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Comprehensive Income (Loss) (AOCI components) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 26, 2019
Jan. 27, 2018
Jan. 26, 2019
Jan. 27, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance, beginning of period     $ 43,204  
Other comprehensive income (loss) $ 108 $ 52 (93) $ 37
Effect of adoption of accounting standards 3,729 9 3,729 9
Balance, end of period 40,789   40,789  
Net Unrealized Gains (Losses) on Available-for-Sale Investments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance, beginning of period     (310) 373
Other comprehensive income (loss) before reclassifications attributable to Cisco Systems, Inc.     86 (174)
(Gains) losses reclassified out of AOCI     11 (91)
Tax benefit (expense)     0 3
Other comprehensive income (loss)     97 (262)
Effect of adoption of accounting standards (168)   (168)  
Balance, end of period (381) 111 (381) 111
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance, beginning of period     (11) 32
Other comprehensive income (loss) before reclassifications attributable to Cisco Systems, Inc.     (9) 38
(Gains) losses reclassified out of AOCI     (1) (31)
Tax benefit (expense)     2 1
Other comprehensive income (loss)     (8) 8
Effect of adoption of accounting standards 0   0  
Balance, end of period (19) 40 (19) 40
Cumulative Translation Adjustment and Actuarial Gains (Losses)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance, beginning of period     (528) (359)
Other comprehensive income (loss) before reclassifications attributable to Cisco Systems, Inc.     (184) 292
(Gains) losses reclassified out of AOCI     3 5
Tax benefit (expense)     (1) (6)
Other comprehensive income (loss)     (182) 291
Effect of adoption of accounting standards 0   0  
Balance, end of period (710) (68) (710) (68)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance, beginning of period     (849) 46
Other comprehensive income (loss) before reclassifications attributable to Cisco Systems, Inc.     (107) 156
(Gains) losses reclassified out of AOCI     13 (117)
Tax benefit (expense)     1 (2)
Other comprehensive income (loss) 108 52 (93) 37
Effect of adoption of accounting standards (168)   (168)  
Balance, end of period $ (1,110) $ 83 $ (1,110) $ 83