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Income Taxes - Reconciliation Between Effective Tax Rate On Income From Continuing Operations And Statutory Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate	$ 2,411	$ 1,137	$ 930
State income taxes net of federal tax benefit	153	92	81
Foreign income taxed at various rates	(326)	(295)	(247)
Unrecognized tax benefits and settlements	57	(14)	10
Controlled substance distribution reserve	0	0	58
Non-deductible goodwill impairment	106	0	0
Share-Based Compensation excess tax deduction	(54)	0	0
Net tax benefit on intellectual property transfer	(137)	0	0
Rate differential on gain from Change Healthcare Net Asset Exchange	(587)	0	0
Other, net	(9)	(12)	(17)
Income tax expense	$ 1,614	$ 908	$ 815

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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