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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Jul. 27, 2019
Statement of Comprehensive Income [Abstract]      
Net income $ 10,591 $ 11,214 $ 11,621
Available-for-sale investments:      
Change in net unrealized gains and losses, net of tax benefit (expense) of $46, $(84), and $(101) for fiscal 2021, 2020, and 2019, respectively (95) 336 459
Net (gains) losses reclassified into earnings, net of tax expense (benefit) of $15, $21, and $6 for fiscal 2021, 2020, and 2019, respectively (38) (21) 19
Total available-for-sale investments (133) 315 478
Cash flow hedging instruments:      
Change in unrealized gains and losses, net of tax benefit (expense) of $(4), $0, and $0 for fiscal 2021, 2020, and 2019, respectively 16 7  
Change in unrealized gains and losses, net of tax benefit (expense) of $(4), $0, and $0 for fiscal 2021, 2020, and 2019, respectively     0
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $3, $0, and $0 for fiscal 2021, 2020, and 2019, respectively (11) 1  
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $3, $0, and $0 for fiscal 2021, 2020, and 2019, respectively     (3)
Total cash flow hedging instruments 5 8  
Total cash flow hedging instruments     (3)
Net change in cumulative translation adjustment and actuarial gains and losses, net of tax benefit (expense) of $(2), $(5), and $15 for fiscal 2021, 2020, and 2019, respectively 230 (50) (250)
Other comprehensive income (loss) 102 273 225
Comprehensive income $ 10,693 $ 11,487 $ 11,846