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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 7,194 | $ 6,681
Accumulated Amortization | (3,066) | (2,579)
Net Carrying Amount | $ 4,128 | 4,102
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 12 years |
Gross Carrying Amount | $ 4,036 | 3,619
Accumulated Amortization | (1,797) | (1,550)
Net Carrying Amount | $ 2,239 | 2,069
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 12 years |
Gross Carrying Amount | $ 1,027 | 1,037
Accumulated Amortization | (406) | (386)
Net Carrying Amount | $ 621 | 651
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 25 years |
Gross Carrying Amount | $ 777 | 684
Accumulated Amortization | (357) | (196)
Net Carrying Amount | $ 420 | 488
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 14 years |
Gross Carrying Amount | $ 925 | 932
Accumulated Amortization | (223) | (187)
Net Carrying Amount | $ 702 | 745
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 4 years |
Gross Carrying Amount | $ 141 | 147
Accumulated Amortization | (86) | (84)
Net Carrying Amount | $ 55 | 63
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 5 years |
Gross Carrying Amount | $ 288 | 262
Accumulated Amortization | (197) | (176)
Net Carrying Amount | $ 91 | $ 86

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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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