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Fair Value Measurements (Details Textual) - USD ($)	Jan. 27, 2019	Oct. 29, 2018	Oct. 28, 2018	Jan. 28, 2018
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Retained earnings	$ 23,032,000,000		$ 20,880,000,000
Fair value of transfers from level one to level two	0			$ 0
Fair value of transfers from level two to level one	0			$ 0
Investment securities	2,108,000,000		2,158,000,000
Long-term debt, principal amount	5,400,000,000		5,400,000,000
Recurring fair value measurements \| Level 3
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Investment securities	0		0
Estimated fair value \| Level 2
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Long-term debt fair value	$ 5,500,000,000		$ 5,400,000,000
Accounting Standards Update 2016-01
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Retained earnings		$ 21,000,000