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Retirement Benefit Plans , Change in Benefit Obligation and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 28, 2017 | Apr. 29, 2016 | Apr. 24, 2015 | Apr. 28, 2017 | Apr. 29, 2016
Funded status at end of year: |  |  |  |  |
Underfunded status of the plans |  |  |  | $ (1,300) | $ (1,400)
Amounts recognized on the consolidated balance sheets consist of: |  |  |  |  |
Non-current liabilities |  |  |  | (1,641) | (1,759)
Pension benefits |  |  |  |  |
Change in projected benefit obligation: |  |  |  |  |
Projected benefit obligation at beginning of year | $ 1,535 |  |  |  |
Projected benefit obligation at end of year | 1,734 | $ 1,535 |  |  |
Change in plan assets: |  |  |  |  |
Fair value of plan assets at beginning of year | 1,113 |  |  |  |
Fair value of plan assets at end of year | 1,235 | 1,113 |  |  |
Funded status at end of year: |  |  |  |  |
Fair value of plan assets | 1,113 | 1,113 |  | 1,235 | 1,113
Benefit obligations | 1,535 | 1,535 |  | 1,734 | 1,535
Underfunded status of the plans |  |  |  | (499) | (422)
Recognized liability |  |  |  | (499) | (422)
Amounts recognized on the consolidated balance sheets consist of: |  |  |  |  |
Recognized liability |  |  |  | (499) | (422)
Plans with accumulated benefit obligations in excess of plan assets |  |  |  |  |
Accumulated benefit obligation |  |  |  | 4,188 | 3,922
Projected benefit obligation |  |  |  | 4,677 | 4,333
Plan asset at fair value |  |  |  | 3,454 | 2,981
Plans with projected benefit obligations in excess of plan assets |  |  |  |  |
Projected benefit obligation |  |  |  | 4,903 | 4,362
Plan assets at fair value |  |  |  | 3,646 | 3,009
U.S. Pension Benefits | Pension benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |  |  |
Accumulated benefit obligation at end of year |  |  |  | 2,879 | 2,757
Change in projected benefit obligation: |  |  |  |  |
Projected benefit obligation at beginning of year | 3,048 | 2,956 |  |  |
Service cost | 117 | 120 | $ 104 |  |
Interest cost | 109 | 122 | 105 |  |
Employee contributions | 0 | 0 |  |  |
Plan curtailments and settlements | 0 | (28) |  |  |
Actuarial (gain) loss | (22) | (42) |  |  |
Benefits paid | (80) | (80) |  |  |
Special termination benefits | 60 | 0 |  |  |
Currency exchange rate changes and other | 0 | 0 |  |  |
Projected benefit obligation at end of year | 3,232 | 3,048 | 2,956 |  |
Change in plan assets: |  |  |  |  |
Fair value of plan assets at beginning of year | 2,138 | 2,204 |  |  |
Actual return on plan assets | 238 | (70) |  |  |
Employer contributions | 183 | 112 |  |  |
Employee contributions | 0 | 0 |  |  |
Plan settlements | 0 | (28) |  |  |
Benefits paid | (80) | (80) |  |  |
Currency exchange rate changes and other | 0 | 0 |  |  |
Fair value of plan assets at end of year | 2,479 | 2,138 | 2,204 |  |
Funded status at end of year: |  |  |  |  |
Fair value of plan assets | 2,138 | 2,204 | 2,204 | 2,479 | 2,138
Benefit obligations | 3,048 | 2,956 | 2,956 | 3,232 | 3,048
Underfunded status of the plans |  |  |  | (753) | (910)
Recognized liability |  |  |  | (753) | (910)
Amounts recognized on the consolidated balance sheets consist of: |  |  |  |  |
Non-current assets |  |  |  | 0 | 0
Current liabilities |  |  |  | (13) | (12)
Non-current liabilities |  |  |  | (740) | (898)
Recognized liability |  |  |  | (753) | (910)
Amounts recognized in accumulated other comprehensive loss: |  |  |  |  |
Prior service cost (benefit) |  |  |  | 3 | 4
Net actuarial loss |  |  |  | 1,212 | 1,361
Ending balance |  |  |  | 1,215 | 1,365
Non-U.S. Pension Benefits | Pension benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line items] |  |  |  |  |
Accumulated benefit obligation at end of year |  |  |  | 1,518 | 1,367
Change in projected benefit obligation: |  |  |  |  |
Projected benefit obligation at beginning of year | 1,535 | 1,647 |  |  |
Service cost | 70 | 81 | 60 |  |
Interest cost | 26 | 31 | 33 |  |
Employee contributions | 15 | 16 |  |  |
Plan curtailments and settlements | 6 | (133) |  |  |
Actuarial (gain) loss | 182 | (103) |  |  |
Benefits paid | (43) | (49) |  |  |
Special termination benefits | 0 | 0 |  |  |
Currency exchange rate changes and other | (57) | 45 |  |  |
Projected benefit obligation at end of year | 1,734 | 1,535 | 1,647 |  |
Change in plan assets: |  |  |  |  |
Fair value of plan assets at beginning of year | 1,113 | 1,189 |  |  |
Actual return on plan assets | 109 | (44) |  |  |
Employer contributions | 76 | 93 |  |  |
Employee contributions | 15 | 16 |  |  |
Plan settlements | (1) | (118) |  |  |
Benefits paid | (43) | (49) |  |  |
Currency exchange rate changes and other | (34) | 26 |  |  |
Fair value of plan assets at end of year | 1,235 | 1,113 | 1,189 |  |
Funded status at end of year: |  |  |  |  |
Fair value of plan assets | 1,113 | 1,189 | 1,189 | 1,235 | 1,113
Benefit obligations | $ 1,535 | $ 1,647 | $ 1,647 | 1,734 | 1,535
Recognized liability |  |  |  | (499) | (422)
Amounts recognized on the consolidated balance sheets consist of: |  |  |  |  |
Non-current assets |  |  |  | 5 | 20
Current liabilities |  |  |  | (7) | (8)
Non-current liabilities |  |  |  | (497) | (434)
Recognized liability |  |  |  | (499) | (422)
Amounts recognized in accumulated other comprehensive loss: |  |  |  |  |
Prior service cost (benefit) |  |  |  | (6) | (14)
Net actuarial loss |  |  |  | 450 | 359
Ending balance |  |  |  | $ 444 | $ 345

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + 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 (a)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increases plan assets. + 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan. + 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)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefit obligation for defined benefit plan with benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Fair value of plan assets for defined benefit plan with benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(8) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in benefit obligation for benefits provided to employees payable from defined benefit plan or payable upon retirement. + 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 (a)(10) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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