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Business Acquisitions - Intangible Assets Recorded in Connection with the Acquisition (Details) - USD ($) |  | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 23, 2019 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 01, 2017
The Navigators Group, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 499,000,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | 81,000,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 580,000,000 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |  |
The Navigators Group, Inc. [Member] | Lloyd's Syndicate Capacity [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | $ 66,000,000 |  |  |  |
The Navigators Group, Inc. [Member] | License [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | 15,000,000 |  |  |  |
The Navigators Group, Inc. [Member] | Value of in-force contracts [1] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 180,000,000 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 1 year |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 180 |  |
The Navigators Group, Inc. [Member] | Distribution relationships [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 302,000,000 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 15 years |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | 302 |  |
The Navigators Group, Inc. [Member] | Trade Names [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 17,000,000 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |  |
Finite-lived Intangible Assets Acquired |  |  | $ 17 |  |
Aetna Group Insurance [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 629,000,000 | $ 629,000,000
Finite-lived Intangible Assets Acquired |  | $ 629,000,000 |  |  |
Aetna Group Insurance [Member] | Value of in-force contracts [1] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 1 year |  |  |
Finite-lived Intangible Assets Acquired |  | $ 23,000,000 |  |  |
Aetna Group Insurance [Member] | Customer relationships [2] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 15 years |  |  |
Finite-lived Intangible Assets Acquired |  | $ 590,000,000 |  |  |
Aetna Group Insurance [Member] | Marketing agreement with Aetna |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 15 years |  |  |
Finite-lived Intangible Assets Acquired |  | $ 16,000,000 |  |  |
Aetna Group Insurance [Member] | Software and Software Development Costs [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 5 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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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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