CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 102	$ 1,103	$ 197	$ 658
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			1,309	1,506
Operating right-of-use expense			371	463
Pension & other post-employment benefits, actuarial & settlement losses			7	2
Share-based compensation			77	42
Deferred taxes			17	(319)
Gain on dispositions			(402)	(2,023)
Provision for losses on accounts receivable			1	52	$ 53
Unrealized foreign currency exchange gain			(20)	(60)
Impairment losses and contract write-offs			21	68
Debt extinguishment costs	2	0	311	0
Other non-cash charges, net			1	(2)
Changes in assets and liabilities, net of effects of acquisitions and dispositions:
Decrease in assets			386	88
Decrease in operating lease liability			(371)	(463)
(Decrease) increase in other liabilities			(675)	392
Net cash provided by operating activities			1,230	404
Cash flows from investing activities:
Purchases of property and equipment			(217)	(215)
Payments for transition and transformation contract costs			(152)	(189)
Software purchased and developed			(211)	(209)
Payments for acquisitions, net of cash acquired			0	(10)
Business dispositions			519	4,942
Cash collections related to deferred purchase price receivable			0	159
Proceeds from sale of assets			95	27
Short-term investing			24	0
Other investing activities, net			35	(5)
Net cash provided by investing activities			93	4,500
Cash flows from financing activities:
Borrowings of commercial paper			840	854
Repayments of commercial paper			(821)	(1,327)
Borrowings under lines of credit			0	2,500
Repayment of borrowings under lines of credit			0	(4,000)
Borrowings on long-term debt			19	0
Principal payments on long-term debt			(2,872)	(2,926)
Payments on finance leases and borrowings for asset financing			(855)	(694)
Proceeds from bond issuance			2,918	993
Proceeds from stock options and other common stock transactions			12	1
Taxes paid related to net share settlements of share-based compensation awards			(15)	(5)
Payments for debt extinguishment costs			(344)	0
Repurchase of common stock and advance payment for accelerated share repurchase			(352)	0
Dividend payments			0	(53)
Other financing activities, net			10	(14)
Net cash used in financing activities			(1,460)	(4,671)
Effect of exchange rate changes on cash and cash equivalents			25	20
Net (decrease) increase in cash and cash equivalents including cash classified within current assets held for sale			(112)	253
Cash classified within current assets held for sale			63	(13)
Net (decrease) increase in cash and cash equivalents			(49)	240
Cash and cash equivalents at beginning of year			2,968	3,679	3,679
Cash and cash equivalents at end of period	$ 2,919	$ 3,919	$ 2,919	$ 3,919	$ 2,968