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OTHER ITEMS IMPACTING COMPARABILITY - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2020 instrument	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net		$ 2	$ 19	$ 77
Workforce reduction charges			8
Number of instruments with early redemption | instrument	2
Offset By Recovery
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net		40
Discrete Commercial Claim
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net		28
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net		13	$ 8	13
Workforce reduction charges		10
Severance | UNITED KINGDOM
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net		12
Acquisition-related Costs | UNITED KINGDOM
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net		$ 6
Discontinued Insurance Liability Program and Shutdown of Leased Locations
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net				$ 44

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Debt Instrument, Number Of Instruments With Early Redemption

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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