Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($)		3 Months Ended
		Jul. 26, 2019	Jul. 27, 2018	Apr. 27, 2019	Apr. 28, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ 50,212,000,000	$ 50,822,000,000
Other comprehensive income (loss)		227,000,000	(584,000,000)
Cumulative effect of change in accounting principle	[1]			$ (33,000,000)
Ending balance		50,497,000,000	50,329,000,000
Unrealized (Loss) Gain on Investment Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(45,000,000)	(194,000,000)
Other comprehensive (loss) income before reclassifications		51,000,000	0
Reclassifications		5,000,000	0
Other comprehensive income (loss)		56,000,000	0
Cumulative effect of change in accounting principle					$ 47,000,000
Ending balance		11,000,000	(147,000,000)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)		(1,000,000)	0
Reclassifications, tax expense (benefit)		(1,000,000)	0
Cumulative Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(1,383,000,000)	(11,000,000)
Other comprehensive (loss) income before reclassifications		66,000,000	(824,000,000)
Reclassifications		0	0
Other comprehensive income (loss)		66,000,000	(824,000,000)
Cumulative effect of change in accounting principle					0
Ending balance		(1,317,000,000)	(835,000,000)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)		0	(5,000,000)
Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(169,000,000)
Other comprehensive (loss) income before reclassifications		99,000,000
Reclassifications		0
Other comprehensive income (loss)		99,000,000
Ending balance		(70,000,000)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)		0
Net Investment Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(257,000,000)
Other comprehensive (loss) income before reclassifications			0
Reclassifications			0
Other comprehensive income (loss)			0
Cumulative effect of change in accounting principle					0
Ending balance			(257,000,000)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)			0
Net Change in Retirement Obligations
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(1,308,000,000)	(1,117,000,000)
Other comprehensive (loss) income before reclassifications		0	0
Reclassifications		13,000,000	27,000,000
Other comprehensive income (loss)		13,000,000	27,000,000
Cumulative effect of change in accounting principle					0
Ending balance		(1,295,000,000)	(1,090,000,000)
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)		0	0
Reclassifications, tax expense (benefit)		(3,000,000)	(5,000,000)
Unrealized Gain (Loss) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		194,000,000
Other comprehensive (loss) income before reclassifications		26,000,000
Reclassifications		(33,000,000)
Other comprehensive income (loss)		(7,000,000)
Ending balance		187,000,000
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)		1,000,000
Reclassifications, tax expense (benefit)		11,000,000
Unrealized (Loss) Gain on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(207,000,000)
Other comprehensive (loss) income before reclassifications			209,000,000
Reclassifications			4,000,000
Other comprehensive income (loss)			213,000,000
Cumulative effect of change in accounting principle					0
Ending balance			6,000,000
Other Comprehensive Income (Loss), Tax [Abstract]
Other comprehensive income (loss) before reclassifications, tax expense (benefit)			60,000,000
Reclassifications, tax expense (benefit)			(1,000,000)
Total Accumulated Other Comprehensive (Loss) Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(2,711,000,000)	(1,786,000,000)
Other comprehensive (loss) income before reclassifications		242,000,000	(615,000,000)
Reclassifications		(15,000,000)	31,000,000
Other comprehensive income (loss)		227,000,000	(584,000,000)
Cumulative effect of change in accounting principle	[2]				$ 47,000,000
Ending balance		$ (2,484,000,000)	$ (2,323,000,000)

[1] See Note 2 to the consolidated financial statements for discussion regarding the adoption of accounting standards during the first quarter fiscal year 2020.

[2] The cumulative effect of change in accounting principle during the first quarter of 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.