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Acquisitions and Acquisition-Related Items - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 02, 2015 USD ($) | Aug. 31, 2015 USD ($) | Aug. 11, 2015 USD ($) | Jan. 26, 2015 USD ($) $ / shares | Jan. 29, 2016 USD ($) | Jan. 23, 2015 USD ($) | Jan. 29, 2016 USD ($) | Jan. 23, 2015 USD ($) | Oct. 30, 2015 USD ($) | Apr. 24, 2015 USD ($) | Oct. 24, 2014 USD ($) | Apr. 25, 2014 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 40,376 |  | $ 40,376 |  |  | $ 40,530 |  |
Acquisition-related items |  |  |  |  | 63 | $ 80 | 183 | $ 182 |  |  |  |
Fair value of contingent consideration |  |  |  |  | 371 | $ 93 | 371 | $ 93 | $ 368 | 264 | $ 91 | $ 68
Other long-term liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration |  |  |  |  | 311 |  | 311 |  |  | 242 |  |
Other accrued expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent consideration |  |  |  |  | 60 |  | 60 |  |  | $ 22 |  |
Covidien plc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration per Covidien share (usd per share) | $ / shares |  |  |  | $ 35.19 |  |  |  |  |  |  |  |
Consideration - number of shares issued for each Covidien share, conversion ratio |  |  |  | 0.956 |  |  |  |  |  |  |  |
Consideration - total |  |  |  | $ 50,000 |  |  |  |  |  |  |  |
Consideration - cash |  |  |  | 16,000 |  |  |  |  |  |  |  |
Consideration - non-cash |  |  |  | 34,000 |  |  |  |  |  |  |  |
Percentage ownership by Medtronic shareholders subsequent to acquisition |  |  |  |  |  | 69.00% |  | 69.00% |  |  |  |
Percentage ownership by Covidien shareholders subsequent to acquisition |  |  |  |  |  | 31.00% |  | 31.00% |  |  |  |
Goodwill |  |  |  | 29,979 |  |  |  |  |  |  |  |
Contingent liabilities assumed |  |  |  | 2,700 |  |  |  |  |  |  |  |
Covidien plc [Member] | Contingent Liability, Income Tax [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent liabilities assumed |  |  |  | 1,500 |  |  |  |  |  |  |  |
Covidien plc [Member] | Contingent Liability, Legal [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contingent liabilities assumed |  |  |  | 1,200 |  |  |  |  |  |  |  |
Covidien plc [Member] | IPR&D [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
IPR&D |  |  |  | 400 |  |  |  |  |  |  |  |
Covidien plc [Member] | Customer-related [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  | $ 18,300 |  |  |  |  |  |  |  |
Finite-lived intangible assets, useful life |  |  |  | 18 years |  |  |  |  |  |  |  |
Covidien plc [Member] | Technology-Based Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  | $ 7,100 |  |  |  |  |  |  |  |
Finite-lived intangible assets, useful life |  |  |  | 16 years |  |  |  |  |  |  |  |
Covidien plc [Member] | Tradenames [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  |  | $ 400 |  |  |  |  |  |  |  |
Finite-lived intangible assets, useful life |  |  |  | 6 years |  |  |  |  |  |  |  |
Twelve, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration - total | $ 472 |  |  |  |  |  |  |  |  |  |  |
Consideration - cash | 428 |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets | 0 |  |  |  |  |  |  |  |  |  |  |
IPR&D | 192 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 301 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ 44 |  |  |  |  |  |  |  |  |  |  |
RF Surgical Systems, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration - total |  |  | $ 240 |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  | 115 |  |  |  |  |  |  |  |  |
IPR&D |  |  | 0 |  |  |  |  |  |  |  |  |
Goodwill |  |  | 132 |  |  |  |  |  |  |  |  |
RF Surgical Systems, Inc. [Member] | Customer-related [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  | $ 47 |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, useful life |  |  | 16 years |  |  |  |  |  |  |  |  |
RF Surgical Systems, Inc. [Member] | Technology-Based Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  |  | $ 68 |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, useful life |  |  | 18 years |  |  |  |  |  |  |  |  |
Medina Medical [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration - total |  | $ 195 |  |  |  |  |  |  |  |  |  |
Consideration - cash |  | 155 |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets |  | 0 |  |  |  |  |  |  |  |  |  |
IPR&D |  | 122 |  |  |  |  |  |  |  |  |  |
Goodwill |  | 126 |  |  |  |  |  |  |  |  |  |
Contingent consideration |  | 64 |  |  |  |  |  |  |  |  |  |
Consideration - total, including equity interest in acquiree held prior to combination |  | $ 219 |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree held prior to acquisition |  | 11.00% |  |  |  |  |  |  |  |  |  |
Business combinations or purchases of intellectual property prior to April 24, 2009 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of future contingent consideration payments |  |  |  |  | $ 177 |  | $ 177 |  |  |  |  |

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