navigators Group [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance premium |  |  |  |  |  | 91,000,000 |  |  |  |  |  | 91,000,000 |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  |  | 68,000,000 |  |  |  |  |  |  |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims |  |  |  |  |  | 97,000,000 |  |  |  |  |  | 97,000,000 |  | 84,000,000 |  |  |
Current accident year |  |  |  |  |  | 29,000,000 |  |  |  |  |  |  |  |  |  |  |
Use of Retention Layer by Acquiree Prior to Acquisition |  | $ 32,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adverse development from comprehensive annual review |  |  |  |  |  | $ 91,000,000 |  |  |  |  |  |  |  | 107,000,000 |  |  |
Change in Deferred Gain on Retroactive Reinsurance | 16,000,000 |  |  | $ 16,000,000 |  |  |  |  |  |  |  | 16,000,000 |  | 16,000,000 |  |  |
Adverse Development Cover Navigators Group [Member] | Remaining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured | $ 193,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adverse Development Cover Navigators Group [Member] | After tax [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance premium |  |  |  |  |  |  |  |  |  |  |  | 72,000,000 |  |  |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims |  |  |  |  |  |  |  |  |  |  |  | 77,000,000 |  |  |  |  |
Adverse Development Cover Navigators Group [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance Retention Policy, Excess Retention, Amount Reinsured |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 |  |  |
Adverse Development Cover Navigators Group [Member] | Retention Layer Above Reserve for the Covered Liabilities as of the Inception Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |
Adverse development from comprehensive annual review |  |  |  |  |  |  |  |  |  |  |  |  |  | 207,000,000 |  |  |
Adverse Development Cover Navigators Group [Member] | Retention Layer for Reserve for the Covered Liabilities as of the Inception Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reinsurance Retention Policy, Amount Retained |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,816,000,000 |  |  |
Recorded by Acquiree Prior to Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current accident year |  | $ 52,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | $ 2,121,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Other |  | 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 623,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  |  |  |  | 67,000,000 |  |  |  |  |
Net Investment Income, after Tax |  |  |  |  |  |  |  |  |  |  |  | 54,000,000 |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000.0 |  |  |  |  |
Net income (loss) available to common stockholders |  |  |  |  |  |  |  |  |  |  |  | $ 167,000,000 |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,000,000 |  |  |
Business Combination, Consideration Transferred |  | $ 2,137,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Navigators Group, Inc. [Member] | Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 2,098,000,000.000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aetna Group Insurance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | 1,450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Other |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 723,000,000 |  |  |  |  |  |  | $ 723,000,000 |  | $ 723,000,000
Revenues |  |  | 370,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) available to common stockholders |  |  | 37,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  | 17,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  | $ 1,452,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Assets |  |  |  |  |  |  |  |  | 80,000,000 |  |  |  | $ 80,000,000 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Total Liabilities |  |  |  |  |  |  |  |  | $ 80,000,000 |  |  |  | $ 80,000,000 |  |  |  |
Aetna Group Insurance [Member] | Marketing agreement with Aetna |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired, Term of Agreement |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aetna Group Insurance [Member] | Computer Software, Intangible Asset [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aetna Group Insurance [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 723,000,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aetna Group Insurance [Member] | Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |

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