Accumulated Other Comprehensive Loss (Details) - USD ($)	12 Months Ended
	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.