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Goodwill And Intangible Assets, Net - Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Mar. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 5,220 | $ 5,204
Accumulated Amortization | (1,966) | (1,763)
Net Carrying Amount | $ 3,254 | 3,441
Customer lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 9 years |
Gross Carrying Amount | $ 2,686 | 2,683
Accumulated Amortization | (1,234) | (1,116)
Net Carrying Amount | $ 1,452 | 1,567
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 15 years |
Gross Carrying Amount | $ 945 | 957
Accumulated Amortization | (240) | (215)
Net Carrying Amount | $ 705 | 742
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 26 years |
Gross Carrying Amount | $ 897 | 874
Accumulated Amortization | (97) | (65)
Net Carrying Amount | $ 800 | 809
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 15 years |
Gross Carrying Amount | $ 315 | 315
Accumulated Amortization | (90) | (82)
Net Carrying Amount | $ 225 | 233
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 3 years |
Gross Carrying Amount | $ 209 | 213
Accumulated Amortization | (189) | (184)
Net Carrying Amount | $ 20 | 29
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period (years) | 4 years |
Gross Carrying Amount | $ 168 | 162
Accumulated Amortization | (116) | (101)
Net Carrying Amount | $ 52 | $ 61

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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=26713463&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=26713463&loc=d3e16323-109275 + Details
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