Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash paid for:
Interest	$ 91	$ 68
Taxes on income, net of refunds	43	73
Operating:
ROU assets obtained in exchange for lease, net	(22)	0
Prepaid assets acquired under long-term financing	30	0
Investing:
Capital expenditures in accounts payable and accrued expenses	13	44
Capital expenditures through capital lease obligations	253	191
Assets acquired under long-term financing	235	56
Increase in deferred purchase price receivable	321	141
Financing:
Dividends declared but not yet paid	57	55
Income tax refunds	13	$ 74
Change in lease classification from operating to finance lease	$ 87