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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 7,193 | $ 6,681
Accumulated Amortization | (2,935) | (2,579)
Net Carrying Amount | $ 4,258 | 4,102
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 13 years |
Gross Carrying Amount | $ 4,038 | 3,619
Accumulated Amortization | (1,724) | (1,550)
Net Carrying Amount | $ 2,314 | 2,069
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 12 years |
Gross Carrying Amount | $ 1,020 | 1,037
Accumulated Amortization | (392) | (386)
Net Carrying Amount | $ 628 | 651
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 25 years |
Gross Carrying Amount | $ 766 | 684
Accumulated Amortization | (336) | (196)
Net Carrying Amount | $ 430 | 488
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 14 years |
Gross Carrying Amount | $ 938 | 932
Accumulated Amortization | (207) | (187)
Net Carrying Amount | $ 731 | 745
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 4 years |
Gross Carrying Amount | $ 146 | 147
Accumulated Amortization | (87) | (84)
Net Carrying Amount | $ 59 | 63
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 5 years |
Gross Carrying Amount | $ 285 | 262
Accumulated Amortization | (189) | (176)
Net Carrying Amount | $ 96 | $ 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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