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Accumulated Other Comprehensive Loss (Details) - USD ($) | 12 Months Ended
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Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | $ 50,212,000,000 |  | $ 50,822,000,000 |  | $ 50,330,000,000 |
Other comprehensive (loss) income | (851,000,000) |  | (975,000,000) |  | 1,030,000,000 |
Ending balance | 50,872,000,000 |  | 50,212,000,000 |  | 50,822,000,000 |
Cumulative effect of change in accounting principle |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (33,000,000) | [1] | 0 | [2] | 296,000,000 | [3]
Ending balance |  |  | (33,000,000) | [1] | 0 | [2]
Total Accumulated Other Comprehensive (Loss) Income |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (2,711,000,000) |  | (1,786,000,000) |  | (2,613,000,000) |
Other comprehensive income (loss) before reclassifications | (666,000,000) |  | (1,026,000,000) |  | 951,000,000 |
Reclassifications | (183,000,000) |  | 54,000,000 |  | 79,000,000 |
Other comprehensive (loss) income | (849,000,000) |  | (972,000,000) |  | 1,030,000,000 |
Ending balance | (3,560,000,000) |  | (2,711,000,000) |  | (1,786,000,000) |
Total Accumulated Other Comprehensive (Loss) Income | Cumulative effect of change in accounting principle |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | 0 | [1] | 47,000,000 | [2] | (203,000,000) | [3]
Ending balance |  |  | 0 | [1] | 47,000,000 | [2]
Unrealized (Loss) Gain on Investment Securities |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (45,000,000) |  | (194,000,000) |  | (69,000,000) |
Other comprehensive income (loss) before reclassifications | 43,000,000 |  | 67,000,000 |  | (95,000,000) |
Reclassifications | 2,000,000 |  | 35,000,000 |  | (8,000,000) |
Other comprehensive (loss) income | 45,000,000 |  | 102,000,000 |  | (103,000,000) |
Ending balance | 0 |  | (45,000,000) |  | (194,000,000) |
Other comprehensive income (loss), tax expense (benefit) | (13,000,000) |  | (5,000,000) |  | 26,000,000 |
Reclassifications from AOCI, tax expense (benefit) | (3,000,000) |  | (3,000,000) |  | 4,000,000 |
Unrealized (Loss) Gain on Investment Securities | Cumulative effect of change in accounting principle |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 47,000,000 |  | (22,000,000) |
Ending balance |  |  |  |  | 47,000,000 |
Cumulative Translation Adjustments |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (1,383,000,000) |  | (11,000,000) |  | (1,195,000,000) |
Other comprehensive income (loss) before reclassifications | (827,000,000) |  | (1,372,000,000) |  | 1,218,000,000 |
Reclassifications | 0 |  | 0 |  | (34,000,000) |
Other comprehensive (loss) income | (827,000,000) |  | (1,372,000,000) |  | 1,184,000,000 |
Ending balance | (2,210,000,000) |  | (1,383,000,000) |  | (11,000,000) |
Other comprehensive income (loss), tax expense (benefit) | (9,000,000) |  | (7,000,000) |  |  |
Cumulative Translation Adjustments | Cumulative effect of change in accounting principle |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 0 |  | 0 |
Ending balance |  |  |  |  | 0 |
Net Investment Hedges |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (169,000,000) |  | (257,000,000) |  | (257,000,000) |
Other comprehensive income (loss) before reclassifications |  |  | 88,000,000 |  | 0 |
Reclassifications |  |  | 0 |  | 0 |
Other comprehensive (loss) income |  |  | 88,000,000 |  | 0 |
Ending balance |  |  | (169,000,000) |  | (257,000,000) |
Other comprehensive income (loss), tax expense (benefit) |  |  | 0 |  | 0 |
Net Investment Hedges | Cumulative effect of change in accounting principle |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 0 |  | 0 |
Ending balance |  |  |  |  | 0 |
Net Investment Hedges |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications | 405,000,000 |  |  |  |  |
Reclassifications | 0 |  |  |  |  |
Other comprehensive (loss) income | 405,000,000 |  |  |  |  |
Ending balance | 236,000,000 |  |  |  |  |
Other comprehensive income (loss), tax expense (benefit) | 0 |  |  |  |  |
Net Change in Retirement Obligations |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | (1,308,000,000) |  | (1,117,000,000) |  | (1,129,000,000) |
Other comprehensive income (loss) before reclassifications | (596,000,000) |  | (266,000,000) |  | 100,000,000 |
Reclassifications | 52,000,000 |  | 75,000,000 |  | 67,000,000 |
Other comprehensive (loss) income | (544,000,000) |  | (191,000,000) |  | 167,000,000 |
Ending balance | (1,852,000,000) |  | (1,308,000,000) |  | (1,117,000,000) |
Other comprehensive income (loss), tax expense (benefit) | (159,000,000) |  | (63,000,000) |  | 14,000,000 |
Reclassifications from AOCI, tax expense (benefit) | (12,000,000) |  | (19,000,000) |  | (27,000,000) |
Net Change in Retirement Obligations | Cumulative effect of change in accounting principle |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | 0 |  | (155,000,000) |
Ending balance |  |  |  |  | 0 |
Unrealized Gain (Loss) on Cash Flow Hedges |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance | 194,000,000 |  | (207,000,000) |  | 37,000,000 |
Other comprehensive income (loss) before reclassifications | 309,000,000 |  | 457,000,000 |  | (272,000,000) |
Reclassifications | (237,000,000) |  | (56,000,000) |  | 54,000,000 |
Other comprehensive (loss) income | 72,000,000 |  | 401,000,000 |  | (218,000,000) |
Ending balance | 266,000,000 |  | 194,000,000 |  | (207,000,000) |
Other comprehensive income (loss), tax expense (benefit) | 88,000,000 |  | 158,000,000 |  | (132,000,000) |
Reclassifications from AOCI, tax expense (benefit) | $ 80,000,000 |  | 24,000,000 |  | (22,000,000) |
Unrealized Gain (Loss) on Cash Flow Hedges | Cumulative effect of change in accounting principle |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | $ 0 |  | (26,000,000) |
Ending balance |  |  |  |  | $ 0 |
[1] | See Note 1 to the consolidated financial statements for discussion regarding the adoption of accounting standards during fiscal year 2020.
[2] | The cumulative effect of change in accounting principle in fiscal year 2019 resulted from the adoption of accounting guidance that requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. As a result of the adoption, the Company reclassified $47 million from accumulated other comprehensive loss to the opening balance of retained earnings as of April 28, 2018.
[3] | The cumulative effect of change in accounting principle in fiscal year 2018 resulted from the adoption of accounting guidance that requires the tax effect of intra-entity transactions, other than sales of inventory, to be recognized when the transaction occurs, and accounting guidance which permitted reclassification of stranded tax effects resulting from the enactment of comprehensive U.S. tax legislation from accumulated other comprehensive loss to retained earnings.

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