Consolidated Condensed Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020
Statement of Financial Position [Abstract]
Allowance for credit loss	$ 133	$ 122
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	300,000,000	300,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	9,600,000,000	9,600,000,000
Common stock, shares issued (in shares)	1,201,000,000	1,304,000,000
Common stock, shares outstanding (in shares)	1,201,000,000	1,304,000,000