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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Statement of Comprehensive Income [Abstract]        
Net (loss) earnings $ (821) $ 419 $ (488) $ 596
Change in net unrealized (losses) gains on available-for-sale securities:        
Net unrealized (losses) gains arising during the period (8) 3 (6) 5
(Gains) losses reclassified into earnings (4) 0 (7) (3)
Change in net unrealized gains (losses) on available-for-sale securities (12) 3 (13) 2
Change in net unrealized gains (losses) on cash flow hedges:        
Net unrealized gains (losses) arising during the period 296 128 371 162
Net (gains) losses reclassified into earnings (214) (68) (283) (201)
Change in net unrealized gains (losses) on cash flow hedges 82 60 88 (39)
Change in unrealized components of defined benefit plans:        
Net unrealized (losses) gains arising during the period (8) 8 9 (47)
Amortization of net actuarial loss and prior service benefit 61 55 122 107
Curtailments, settlements and other 1 2 1 7
Change in unrealized components of defined benefit plans 54 65 132 67
Change in cumulative translation adjustment (43) (6) (47) 6
Other comprehensive income before taxes 81 122 160 36
(Provision) benefit for taxes (6) (8) (15) 2
Other comprehensive income, net of taxes 75 114 145 38
Comprehensive (loss) income $ (746) $ 533 $ (343) $ 634