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Debt and Financing Activities - Long Term Debt (Details) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 EUR (€) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding |  | $ 7,694 | $ 7,880
Term Loan | Euro Dond Due April 2017 |  |  |
Debt Instrument [Line Items] |  |  |
Bond repaid | € | € 500,000,000 |  |
Current Portion of Long-term Debt |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt outstanding |  | $ 1,126 | $ 1,129

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 3: 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 + Details
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