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Acquisitions and Dispositions (Details) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended			6 Months Ended
	Dec. 01, 2024 USD ($)	Jan. 09, 2024 USD ($) $ / shares	Sep. 30, 2024 USD ($)	Apr. 30, 2025 USD ($)	Jan. 31, 2025	Apr. 30, 2024 USD ($)	Apr. 30, 2025 USD ($)	Apr. 30, 2024 USD ($)	Oct. 01, 2024 USD ($)	Apr. 02, 2024
Business Acquisition [Line Items]
Proceeds of preferred stock			$ 1,500
Proceeds from sale of a business							$ 210	$ 0
Gain on sale of a business				$ 0		$ 0	$ 244	$ 0
Senior Unsecured Delayed Draw Term Loan Issued September 2024
Business Acquisition [Line Items]
Maximum borrowing capacity under credit facility			12,000
Senior Unsecured Delayed Draw Term Loan Issued September 2024 | Line of Credit
Business Acquisition [Line Items]
Maximum borrowing capacity under credit facility			9,000						$ 1,000
Convertible Preferred Stock
Business Acquisition [Line Items]
Preferred stock dividend rate (as a percentage)				7.625%	7.625%		7.625%
H3C | Amended and Restated Put Share Purchase Agreement
Business Acquisition [Line Items]
Put share purchase agreement, issued capital (as a percent)										0.30
Disposal Group, Disposed of by Sale, Not Discontinued Operations | CTG Business
Business Acquisition [Line Items]
Proceeds from sale of a business	$ 210
Gain on sale of a business	$ 244
Juniper Networks, Inc
Business Acquisition [Line Items]
Business acquisition, share price | $ / shares		$ 40.00
Purchase price consideration		$ 14,000
Loss on contract termination for default		$ 815
Number additional days to close		5 years
Closing date extension, number additional days to close		5 years
Juniper Networks, Inc | Senior Unsecured Delayed Draw Term Loan Issued September 2024 | Line of Credit
Business Acquisition [Line Items]
Repayment amount upon cancellation of acquisition			$ 6,500

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