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Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 30, 2021	Oct. 24, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 41,275	$ 37,920
Other comprehensive income (loss) before reclassifications	(87)	67
(Gains) losses reclassified out of AOCI	(7)	(17)
Tax benefit (expense)	38	22
Ending balance	42,701	38,157
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(417)	(519)
Ending balance	(473)	(447)
Net Unrealized Gains (Losses) on Available-for-Sale Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	182	315
Other comprehensive income (loss) before reclassifications	(111)	(41)
(Gains) losses reclassified out of AOCI	(6)	(15)
Tax benefit (expense)	30	22
Ending balance	95	281
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1)	(6)
Other comprehensive income (loss) before reclassifications	8	(2)
(Gains) losses reclassified out of AOCI	(1)	(2)
Tax benefit (expense)	(1)	1
Ending balance	5	(9)
Cumulative Translation Adjustment and Actuarial Gains (Losses)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(598)	(828)
Other comprehensive income (loss) before reclassifications	16	110
(Gains) losses reclassified out of AOCI	0	0
Tax benefit (expense)	9	(1)
Ending balance	$ (573)	$ (719)

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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