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Goodwill And Intangible Assets, Net (Information Regarding Intangible Assets) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015
Intangible assets |  |
Gross carrying amount | $ 5,317 | $ 5,204
Accumulated amortization | (1,891) | (1,763)
Net carrying amount | $ 3,426 | 3,441
Customer lists |  |
Intangible assets |  |
Weighted average remaining amortization period (years) | 9 years |
Gross carrying amount | $ 2,717 | 2,683
Accumulated amortization | (1,190) | (1,116)
Net carrying amount | $ 1,527 | 1,567
Service agreements |  |
Intangible assets |  |
Weighted average remaining amortization period (years) | 15 years |
Gross carrying amount | $ 964 | 957
Accumulated amortization | (230) | (215)
Net carrying amount | $ 734 | 742
Pharmacy licenses |  |
Intangible assets |  |
Weighted average remaining amortization period (years) | 26 years |
Gross carrying amount | $ 926 | 874
Accumulated amortization | (83) | (65)
Net carrying amount | $ 843 | 809
Trademarks and trade names |  |
Intangible assets |  |
Weighted average remaining amortization period (years) | 15 years |
Gross carrying amount | $ 325 | 315
Accumulated amortization | (87) | (82)
Net carrying amount | $ 238 | 233
Technology-based intangible assets |  |
Intangible assets |  |
Weighted average remaining amortization period (years) | 3 years |
Gross carrying amount | $ 210 | 213
Accumulated amortization | (187) | (184)
Net carrying amount | $ 23 | 29
Other |  |
Intangible assets |  |
Weighted average remaining amortization period (years) | 4 years |
Gross carrying amount | $ 175 | 162
Accumulated amortization | (114) | (101)
Net carrying amount | $ 61 | $ 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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- Definition Amount after 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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