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Goodwill & Other Intangible Assets - Other Intangible Assets (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Amortized Intangible Assets: |  |
Finite-Lived Intangible Assets, Gross | $ 1,274,000,000 | $ 1,274,000,000
Accumulated Amortization | (419,000,000) | (299,000,000)
Net Carrying Amount | 855,000,000 | 975,000,000
Total Indefinite Life Intangible Assets [4] | 95,000,000 | 95,000,000
Total Other Intangible Assets | 1,369,000,000 | 1,369,000,000
Total Other Intangible Assets | 950,000,000 | 1,070,000,000
Value of in-force contracts [1] |  |
Amortized Intangible Assets: |  |
Finite-Lived Intangible Assets, Gross | 203,000,000 | 203,000,000
Accumulated Amortization | (172,000,000) | (125,000,000)
Net Carrying Amount | 31,000,000 | 78,000,000
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 |  |
Amortized Intangible Assets: |  |
Finite-Lived Intangible Assets, Gross | $ 636,000,000 | 636,000,000
Accumulated Amortization | (134,000,000) | (92,000,000)
Net Carrying Amount | 502,000,000 | 544,000,000
Marketing agreement with Aetna |  |
Amortized Intangible Assets: |  |
Finite-Lived Intangible Assets, Gross | 16,000,000 | 16,000,000
Accumulated Amortization | (3,000,000) | (2,000,000)
Net Carrying Amount | 13,000,000 | 14,000,000
Distribution Agreement [2] |  |
Amortized Intangible Assets: |  |
Finite-Lived Intangible Assets, Gross | 79,000,000 | 79,000,000
Accumulated Amortization | (65,000,000) | (61,000,000)
Net Carrying Amount | 14,000,000 | 18,000,000
Distribution and Agency relationships & Other [3] |  |
Amortized Intangible Assets: |  |
Finite-Lived Intangible Assets, Gross | 340,000,000 | 340,000,000
Accumulated Amortization | (45,000,000) | (19,000,000)
Net Carrying Amount | 295,000,000 | $ 321,000,000
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 |
Distribution Agreement [Member] |  |
Amortized Intangible Assets: |  |
Finite-Lived Intangible Asset, Useful Life | 6 years 6 months |
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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