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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 7,066 | $ 6,681
Accumulated Amortization | (3,146) | (2,579)
Net Carrying Amount | $ 3,920 | 4,102
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 12 years |
Gross Carrying Amount | $ 3,980 | 3,619
Accumulated Amortization | (1,856) | (1,550)
Net Carrying Amount | $ 2,124 | 2,069
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 11 years |
Gross Carrying Amount | $ 1,011 | 1,037
Accumulated Amortization | (414) | (386)
Net Carrying Amount | $ 597 | 651
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 25 years |
Gross Carrying Amount | $ 767 | 684
Accumulated Amortization | (353) | (196)
Net Carrying Amount | $ 414 | 488
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 13 years |
Gross Carrying Amount | $ 884 | 932
Accumulated Amortization | (233) | (187)
Net Carrying Amount | $ 651 | 745
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 4 years |
Gross Carrying Amount | $ 139 | 147
Accumulated Amortization | (89) | (84)
Net Carrying Amount | $ 50 | 63
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 5 years |
Gross Carrying Amount | $ 285 | 262
Accumulated Amortization | (201) | (176)
Net Carrying Amount | $ 84 | $ 86

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