TRANSITION PERIOD - Income Statement (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			12 Months Ended
	Mar. 31, 2022		Mar. 31, 2021	Mar. 31, 2023		Dec. 31, 2021		Dec. 31, 2020
TRANSITION PERIOD
Revenues *	$ 4,431	[1]	$ 4,771	$ 17,026	[1]	$ 18,657	[1]	$ 19,352	[1]
Cost of services	3,824	[2]	4,318	14,498	[2]	16,550	[2]	17,137	[2]
Selling, general and administrative expenses	690		714	2,914		2,776		2,948
Workforce rebalancing charges			52	71		39		918
Transaction-related costs	58		55	264		627		21
Interest expense	21		14	94		64		63
Other expense	27		22	35		35		25
Total costs and expenses	4,620		5,175	17,876		20,560		21,112
Income (loss) before income taxes	(189)		(403)	(851)		(1,903)		(1,760)
Provision for income taxes	40		91	524		402		247
Net income (loss)	$ (229)		$ (494)	$ (1,374)		$ (2,304)		$ (2,007)
NET LOSS PER SHARE
Basic earnings (loss) per share (in dollars per share)	$ (1.02)		$ (2.20)	$ (6.06)		$ (10.28)		$ (8.96)
Diluted earnings (loss) per share (in dollars per share)	$ (1.02)		$ (2.20)	$ (6.06)		$ (10.28)		$ (8.96)
Weighted-average basic shares outstanding (in shares)	224.4		224.1	226.7		224.1		224.1
Weighted-average diluted shares outstanding (in shares)	224.4		224.1	226.7		224.1		224.1
Related-party revenue	$ 236		$ 154	$ 287		$ 704		$ 645
Related-party cost of services	$ 924		$ 1,006	$ 1,382		$ 3,979		$ 3,767

[1] Including related-party revenue of $287 for the year ended March 31, 2023, $236 for the three months ended March 31, 2022, $704 for the year ended December 31, 2021, and $645 for the year ended December 31, 2020

[2] Including related-party cost of service of $1,382 for the year ended March 31, 2023, $924 for the three months ended March 31, 2022, $3,979 for the year ended December 31, 2021, and $3,767 for the year ended December 31, 2020