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Commitments and Contingent Liabilities - Environmental Matters (Narrative) (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
site
Mar. 31, 2026
USD ($)
site
Loss Contingencies [Line Items]    
Number of hazardous Substance Sites, designation as PRP | site   12
Environmental Litigation    
Loss Contingencies [Line Items]    
Number of hazardous substance sites, recipient of directives | site 1  
Estimated environmental assessment and cleanup costs $ 1,400  
Environmental Litigation | New Jersey    
Loss Contingencies [Line Items]    
Estimated loss   $ 3
Environmental Litigation | All Sites Excluding New Jersey    
Loss Contingencies [Line Items]    
Estimated loss   $ 27
Hazardous substance sites | site   11
Claims And Demands From Government Agencies, Environmental Conditions    
Loss Contingencies [Line Items]    
Environmental loss contingency, agreed remediation, number of sites | site   4
Loss contingency, estimate of possible loss   $ 28
Estimated loss   $ 28
Environmental Loss Contingency Statement Of Financial Position Extensible Enumeration Not Disclosed Flag   Consolidated Balance Sheet