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Debt and Financing Activities - Other Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Debt Instrument [Line Items] |  |  |
Future principal payments of long-term debt in 2017 | $ 1,612 |  |
Future principal payments of long-term debt in 2018 | 1,092 |  |
Future principal payments of long-term debt in 2019 | 1,458 |  |
Future principal payments of long-term debt in 2020 | 3 |  |
Future principal payments of long-term debt in 2021 | 2 |  |
Future principal payments of long-term debt, thereafter | 3,980 |  |
Repayments of loan | 1,598 | $ 353 | $ 348
Total debt outstanding | 8,147 | 9,709 |
Floating Rate Notes |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of loan | 400 |  |
Total debt outstanding | 0 | $ 400 |
6.50% Notes Due February 15 2014 |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of loan |  |  | $ 350
Debt interest rate |  |  | 6.50%
0.95% Notes Due December 4 2015 |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of loan | $ 500 |  |
Debt interest rate | 0.95% |  |
3.25% Notes Due March 1 2016 |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of loan | $ 600 |  |
Debt interest rate | 3.25% |  |

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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 Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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