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Retirement Benefit Plans , Additional Information (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Apr. 28, 2017 USD ($) | Apr. 29, 2016 USD ($) | Apr. 24, 2015 USD ($) | May 01, 2005 plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Cost of retirement benefit plans | $ 602 | $ 584 | $ 433 |
Underfunded status of the plan | (1,300) | (1,400) |  |
Special termination benefits | 73 |  |  |
Special termination benefits, defined contribution plan | 4 |  |  |
Cash payments and administrative fees | 2 |  |  |
Real estate investment to be liquidated | 1 |  |  |
Expense under defined contribution plans | $ 347 | 269 | 188 |
Treasury bond rate of guaranteed rate of return | 10 years |  |  |
Partnerships | Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Range of notice period | 45 days |  |  |
Partnerships | Maximum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Range of notice period | 95 days |  |  |
Absolute return strategy funds |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Absolute return strategy funds in process of liquidation, fair value | $ 2 |  |  |
Private equity fund |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Private equity funds, unfunded commitments | $ 158 |  |  |
Private equity funds, estimated minimum liquidation period | 1 year |  |  |
Private equity funds, estimated maximum liquidation period | 15 years |  |  |
Real asset investments | Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Real asset investments, estimated liquidation and redemption period | 30 days |  |  |
Real asset investments | Maximum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Real asset investments, estimated liquidation and redemption period | 10 years |  |  |
Personal Pension Account |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expense under defined contribution plans | $ 58 | 58 | 53 |
Medtronic Core Contribution |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Expense under defined contribution plans | 45 | 12 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Patient Care, Deep Vein Thrombosis, and Nutritional Insufficiency Business |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Disposal group, pension and post-retirement benefit liabilities | 12 |  |  |
Disposal group, pension benefit liabilities | 9 |  |  |
Disposal group, post-retirement benefit liabilities | $ 3 |  |  |
U.S. Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocations | 100.00% |  |  |
Number of new plans created | plan |  |  |  | 2
U.S. Pension Benefits | Equity |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocations | 40.00% |  |  |
U.S. Pension Benefits | Debt |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocations | 36.00% |  |  |
U.S. Pension Benefits | Other |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocations | 24.00% |  |  |
Pension benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Underfunded status of the plan | $ (499) | (422) |  |
Estimated future employer contributions in next fiscal year | 302 |  |  |
Post-retirement benefit plans, benefit obligations | 1,734 | 1,535 |  |
Post-retirement benefit plans, fair value of plan assets | 1,235 | 1,113 |  |
Pension benefits | U.S. Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Underfunded status of the plan | (753) | (910) |  |
Special termination benefits, defined benefit plan | 60 | 0 | 0 |
Defined benefit plan, future amortization of net actuarial loss | 83 |  |  |
Employer contributions | 183 | 112 |  |
Post-retirement benefit plans, net periodic benefit cost | 180 | 159 | 114 |
Post-retirement benefit plans, benefit obligations | 3,232 | 3,048 | 2,956 |
Post-retirement benefit plans, fair value of plan assets | 2,479 | 2,138 | 2,204 |
Pension benefits | Non-U.S. Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Special termination benefits, defined benefit plan | 0 | 0 | 0 |
Defined benefit plan, future amortization of net actuarial loss | 17 |  |  |
Employer contributions | 76 | 93 |  |
Post-retirement benefit plans, net periodic benefit cost | 64 | 74 | 64 |
Post-retirement benefit plans, benefit obligations | 1,734 | 1,535 | 1,647 |
Post-retirement benefit plans, fair value of plan assets | $ 1,235 | 1,113 | 1,189 |
Pension benefits | Non-U.S. Pension Benefits | Equity |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocations | 37.00% |  |  |
Pension benefits | Non-U.S. Pension Benefits | Debt |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocations | 29.00% |  |  |
Pension benefits | Non-U.S. Pension Benefits | Other |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Target allocations | 34.00% |  |  |
Other post-retirement benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Post-retirement benefit plans, net periodic benefit cost | $ 11 | 12 | $ 14 |
Post-retirement benefit plans, benefit obligations | 323 | 369 |  |
Post-retirement benefit plans, fair value of plan assets | 289 | $ 269 |  |
Other post-retirement benefits | U.S. Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |
Special termination benefits, defined benefit plan | $ 7 |  |  |

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- Definition Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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