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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 27, 2018
Jan. 28, 2017
Jan. 27, 2018
Jan. 28, 2017
Statement of Comprehensive Income [Abstract]        
Change in net unrealized gains, tax benefit (expense) $ 1 $ 73 $ (22) $ 154
Net (gains) losses reclassified into earnings, tax expense (benefit) 15 (11) 25 (6)
Change in unrealized gains and losses, tax benefit (expense) (2) 1 (3) 4
Net (gains) losses reclassified into earnings, tax expense (benefit) 2 (2) 4 (3)
Net change in cumulative translation adjustment and actuarial gains and losses, tax benefit (expense) $ (4) $ 0 $ (6) $ (1)