Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash paid for:
Interest	$ 277	$ 250
Taxes on income, net of refunds	202	120
Operating:
ROU assets obtained in exchange for lease, net	314	0
Prepaid assets acquired under long-term financing	23	0
Investing:
Capital expenditures in accounts payable and accrued expenses	121	62
Capital expenditures through capital lease obligations	507	548
Assets acquired under long-term financing	282	160
(Decrease) / increase in deferred purchase price receivable	58	1,194
Contingent consideration	19	41
Financing:
Dividends declared but not yet paid	54	52
Income tax refunds	36	$ 166
Change in lease classification from operating to finance lease	$ 87