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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 6,677 | $ 6,646
Accumulated Amortization | (3,880) | (3,768)
Net Carrying Amount | $ 2,797 | 2,878
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 3,747 | 3,739
Accumulated Amortization | (2,329) | (2,269)
Net Carrying Amount | $ 1,418 | 1,470
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 10 years |
Gross Carrying Amount | $ 1,088 | 1,081
Accumulated Amortization | (530) | (513)
Net Carrying Amount | $ 558 | 568
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 23 years |
Gross Carrying Amount | $ 503 | 497
Accumulated Amortization | (252) | (244)
Net Carrying Amount | $ 251 | 253
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 934 | 925
Accumulated Amortization | (412) | (394)
Net Carrying Amount | $ 522 | 531
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 4 years |
Gross Carrying Amount | $ 150 | 150
Accumulated Amortization | (127) | (122)
Net Carrying Amount | $ 23 | 28
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 6 years |
Gross Carrying Amount | $ 255 | 254
Accumulated Amortization | (230) | (226)
Net Carrying Amount | $ 25 | $ 28

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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/disclosureRef -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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