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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 6,426 | $ 6,664
Accumulated Amortization | (3,062) | (2,975)
Net Carrying Amount | $ 3,364 | 3,689
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 11 years |
Gross Carrying Amount | $ 3,602 | 3,818
Accumulated Amortization | (1,792) | (1,801)
Net Carrying Amount | $ 1,810 | 2,017
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 10 years |
Gross Carrying Amount | $ 1,023 | 1,017
Accumulated Amortization | (479) | (430)
Net Carrying Amount | $ 544 | 587
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 26 years |
Gross Carrying Amount | $ 517 | 513
Accumulated Amortization | (229) | (209)
Net Carrying Amount | $ 288 | 304
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 13 years |
Gross Carrying Amount | $ 833 | 887
Accumulated Amortization | (235) | (232)
Net Carrying Amount | $ 598 | 655
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 4 years |
Gross Carrying Amount | $ 173 | 141
Accumulated Amortization | (108) | (94)
Net Carrying Amount | $ 65 | 47
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (Years) | 5 years |
Gross Carrying Amount | $ 278 | 288
Accumulated Amortization | (219) | (209)
Net Carrying Amount | $ 59 | $ 79

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