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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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