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Fair Value - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 30, 2021
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Financial assets and liabilities measured at fair value on a recurring basis        
Fair value, short- and long-term debt   $ 14,600 $ 17,100  
Carrying value, short- and long-term debt   13,400 15,900  
Goodwill impairment loss     865  
Interest and other, net        
Financial assets and liabilities measured at fair value on a recurring basis        
Recognized gain from equity investments without readily determinable fair value   64 19 $ 13
Level 3        
Financial assets and liabilities measured at fair value on a recurring basis        
Impairment, Lessor Asset under Operating Lease   $ 89 $ 74  
Level 3 | HPC & AI        
Financial assets and liabilities measured at fair value on a recurring basis        
Goodwill impairment loss $ 865