Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash paid for:
Interest	$ 250	$ 188
Taxes on income, net of refunds	120	235
Non-cash activities, Investing:
Capital expenditures in accounts payable and accrued expenses	62	4
Capital expenditures through capital lease obligations	548	510
Deferred purchase price receivable	1,194	527
Assets acquired under long-term financing	160	284
Contingent consideration	41	0
Non-cash activities, Financing:
Dividends declared but not yet paid	52	52
Stock issued for the acquisition of HPES	$ 0	$ 9,850