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Insurance Contracts - Premium Earned (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Insurance [Line Items]
Premiums Earned, Net	$ 11	$ 15	$ 36	$ 36
Direct Premiums Written	(1)	(13)	(6)	(2)
Direct Premiums Earned	15	18	46	45
Assumed Reinsurance Premiums Written	0	0	0	0
Assumed Reinsurance Premiums Earned	0	0	0	1
Ceded Premiums Written	14	0	29	(1)
Ceded Reinsurance Premiums Earned	4	3	10	9
Premiums Written, Net	(15)	(13)	(36)	(2)
Premiums Receivable, Net	$ 327		$ 327		$ 370
Estimated Future Premium Payments Weighted Average Discounted Rate	2.20%		2.20%		2.20%
Weighted average period of future premiums			8 years 1 month 6 days		8 years 3 months 18 days
Reportable Geographical Components [Member] | United States [Member]
Insurance [Line Items]
Premiums Earned, Net	$ 7	9	$ 21	24
Reportable Geographical Components [Member] | United Kingdom [Member]
Insurance [Line Items]
Premiums Earned, Net	3	7	10	15
Reportable Geographical Components [Member] | Other International [Member]
Insurance [Line Items]
Premiums Earned, Net	$ 1	$ (1)	$ 5	$ (2)

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