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Goodwill & Other Intangible Assets - Other Intangible Assets (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amortized Intangible Assets: |  |  |
Finite-Lived Intangible Assets, Gross | $ 1,274,000,000 | $ 775,000,000 |
Accumulated Amortization | (299,000,000) | (132,000,000) |
Net Carrying Amount | 975,000,000 | 643,000,000 |
Total Indefinite Life Intangible Assets [5] | 95,000,000 | 14,000,000 |
Total Other Intangible Assets | 1,369,000,000 | 789,000,000 |
Total Other Intangible Assets | 1,070,000,000 | 657,000,000 |
Value of in-force contracts [1] |  |  |
Amortized Intangible Assets: |  |  |
Finite-Lived Intangible Assets, Gross | 203,000,000 | 23,000,000 |
Accumulated Amortization | (125,000,000) | (23,000,000) |
Net Carrying Amount | 78,000,000 | 0 |
Value of in-force contracts [1] | The Navigators Group, Inc. [Member] |  |  |
Amortized Intangible Assets: |  |  |
Finite-lived Intangible Assets Acquired | $ 180 |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Customer relationships [2] |  |  |
Amortized Intangible Assets: |  |  |
Finite-Lived Intangible Assets, Gross | $ 636,000,000 | 636,000,000 |
Accumulated Amortization | (92,000,000) | (49,000,000) |
Net Carrying Amount | 544,000,000 | 587,000,000 |
Customer relationships [2] | The Navigators Group, Inc. [Member] |  |  |
Amortized Intangible Assets: |  |  |
Accumulated Amortization | 102,000,000 | 0 | $ 0
Customer relationships [2] | Foremost [Domain] |  |  |
Amortized Intangible Assets: |  |  |
Finite-lived Intangible Assets Acquired |  | $ 46,000,000 |
Finite-Lived Intangible Asset, Useful Life |  | 10 years |
Marketing agreement with Aetna |  |  |
Amortized Intangible Assets: |  |  |
Finite-Lived Intangible Assets, Gross | 16,000,000 | $ 16,000,000 |
Accumulated Amortization | (2,000,000) | (1,000,000) |
Net Carrying Amount | 14,000,000 | 15,000,000 |
Distribution Agreement |  |  |
Amortized Intangible Assets: |  |  |
Finite-Lived Intangible Assets, Gross | 79,000,000 | 79,000,000 |
Accumulated Amortization | (61,000,000) | (56,000,000) |
Net Carrying Amount | 18,000,000 | 23,000,000 |
Distribution and Agency relationships & Other [3] [4] |  |  |
Amortized Intangible Assets: |  |  |
Finite-Lived Intangible Assets, Gross | 340,000,000 | 21,000,000 |
Accumulated Amortization | (19,000,000) | (3,000,000) |
Net Carrying Amount | 321,000,000 | 18,000,000 |
Distribution and Agency relationships & Other [3] [4] | Y-Risk [Domain] |  |  |
Amortized Intangible Assets: |  |  |
Finite-lived Intangible Assets Acquired |  | $ 12,000,000 |
Finite-Lived Intangible Asset, Useful Life |  | 15 years |
Distribution relationships [Member] | The Navigators Group, Inc. [Member] |  |  |
Amortized Intangible Assets: |  |  |
Finite-lived Intangible Assets Acquired | $ 302 |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |
Trade Names [Member] | The Navigators Group, Inc. [Member] |  |  |
Amortized Intangible Assets: |  |  |
Finite-lived Intangible Assets Acquired | $ 17 |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |
License [Member] | The Navigators Group, Inc. [Member] |  |  |
Amortized Intangible Assets: |  |  |
Indefinite-lived Intangible Assets Acquired | $ 15 |  |
Lloyd's Syndicate Capacity [Member] | The Navigators Group, Inc. [Member] |  |  |
Amortized Intangible Assets: |  |  |
Indefinite-lived Intangible Assets Acquired | $ 66 |  |

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