Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 3,446	$ 3,707
Segment profit	224	259
Depreciation and amortization	255	285
Amortization of acquired intangible assets	89	104
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Subtotal	224	259
Interest income	49	20
Interest expense	(66)	(37)
Restructuring costs	(20)	(33)
Transaction, separation and integration-relation costs	(1)	(2)
Amortization of acquired intangible assets	(89)	(104)
Merger related indemnification	(11)	(10)
(Loss) gain on disposition of businesses	(5)	29
Impairment losses	(3)	0
Income before income taxes	78	122
Operating segments
Segment Reporting Information [Line Items]
Revenues	3,446	3,707
Segment profit	283	337
Depreciation and amortization	229	259
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Subtotal	283	337
All Other
Segment Reporting Information [Line Items]
Revenues	0	0
Segment profit	(59)	(78)
Depreciation and amortization	26	26
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Subtotal	(59)	(78)
GBS | Operating segments
Segment Reporting Information [Line Items]
Revenues	1,703	1,758
Segment profit	192	210
Depreciation and amortization	45	41
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Subtotal	192	210
GIS | Operating segments
Segment Reporting Information [Line Items]
Revenues	1,743	1,949
Segment profit	91	127
Depreciation and amortization	184	218
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]
Subtotal	$ 91	$ 127