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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net earnings (loss) $ 3,427 $ (322) $ 1,049
Change in net unrealized gains (losses) on available-for-sale securities:      
Net unrealized gains (losses) arising during the period (3) (1) 9
(Gains) losses reclassified into earnings 0 (4) (3)
Change in unrealized gains (losses) on available-for-sale securities (3) (5) 6
Change in net unrealized gains (losses) on cash flow hedges:      
Net unrealized gains (losses) arising during the period (50) (40) 308
Net unrealized gains (losses) arising during the period 156 (21) (371)
Change in unrealized (losses) gains on cash flow hedges 106 (61) (63)
Change in unrealized components of defined benefit plans:      
Net unrealized gains (losses) arising during the period 763 (358) (701)
Amortization of net actuarial loss and prior service benefit 281 249 216
Curtailments, settlements and other 4 10 15
Change in unrealized components of defined benefit plans 1,048 (99) (470)
Change in cumulative translation adjustment 16 (12) (18)
Other comprehensive income (loss) before taxes 1,167 (177) (545)
(Provision) benefit for taxes (143) 8 36
Other comprehensive income (loss), net of taxes 1,024 (169) (509)
Comprehensive income (loss) $ 4,451 $ (491) $ 540