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Retirement and Post-Retirement Benefit Plans - Summary of Net Benefit Cost (Details) - Benefit Plans - Non-U.S. Defined Benefit Plans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 27 $ 30 $ 53 $ 70
Interest cost 58 52 113 102
Expected return on plan assets (145) (131) (284) (264)
Amortization and deferrals:        
Actuarial loss 54 64 106 140
Prior service benefit (4) (4) (8) (8)
Net periodic benefit (credit) cost (10) 11 (20) 40
Settlement loss 2 3 2 3
Special termination benefits 2 1 4 2
Plan expense allocation 0 (4) 0 (16)
Net benefit (credit) cost from continuing operations (6) 11 (14) 29
Discontinued operations 0 34 0 80
Net benefit (credit) cost $ (6) $ 45 $ (14) $ 109