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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Mar. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 5,354 | $ 5,140
Accumulated Amortization | (2,211) | (2,119)
Net Carrying Amount | $ 3,143 | 3,021
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 8 years |
Gross Carrying Amount | $ 2,769 | 2,652
Accumulated Amortization | (1,383) | (1,324)
Net Carrying Amount | $ 1,386 | 1,328
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 14 years |
Gross Carrying Amount | $ 959 | 959
Accumulated Amortization | (283) | (269)
Net Carrying Amount | $ 676 | 690
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 25 years |
Gross Carrying Amount | $ 806 | 857
Accumulated Amortization | (127) | (121)
Net Carrying Amount | $ 679 | 736
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 14 years |
Gross Carrying Amount | $ 391 | 314
Accumulated Amortization | (99) | (96)
Net Carrying Amount | $ 292 | 218
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 2 years |
Gross Carrying Amount | $ 195 | 195
Accumulated Amortization | (185) | (182)
Net Carrying Amount | $ 10 | 13
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 4 years |
Gross Carrying Amount | $ 234 | 163
Accumulated Amortization | (134) | (127)
Net Carrying Amount | $ 100 | $ 36

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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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