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Business Combinations - Fair Values Recognized of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Apr. 01, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 10,924 | $ 10,586 | $ 9,786
Vantage & Biologics |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Receivables | $ 101 |  |  |
Receivables | (5) |  |  |
Other current assets, net of cash and cash equivalents acquired | 19 |  |  |
Other current assets, net of cash and cash equivalents acquired | 0 |  |  |
Goodwill | 1,132 |  |  |
Goodwill | (87) |  |  |
Intangible assets | 215 |  |  |
Intangible assets | 79 |  |  |
Other long-term assets | 130 |  |  |
Other long-term assets | 54 |  |  |
Current liabilities | (132) |  |  |
Current liabilities | (15) |  |  |
Other long-term liabilities | (169) |  |  |
Other long-term liabilities | (89) |  |  |
Fair value of net assets, less cash and cash equivalents | 1,296 |  |  |
Fair value of net assets, less cash and cash equivalents | (63) |  |  |
Less: Noncontrolling Interests | (89) |  |  |
Less: Noncontrolling Interests | 63 |  |  |
Net assets acquired, net of cash and cash equivalents | 1,207 |  |  |
Net assets acquired, net of cash and cash equivalents | 0 |  |  |
Vantage & Biologics | Amounts Previously Recognized as of Acquisition Date (Provisional) |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Receivables | 106 |  |  |
Other current assets, net of cash and cash equivalents acquired | 19 |  |  |
Goodwill | 1,219 |  |  |
Intangible assets | 136 |  |  |
Other long-term assets | 76 |  |  |
Current liabilities | (117) |  |  |
Other long-term liabilities | (80) |  |  |
Fair value of net assets, less cash and cash equivalents | 1,359 |  |  |
Less: Noncontrolling Interests | (152) |  |  |
Net assets acquired, net of cash and cash equivalents | $ 1,207 |  |  |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, 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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- Definition Amount recognized as of the acquisition date for the assets, including goodwill, in excess of (less than) the aggregate liabilities assumed, less the noncontrolling interest in the acquiree. + 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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