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Stock-Based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	1 Months Ended	9 Months Ended
	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ 63	$ 44
Accelerated expense associated with vesting of outstanding equity awards		$ 21
CareAR Holdings, LLC \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options (in shares)	105
Stock-based compensation expense, pre-tax	$ 30
Stock options grants (in shares)	90
Straight-line basis over period	4 years 8 months 12 days
Expiration period	10 years
CareAR Holdings, LLC \| Graded vesting after years one and two of service period \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vest on a granted scheduled	10.00%
CareAR Holdings, LLC \| Graded vesting after years three and four of service period \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vest on a granted scheduled	20.00%
CareAR Holdings, LLC \| Graded vesting after year five of service period \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vest on a granted scheduled	40.00%
CareAR Holdings, LLC \| Minimum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	90 days
CareAR Holdings, LLC \| Maximum \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	1 year