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Segment and Geographic Information - Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]      
Revenues $ 12,871 $ 13,667 $ 14,430
Costs of services (9,770) (10,576) (11,246)
Selling, general and administrative (1,348) (1,244) (1,375)
Segment Profit 1,019 1,009 1,136
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Subtotal 1,019 1,009 1,136
Interest income 199 214 135
Interest expense (265) (298) (200)
Restructuring costs (153) (111) (216)
Transaction, separation and integration-related costs (25) (7) (16)
Amortization of acquired intangibles (348) (354) (402)
Merger related indemnification (2) (16) (46)
SEC matter 0 0 (8)
Gains on dispositions 13 115 190
(Losses) gains on real estate and facility sales (23) 7 21
Arbitration loss 0 0 (29)
Impairment losses (17) (5) (19)
Pension and OPEB actuarial and settlement gains (losses) 232 (445) (1,431)
Income (loss) before income taxes 630 109 (885)
Operating segments      
Segment Reporting Information [Line Items]      
Revenues 12,871 13,667 14,430
Costs of services (9,784) (10,558) (10,957)
Selling, general and administrative (1,047) (987) (1,249)
Depreciation and amortization (848) (945) (1,018)
Other segment items 56 91 198
Segment Profit 1,248 1,268 1,404
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Subtotal 1,248 1,268 1,404
Operating segments | GBS      
Segment Reporting Information [Line Items]      
Revenues 6,646 6,820 6,960
Costs of services (5,081) (5,226) (5,237)
Selling, general and administrative (630) (603) (710)
Depreciation and amortization (162) (186) (165)
Other segment items 24 30 64
Segment Profit 797 835 912
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Subtotal 797 835 912
Operating segments | GIS      
Segment Reporting Information [Line Items]      
Revenues 6,225 6,847 7,470
Costs of services (4,703) (5,332) (5,720)
Selling, general and administrative (417) (384) (539)
Depreciation and amortization (686) (759) (853)
Other segment items 32 61 134
Segment Profit 451 433 492
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Subtotal 451 433 492
Unallocated expenses      
Segment Reporting Information [Line Items]      
Segment Profit (229) (259) (268)
Reconciliation of Consolidated Operating Income to Income Before Taxes [Abstract]      
Subtotal $ (229) $ (259) $ (268)