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Contingencies, Commitments and Guarantees (Contingencies - Narrative) (Details)
$ in Millions
9 Months Ended 12 Months Ended
Jul. 29, 2019
USD ($)
Sep. 30, 2019
USD ($)
Claims
Sep. 30, 2018
Claims
Dec. 31, 2018
Claims
Loss Contingencies        
Maximum estimate of aggregate costs to resolve matter $ 80      
Minimum        
Loss Contingencies        
Loss Contingency, Range of Possible Loss, Portion Not Accrued   $ 0    
Maximum        
Loss Contingencies        
Loss Contingency, Range of Possible Loss, Portion Not Accrued   $ 275    
Asbestos Related Claims        
Loss Contingencies        
Asbestos-Related Claims | Claims   2,493 2,558 3,359