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Business Combinations - Acquisition of UDG (Details) € in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2016 EUR (€) | Apr. 01, 2016 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Cash purchase consideration |  |  | $ 4,237 | $ 40 | $ 170
Goodwill |  |  | 10,586 | $ 9,786 | $ 9,817
UDG |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash purchase consideration | € 380 | $ 431 |  |  |
Fair value of assets acquired (excluding goodwill and intangibles) |  |  | 469 |  |
Fair value of liabilities assumed |  |  | 340 |  |
Goodwill |  |  | 181 |  |
Increase in goodwill |  |  | 16 |  |
Customer Relationships | UDG |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquired identifiable intangibles |  |  | $ 120 |  |
Weighted average life |  |  | 10 years |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired, Assets Excluding Goodwill and Intangibles + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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