REVISION OF PRIOR PERIOD FINANCIAL STATEMENTS - Revision to financial statements (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of services	$ 3,596	$ 3,999	$ 10,886	$ 12,233
Total costs and expenses	4,441	5,276	13,333	15,385
Income (loss) before income taxes	(138)	(720)	(563)	(1,499)
Provision for (benefit from) income taxes	(32)	11	74	311
Net income (loss)	(106)	(731)	(637)	(1,810)
Foreign currency translation adjustments	260	400	(229)	290
Other comprehensive income (loss), before tax	267	495	(207)	405
Other comprehensive income (loss), net of tax	265	470	(214)	375
Total comprehensive income (loss)	159	(262)	(850)	(1,435)
Accrued contract costs	402	498	402	498		$ 676
Total current liabilities	4,607	4,457	4,607	4,457		5,058
Other liabilities	389	522	389	522		449
Total liabilities	9,920	10,446	9,920	10,446		10,730
Net Parent investment							$ 7,102	$ 6,027
Common stock	4,397	4,284	4,397	4,284		4,315
Accumulated other comprehensive income (loss)	(1,303)	(1,143)	(1,303)	(1,143)		(1,089)	(1,614)	(1,182)
Total stockholders' equity before non-controlling interests	1,832	2,765	1,832	2,765		2,618
Total equity	1,930	2,767	1,930	2,767	$ 1,746	2,711	5,539	4,902
Cash flows from operating activities:
Net income (loss)	$ (106)	(731)	(637)	(1,810)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Taxes (including items settled with former Parent in prior-year period)			(36)	920
Other assets and other liabilities			$ (418)	650
As Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of services		4,011		12,252
Total costs and expenses		5,287		15,405
Income (loss) before income taxes		(732)		(1,519)
Provision for (benefit from) income taxes		8		305
Net income (loss)		(740)		(1,825)
Foreign currency translation adjustments		401		295
Other comprehensive income (loss), before tax		496		409
Other comprehensive income (loss), net of tax		470		379
Total comprehensive income (loss)		(270)		(1,446)
Accrued contract costs		585		585
Total current liabilities		4,544		4,544
Other liabilities		501		501
Total liabilities		10,511		10,511
Net Parent investment							7,045	5,976
Common stock		4,218		4,218
Accumulated other comprehensive income (loss)		(1,143)		(1,143)			(1,615)	(1,186)
Total stockholders' equity before non-controlling interests		2,700		2,700
Total equity		2,702		2,702			5,481	4,848
Cash flows from operating activities:
Net income (loss)		(740)		(1,825)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Taxes (including items settled with former Parent in prior-year period)				915
Other assets and other liabilities				670
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of services		(12)		(20)
Total costs and expenses		(12)		(20)
Income (loss) before income taxes		12		20
Provision for (benefit from) income taxes		3		5
Net income (loss)		9		15
Foreign currency translation adjustments		(1)		(4)
Other comprehensive income (loss), before tax		(1)		(4)
Other comprehensive income (loss), net of tax		(1)		(4)
Total comprehensive income (loss)		8		11
Accrued contract costs		(87)		(87)
Total current liabilities		(87)		(87)
Other liabilities		22		22
Total liabilities		(65)		(65)
Net Parent investment							57	51
Common stock		66		66
Accumulated other comprehensive income (loss)		(1)		(1)			1	4
Total stockholders' equity before non-controlling interests		65		65
Total equity		65		65			$ 57	$ 54
Cash flows from operating activities:
Net income (loss)		$ 9		15
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Taxes (including items settled with former Parent in prior-year period)				5
Other assets and other liabilities				$ (20)
Over-accrual of Accrued contract costs | Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Accrued contract costs						$ 87