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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 6,681 | $ 5,758
Accumulated Amortization | (2,579) | (2,093)
Net Carrying Amount | $ 4,102 | 3,665
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 3,619 | 2,893
Accumulated Amortization | (1,550) | (1,295)
Net Carrying Amount | $ 2,069 | 1,598
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 1,037 | 1,009
Accumulated Amortization | (386) | (316)
Net Carrying Amount | $ 651 | 693
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 26 years |
Gross Carrying Amount | $ 684 | 741
Accumulated Amortization | (196) | (150)
Net Carrying Amount | $ 488 | 591
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 14 years |
Gross Carrying Amount | $ 932 | 845
Accumulated Amortization | (187) | (124)
Net Carrying Amount | $ 745 | 721
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 4 years |
Gross Carrying Amount | $ 147 | 69
Accumulated Amortization | (84) | (64)
Net Carrying Amount | $ 63 | 5
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 4 years |
Gross Carrying Amount | $ 262 | 201
Accumulated Amortization | (176) | (144)
Net Carrying Amount | $ 86 | $ 57

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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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/presentationRef -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 + Details
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