Stockholders' Equity, Comprehensive Income and Share-Based Compensation (Details Textual) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended		3 Months Ended	6 Months Ended
	Feb. 28, 2018 USD ($) $ / shares	Dec. 31, 2017 $ / shares	Jan. 28, 2018	Apr. 29, 2018 USD ($) employee_stock_purchase_plan shares	Apr. 30, 2017 USD ($) shares	Sep. 30, 2017 USD ($)
Equity [Line Items]
Amount authorized by board of directors to repurchase shares | $	$ 6,000					$ 3,000
Remaining authorized repurchase amount | $				$ 6,300
Dividends declared per share (in dollars per share) | $ / shares	$ 0.20	$ 0.10
Payments of dividends | $				$ 211	$ 216
Number of employee stock purchase plans | employee_stock_purchase_plan				2
Employee Stock
Equity [Line Items]
Total unrecognized compensation expense | $				$ 447
Weighted average period for unrecognized compensation expense to be recognized (in years)				2 years 8 months 1 day
Performance Shares
Equity [Line Items]
Additional performance-based awards to be earned upon certain levels of achievement (in shares) | shares				1
Award measurement period			3 years
Performance Shares | Min
Equity [Line Items]
Award vesting rights, percentage of target amount			0.00%
Performance Shares | Maximum
Equity [Line Items]
Award vesting rights, percentage of target amount			200.00%
Employee Stock Purchase Plan, United States
Equity [Line Items]
Number of employee stock purchase plans | employee_stock_purchase_plan				1
Employee Stock Purchase Plan, Foreign
Equity [Line Items]
Number of employee stock purchase plans | employee_stock_purchase_plan				1
Employee Stock Incentive Plan | Employee Stock Option
Equity [Line Items]
Number of shares available for grant (in shares) | shares				82
Employee Stock Purchase Plan
Equity [Line Items]
Employee stock purchase plan purchase period				6 months
Shares issued under employee stock purchase plans (in shares) | shares				1	2
Employee Stock Purchase Plan | Employee Stock
Equity [Line Items]
Purchase price of common stock				85.00%
Employee Stock Purchase Plan | Employee Stock Option
Equity [Line Items]
Number of shares available for grant (in shares) | shares				19