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Business Combinations - Acquisition of UDG (Details) € in Millions, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 USD ($) | Apr. 01, 2016 EUR (€) | Apr. 01, 2016 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Cash purchase consideration |  |  |  | $ 2,893 | $ 4,237 | $ 40
Goodwill | $ 10,586 |  |  | $ 10,924 | 10,586 | $ 9,786
UDG |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash purchase consideration |  | € 380 | $ 431 |  |  |
Fair value of assets acquired (excluding goodwill and intangibles) | 469 |  |  |  | 469 |
Fair value of liabilities assumed | 340 |  |  |  | 340 |
Goodwill | 181 |  |  |  | 181 |
Increase in goodwill |  |  |  |  | 16 |
Customer relationships | UDG |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired identifiable intangibles | $ 120 |  |  |  | $ 120 |
Weighted average life | 10 years |  |  |  |  |

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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=84161108&loc=d3e4845-128472 + Details
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