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Retirement and Post-Retirement Benefit Plans - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Oct. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Retirement and post-retirement benefit plans      
Eligible age with 20 years of service 50 years    
EER benefit, minimum   91 days  
ERR benefit, maximum   364 days  
Health care coverage extension period 36 months    
Maximum employer credits $ 12,000    
Restructuring and other charges   $ 257,000,000 $ 53,000,000
Post-Retirement Benefit Plans      
Retirement and post-retirement benefit plans      
Anticipated contributions   6,000,000  
Contributions to benefit plans   1,000,000  
Non-U.S. | Defined Benefit Plans      
Retirement and post-retirement benefit plans      
Anticipated contributions   76,000,000  
Contributions to benefit plans   13,000,000  
U.S. | Non-qualified plan      
Retirement and post-retirement benefit plans      
Anticipated contributions   36,000,000  
Contributions to benefit plans   7,000,000  
Fiscal 2020 Plan | Special Termination Benefits      
Retirement and post-retirement benefit plans      
Restructuring and other charges   $ 44,000,000