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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,664	$ 6,681
Accumulated Amortization	(2,975)	(2,579)
Net Carrying Amount	$ 3,689	4,102
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period (Years)	12 years
Gross Carrying Amount	$ 3,818	3,619
Accumulated Amortization	(1,801)	(1,550)
Net Carrying Amount	$ 2,017	2,069
Service agreements
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period (Years)	11 years
Gross Carrying Amount	$ 1,017	1,037
Accumulated Amortization	(430)	(386)
Net Carrying Amount	$ 587	651
Pharmacy licenses
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period (Years)	26 years
Gross Carrying Amount	$ 513	684
Accumulated Amortization	(209)	(196)
Net Carrying Amount	$ 304	488
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period (Years)	13 years
Gross Carrying Amount	$ 887	932
Accumulated Amortization	(232)	(187)
Net Carrying Amount	$ 655	745
Technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period (Years)	4 years
Gross Carrying Amount	$ 141	147
Accumulated Amortization	(94)	(84)
Net Carrying Amount	$ 47	63
Other
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period (Years)	5 years
Gross Carrying Amount	$ 288	262
Accumulated Amortization	(209)	(176)
Net Carrying Amount	$ 79	$ 86

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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+ References

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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