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Debt (Schedule of Convertible Senior Subordinated Notes) (Details) - USD ($) $ / shares in Units, $ in Millions | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal amount of debt outstanding | $ 3,520 | $ 786
Unamortized discount & debt issuance costs | (1) | 0
Convertible Senior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Principal amount of debt outstanding | 102 | 102
Unamortized discount & debt issuance costs | 0 | (2)
Net carrying amount | 102 | 100
January 2012 Notes | Convertible Senior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Principal amount of debt outstanding | 42 | 42
Unamortized discount & debt issuance costs | 0 | (2)
Net carrying amount | $ 42 | 40
Coupon rate | 4.00% |
Conversion price per share (in usd per share) | $ 10.21 |
April 2013 Notes | Convertible Senior Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Principal amount of debt outstanding | $ 60 | 60
Unamortized discount & debt issuance costs | 0 | 0
Net carrying amount | $ 60 | $ 60
Coupon rate | 1.25% |
Conversion price per share (in usd per share) | $ 29.19 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: 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 2: 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 3: 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 + Details
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