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Income Taxes Schedule of Unrecognized Tax Benefit (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 31, 2016
Nov. 04, 2018
Oct. 29, 2017
Oct. 30, 2016
Income Tax Disclosure [Abstract]        
Beginning of period $ 578 $ 2,256 $ 1,983 $ 578
Lapse of statute of limitations   20 12 8
Increases in balances related to tax positions taken during prior periods (including those related to acquisitions made during the year)   361 47 1,325
Decreases in balances related to tax positions taken during prior periods   (289) (32) (1)
Increases in balances related to tax positions taken during current period   1,726 391 138
Decreases in balances related to settlement with taxing authorities   4 121 49
End of period   4,030 2,256 $ 1,983
Unrecognized Tax Benefits, Period Increase (Decrease) $ 1,405 $ 1,774 $ 273