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Litigation and Environmental Matters (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Loss Contingencies  
Maximum expected cleanup exposure for individual site $ 4
Maximum expected cleanup exposure in aggregate 10
Legal proceedings and environmental exposures  
Loss Contingencies  
Recorded accrual balance for legal proceedings and exposures 105
Legal proceedings and environmental exposures | Minimum  
Loss Contingencies  
Estimation of possible loss 85
Legal proceedings and environmental exposures | Maximum  
Loss Contingencies  
Estimation of possible loss $ 120