XML 89 R76.htm IDEA: XBRL DOCUMENT v3.10.0.1
Available-for-Sale Debt Investments and Equity Investments (Available-for-Sale Investments With Gross Unrealized Losses) (Details) - USD ($)
$ in Millions
Jan. 26, 2019
Jul. 28, 2018
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value $ 5,902 $ 21,093
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses (61) (391)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 20,220 9,019
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (363) (156)
TOTAL, Fair Value 26,122 30,112
TOTAL, Gross Unrealized Losses (424) (547)
U.S. government securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 6 2,966
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses 0 (20)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 3,437 4,303
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (14) (23)
TOTAL, Fair Value 3,443 7,269
TOTAL, Gross Unrealized Losses (14) (43)
U.S. government agency securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 0 206
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses 0 (2)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 344 521
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (2) (3)
TOTAL, Fair Value 344 727
TOTAL, Gross Unrealized Losses (2) (5)
Non-U.S. government and agency securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 0 105
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses 0 (1)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 115 103
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses 0 0
TOTAL, Fair Value 115 208
TOTAL, Gross Unrealized Losses 0 (1)
Corporate debt securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 5,849 16,990
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses (61) (344)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 15,108 3,511
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (305) (101)
TOTAL, Fair Value 20,957 20,501
TOTAL, Gross Unrealized Losses (366) (445)
U.S. agency mortgage-backed securities    
Schedule of Investments [Line Items]    
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value 47 826
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses 0 (24)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value 1,216 581
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses (42) (29)
TOTAL, Fair Value 1,263 1,407
TOTAL, Gross Unrealized Losses $ (42) $ (53)