Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 4,089	$ 4,288	$ 12,257	$ 13,344
Segment profit	355	300	1,033	773
Depreciation and amortization	318	361	969	1,078
Amortization of acquired intangible assets	106	114	325	414
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	355	300	1,033	773
Interest income	15	28	51	76
Interest expense	(38)	(82)	(161)	(284)
Restructuring costs	(36)	(104)	(248)	(441)
Transaction, separation and integration-related costs	(11)	(96)	(23)	(307)
Amortization of acquired intangible assets	(106)	(114)	(325)	(414)
Gains and (losses) on dispositions	(4)	2,046	343	2,046
Impairment losses	0	0	(10)	0
Debt extinguishment costs	(2)	0	(311)	0
Pension and OPEB actuarial and settlement losses	(7)	0	(7)	(2)
Income before income taxes	166	1,978	342	1,447
Operating segments
Segment Reporting Information [Line Items]
Revenues	4,089	4,288	12,257	13,344
Segment profit	417	361	1,236	952
Depreciation and amortization	291	334	885	1,001
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	417	361	1,236	952
All Other
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Segment profit	(62)	(61)	(203)	(179)
Depreciation and amortization	27	27	84	77
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	(62)	(61)	(203)	(179)
GBS | Operating segments
Segment Reporting Information [Line Items]
Revenues	1,946	1,921	5,706	6,337
Segment profit	315	273	885	805
Depreciation and amortization	39	53	130	162
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	315	273	885	805
GIS | Operating segments
Segment Reporting Information [Line Items]
Revenues	2,143	2,367	6,551	7,007
Segment profit	102	88	351	147
Depreciation and amortization	252	281	755	839
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Segment profit	$ 102	$ 88	$ 351	$ 147