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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 6,636 | $ 5,758
Accumulated Amortization | (2,430) | (2,093)
Net Carrying Amount | $ 4,206 | 3,665
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 12 years |
Gross Carrying Amount | $ 3,472 | 2,893
Accumulated Amortization | (1,378) | (1,295)
Net Carrying Amount | $ 2,094 | 1,598
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 12 years |
Gross Carrying Amount | $ 1,041 | 1,009
Accumulated Amortization | (351) | (316)
Net Carrying Amount | $ 690 | 693
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 26 years |
Gross Carrying Amount | $ 798 | 741
Accumulated Amortization | (308) | (150)
Net Carrying Amount | $ 490 | 591
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 14 years |
Gross Carrying Amount | $ 910 | 845
Accumulated Amortization | (156) | (124)
Net Carrying Amount | $ 754 | 721
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 5 years |
Gross Carrying Amount | $ 151 | 69
Accumulated Amortization | (74) | (64)
Net Carrying Amount | $ 77 | 5
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 5 years |
Gross Carrying Amount | $ 264 | 201
Accumulated Amortization | (163) | (144)
Net Carrying Amount | $ 101 | $ 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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