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Investments (Available-for-Sale Investments With Gross Unrealized Losses) (Details) - USD ($)
$ in Millions
Apr. 28, 2018
Jul. 29, 2017
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value $ 27,407 $ 28,215
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses (488) (195)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 10,894 1,040
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (195) (8)
TOTAL, Fair Value 38,301 29,255
TOTAL, Gross Unrealized Losses (683) (203)
Publicly traded equity securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 41 122
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses (4) (27)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 0 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses 0 0
TOTAL, Fair Value 41 122
TOTAL, Gross Unrealized Losses (4) (27)
Total fixed income securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 27,366 28,093
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses (484) (168)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 10,894 1,040
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (195) (8)
TOTAL, Fair Value 38,260 29,133
TOTAL, Gross Unrealized Losses (679) (176)
Total fixed income securities | U.S. government securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 7,585 14,962
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses (99) (55)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 5,508 771
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (42) (5)
TOTAL, Fair Value 13,093 15,733
TOTAL, Gross Unrealized Losses (141) (60)
Total fixed income securities | U.S. government agency securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 473 1,791
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses (5) (4)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 682 130
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (5) (1)
TOTAL, Fair Value 1,155 1,921
TOTAL, Gross Unrealized Losses (10) (5)
Total fixed income securities | Non-U.S. government and agency securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 110 368
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses 0 (1)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 171 0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (1) 0
TOTAL, Fair Value 281 368
TOTAL, Gross Unrealized Losses (1) (1)
Total fixed income securities | Corporate debt securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 18,094 9,487
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses (348) (92)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 3,706 101
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (106) (1)
TOTAL, Fair Value 21,800 9,588
TOTAL, Gross Unrealized Losses (454) (93)
Total fixed income securities | U.S. agency mortgage-backed securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 1,104 1,485
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses (32) (16)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 827 38
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (41) (1)
TOTAL, Fair Value 1,931 1,523
TOTAL, Gross Unrealized Losses $ (73) $ (17)