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Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Pre-tax effect of derivative instruments in cash flow hedging relationships        
(Loss)/gain recognized in Accumulated other comprehensive loss on derivative $ (21) $ 231 $ (387) $ 291
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded 1,362 826 2,683 1,691
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings (149) 53 (198) 112
Cash flow hedges        
Pre-tax effect of derivative instruments in cash flow hedging relationships        
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded 1,362 826 2,683 1,691
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings (149) 53 (198) 112
Cash flow hedges | Net revenue        
Pre-tax effect of derivative instruments in cash flow hedging relationships        
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded 15,877 12,469 31,523 27,087
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings (146) 62 (189) 123
Cash flow hedges | Cost of revenue        
Pre-tax effect of derivative instruments in cash flow hedging relationships        
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded (12,437) (9,976) (24,759) (21,722)
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings (4) (10) (10) (11)
Cash flow hedges | Other operating expenses        
Pre-tax effect of derivative instruments in cash flow hedging relationships        
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded (2,078) (1,667) (4,081) (3,674)
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings 1 1 1 0
Foreign currency contracts | Cash flow hedges        
Pre-tax effect of derivative instruments in cash flow hedging relationships        
(Loss)/gain recognized in Accumulated other comprehensive loss on derivative (21) 239 (387) 299
Interest rate contracts | Cash flow hedges        
Pre-tax effect of derivative instruments in cash flow hedging relationships        
(Loss)/gain recognized in Accumulated other comprehensive loss on derivative $ 0 $ (8) $ 0 $ (8)