Borrowings - Narrative (Details) - USD ($)		1 Months Ended	12 Months Ended
	Mar. 31, 2023	Jul. 31, 2023	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Debt Instrument [Line Items]
Issuance costs			$ 57,000,000	$ 80,000,000
Discounts on debt issuance			13,000,000
Fair value adjustment related to hedged debt			(58,000,000)	(78,000,000)
Net gain (loss) on debt extinguishment			107,000,000	0	$ (16,000,000)
Commercial paper
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility			6,000,000,000
Borrowings outstanding			0	$ 0
Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility			5,000,000,000
Lines of credit
Debt Instrument [Line Items]
Available borrowing resources			$ 1,200,000,000
U.S. Dollar Global Notes Due June 2026, June 2030 And April 2032
Debt Instrument [Line Items]
Repurchased amount		$ 1,150,000,000
Net gain (loss) on debt extinguishment		$ 115,000,000
$1,000 issued at discount to par at a price of 99.808% at 1.45%, due June 2026
Debt Instrument [Line Items]
Interest rate (percent)		1.45%	1.45%
$850 issued at discount to par at a price of 99.790% at 3.4%, due June 2030
Debt Instrument [Line Items]
Interest rate (percent)		3.40%	3.40%
$1,000 issued at discount to par at a price of 99.966% at 4.20%, due April 2032
Debt Instrument [Line Items]
Interest rate (percent)			4.20%
$500 issued at par at a price of 100% at 4.75%, due March 2029
Debt Instrument [Line Items]
Repurchased amount			$ 497,000,000
Interest rate (percent)			4.75%
Net gain (loss) on debt extinguishment			$ (8,000,000)
364-Day Revolving Credit Facility | Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	$ 1,000,000,000
Revolving credit facility, term	364 days