Other Intangible Assets (Summary of Other Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Schedule of Other Intangible Assets [Abstract]
Finite-lived intangible assets:	$ 18	$ 18
Indefinite-lived intangible assets:	64	62
Total other intangible assets	82	80
Accumulated Amortization	13	11
Syndicate capacity
Schedule of Other Intangible Assets [Abstract]
Indefinite-lived intangible assets:	48	46
Agency force
Schedule of Other Intangible Assets [Abstract]
Indefinite-lived intangible assets:	$ 16	16
Trade name
Schedule of Other Intangible Assets [Abstract]
Economic Useful Life	8 years
Finite-lived intangible assets:	$ 7	7
Accumulated Amortization	$ 7	6
Distribution channel
Schedule of Other Intangible Assets [Abstract]
Economic Useful Life	15 years
Finite-lived intangible assets:	$ 11	11
Accumulated Amortization	$ 6	$ 5