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Debt and Financing Activities - Long Term Debt (Details) £ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Mar. 31, 2015 GBP (£) | Mar. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding | $ 9,200 |  | $ 9,200 |  |  | $ 9,700
Repayment of term loan |  |  | $ 498 | $ 231 |  |
Repayment of floating rate notes | $ 400 |  |  |  |  |
Celesio | Bonds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding |  |  |  |  | £ 60 | 89
Repayment of term loan |  | $ 93 |  |  |  |
Celesio | 4.00% bonds due October 18, 2016 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Euro denominated corporate bonds (as a percent) | 4.00% |  | 4.00% |  |  |
Long-term debt outstanding | $ 400 |  | $ 400 |  |  | 388
Celesio | 4.00% bonds due October 18, 2016 | Bonds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding | $ 980 |  | $ 980 |  |  |
Celesio | 4.50% bonds due April 26, 2017 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Euro denominated corporate bonds (as a percent) | 4.50% |  | 4.50% |  |  |
Long-term debt outstanding | $ 580 |  | $ 580 |  |  | 563
Celesio | 4.50% bonds due April 26, 2017 | Bonds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt outstanding |  |  |  |  |  | $ 951

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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