SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Property and Equipment
Capital leases	$ 36	$ 25
Total property and equipment subject to depreciation	257	240
Accumulated depreciation	(79)	(61)
Land	25	25
Total property and equipment	203	204
Home office building
Property and Equipment
Property and equipment subject to depreciation, gross	$ 160	$ 159
Useful life	25 years	25 years
Furniture
Property and Equipment
Useful life	10 years	10 years
Office equipment and machines
Property and Equipment
Useful life	5 years	5 years
Computers
Property and Equipment
Useful life	4 years	4 years
Data processing equipment
Property and Equipment
Property and equipment subject to depreciation, gross	$ 39	$ 36
Other, principally furniture and equipment
Property and Equipment
Property and equipment subject to depreciation, gross	$ 22	$ 20

Amount, before accumulated amortization, of right-of-use asset from finance lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
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-Subparagraph (a)
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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 1
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Amount, after accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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